Concentration method and system for sectional purification of isopropanol waste liquid

Abstract

The invention relates to the technical field of water treatment engineering, and particularly discloses a sectional purification isopropanol waste liquid concentration method and system.The system comprises a raw water storage tank, the raw water storage tank is connected with a security filter, a booster pump is arranged on a pipeline between the security filter and the raw water storage tank, the security filter is connected with a first membrane filtration assembly, and the first membrane filtration assembly is connected with a second membrane filtration assembly; a first high-pressure pump is arranged on the pipeline between the membrane filtration assembly I and the security filter, a produced water outlet of the membrane filtration assembly I is connected with a cooling produced water tank, a concentrated water outlet of the membrane filtration assembly I is connected with a temporary storage tank, and a circulating pump is arranged on the pipeline between the raw water storage tank and the temporary storage tank; the temporary storage box is connected with a second membrane filtering assembly, and a second high-pressure pump is arranged on a pipeline between the second membrane filtering assembly and the temporary storage box; cooling assemblies are connected to the raw water storage tank and the temporary storage tank in a penetrating manner. The device has the characteristics of high integration degree and small occupied area.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment engineering, and in particular to a segmented purification and concentration method and system for isopropanol waste liquid. Background Art

[0002] Currently in the semiconductor industry, electronic-grade isopropyl alcohol is an indispensable wet electronic chemical and one of the key auxiliary materials. It is mainly used for wafer surface cleaning and packaging testing. Judging from the current demand for isopropyl alcohol, the higher the purity of the isopropyl alcohol solution, the greater the market demand. At the same time, the purification technology has also ushered in greater challenges.

[0003] Conventionally, when concentrating an isopropyl alcohol solution, the isopropyl alcohol is usually filtered through a filter membrane or other filter material to filter out water from the isopropyl alcohol solution and increase the concentration of the isopropyl alcohol solution. When concentrating an isopropyl alcohol solution, the concentration of the isopropyl alcohol solution discharged at the end is often increased by multi-stage filtration, which requires the preparation of multiple filtration systems. The multiple filtration systems are independent of each other, have a low degree of integration, and occupy a large area, so further improvements can be made.

[0004] The patent document with the publication number of "CN102039368A" discloses a method for recovering isopropanol from chemical wastewater for preparing alcohol-based casting coatings. The isopropanol used to prepare the alcohol-based casting coatings is extracted from chemical wastewater with an isopropanol content of less than 10%. The preparation method includes pretreatment, membrane separation, extraction distillation and preparation of alcohol-based casting coatings. The method filters the chemical wastewater through quartz sand and melt-blown filter element and concentrates it through membrane separation, and then uses extraction distillation to obtain isopropanol with a content greater than 95%, and uses this as a raw material for producing alcohol-based casting coatings. The isopropanol in the chemical wastewater is recycled and reused to turn waste into treasure, which has the characteristics of low cost, energy saving and environmental protection, and simple process. It is not only conducive to energy saving and emission reduction of chemical wastewater, but also can bring good economic benefits to enterprises, and has high promotion and use value. The processing system in this method has the problem of low integration and large floor space.

[0005] Therefore, the existing recovery and treatment of isopropyl alcohol in industrial wastewater has the problems of low integration and large floor space. Summary of the invention

[0006] In order to solve the above technical problems existing in the recovery and treatment of isopropanol in existing industrial wastewater, the present invention provides a segmented purification and concentration method and system for isopropanol waste liquid with a high degree of integration and a small footprint.

[0007] The first technical solution of the present invention: a staged purification and concentration system for isopropanol waste liquid, comprising a raw water storage tank, the raw water storage tank is connected to a security filter through a pipeline, a booster pump is provided on the pipeline between the security filter and the raw water storage tank, the security filter is connected to a membrane filter component 1 through a pipeline, a first high-pressure pump is provided on the pipeline between the membrane filter component 1 and the security filter, the produced water outlet of the membrane filter component 1 is connected to a cooling produced water tank through a pipeline, the concentrated water outlet of the membrane filter component 1 is connected to a temporary storage box through a pipeline, the temporary storage box is connected to the raw water storage tank through a pipeline, and a circulating pump is provided on the pipeline between the raw water storage tank and the temporary storage box; the temporary storage box is connected to a membrane filter component 2 through a pipeline, a second high-pressure pump is provided on the pipeline between the membrane filter component 2 and the temporary storage box, the produced water outlet of the membrane filter component 2 is connected to the cooling produced water tank through a pipeline, and the concentrated water outlet of the membrane filter component 2 is connected to the raw water storage tank through a pipeline; the raw water storage tank and the temporary storage box are both connected with cooling components.The raw water storage tank in the present invention is used to contain isopropanol waste liquid to be treated. Through continuous circulation treatment, the concentration is gradually increased. The real-time monitoring of the isopropanol concentration in the raw water storage tank can be derived into isopropanol solutions of different concentrations for corresponding use as needed; the security filter can effectively remove particulate impurities in the isopropanol waste liquid to avoid affecting the good operation of the subsequent membrane filtration component 1 and the first high-pressure pump; the booster pump can effectively promote the isopropanol waste liquid in the raw water storage tank to pass through the security filter; the membrane filtration component 1 can effectively concentrate the isopropanol waste liquid for a period of time. The initial concentration of the isopropanol waste liquid is 1% to 8%. After passing through the membrane filtration component 1, an isopropanol waste liquid with a concentration of 10% to 15% will be generated. alcohol concentrate; the first high-pressure pump can effectively promote the isopropanol waste liquid to achieve the concentration effect through the membrane filtration component one; the cooling water production tank is used to collect the concentrated qualified water; the temporary storage tank is used to collect the isopropanol concentrate after the first stage of concentration, and provide consideration and buffer for the subsequent second-stage concentration or returning to the raw water storage tank to continue the first stage of concentration; if the isopropanol concentrate after the first stage of concentration needs to be returned to the raw water storage tank to continue the first stage of concentration, the circulation pump can provide good power; the membrane filtration component two in the present invention can effectively continue the second-stage concentration of the isopropanol concentrate in the temporary storage tank, and after passing through the membrane filtration component two, an isopropanol concentrate with a concentration of more than 18% to 22% will be produced; the second high-pressure pump can effectively The invention can well promote the first-stage isopropyl alcohol concentrate to pass through the membrane filtration component 2 to achieve a good second-stage concentration effect; the qualified water passing through the membrane filtration component 2 will continue to be collected in the cooling water production tank, and the second-stage isopropyl alcohol concentrate after interception will be returned to the raw water storage tank for export or continue to be fully purified in the first and / or second stages; the cooling component can well cool the solution in the raw water storage tank and the temporary storage tank, so that the temperature of the entire system is relatively constant at room temperature, avoiding the danger of explosion caused by the volatilized isopropyl alcohol gas due to excessive temperature; the present invention circulates the isopropyl alcohol solution in the primary membrane filtration system, continuously concentrates the isopropyl alcohol solution, and the concentrated isopropyl alcohol solution is temporarily stored in the temporary storage tank, and then is purified by the second high-pressure pump The isopropyl alcohol solution is transported to the second membrane filtration component for further concentration, thereby achieving the purpose of segmented concentration of the isopropyl alcohol solution; the primary membrane filtration system and the secondary membrane filtration system are integrated as a whole, with a high degree of integration and a small footprint; two isopropyl alcohol concentrates of different concentrations can be obtained through the primary membrane filtration system and the secondary membrane filtration system, respectively. Due to the different concentrations, they can be recycled or used as industrial-grade isopropyl alcohol feed with higher concentration, so as to achieve valuable resource recycling from multiple angles and aspects, reduce the load and operating cost of the factory wastewater treatment system, achieve valuable resource recovery and significantly reduce the energy consumption of the process, and indirectly reduce the carbon emissions between processes.

[0008] Preferably, a feed port is provided at the upper portion of the raw water storage tank, and the feed port is used to add isopropanol waste liquid, and acid-base neutralizer and ion exchange resin for pre-treating the isopropanol waste liquid.

[0009] Preferably, a heat exchanger is provided in the cooling water production tank. The heat exchanger can control the temperature in the cooling water production tank to maintain the temperature of the entire system at a relatively constant room temperature, thereby avoiding the danger of explosion of the volatilized isopropanol gas due to excessive temperature. The heat exchanger can be a 316L stainless steel brazed plate heat exchanger produced by Wharton (Xuzhou) Heat Exchange Equipment Manufacturing Co., Ltd.

[0010] Preferably, the cooling assembly includes a water pump 1, which is located in a cooling water production tank. The water outlet end of the water pump 1 is connected to a metal pipe, and the end of the metal pipe away from the water pump 1 passes through a raw water storage tank and a temporary storage tank and is connected to the cooling water production tank; a spiral portion 1 and a spiral portion 2 are provided on the metal pipe, the spiral portion 1 is located in the raw water storage tank, and the spiral portion 2 is located in the temporary storage tank. Water pump 1 can effectively deliver the cooling water in the cooling water production tank into the raw water storage tank and the temporary storage tank, and maintain the temperature of the solution in the raw water storage tank and the temporary storage tank in a relatively low constant temperature state; the metal pipe can quickly realize heat exchange, and quickly transfer the heat generated in the raw water storage tank and the temporary storage tank to the cooling water in the metal pipe; both ends of the metal pipe are connected to the cooling water production tank, and the water in the cooling water production tank is used as the cooling water source, which is continuously circulated to transfer the heat in the raw water storage tank and the temporary storage tank, and maintain the temperature of the solution in the raw water storage tank and the temporary storage tank in a relatively low constant temperature state; the spiral part 1 has a large contact area with the solution in the raw water storage tank, and can effectively transfer the heat in the solution in the raw water storage tank; the spiral part 2 has a large contact area with the solution in the raw water storage tank, and can effectively transfer the heat in the solution in the temporary storage tank.

[0011] Preferably, a motor 1 is provided on the top of the raw water storage tank, and a stirring rod is provided at the output end of the motor 1. The stirring rod is rotatably arranged in the raw water storage tank, and a plurality of stirring blades are arranged in an array on the surface of the stirring rod, and the assembly of the stirring rod and the stirring blades is located in the spiral part 1. The motor 1 provides power for stirring in the raw water storage tank; the stirring rod drives the stirring blades to rotate, so that the mixed liquid in the raw water storage tank is continuously mixed and reacted, and the heat generated by the reaction is dispersed as soon as possible to avoid local heat accumulation.

[0012] Preferably, a scraper is provided at the lower part of the stirring rod, and the scraper is in contact with the bottom wall of the raw water storage tank. The scraper can prevent sediment from continuously accumulating at the bottom of the raw water storage tank, so that the sediment can also enter the subsequent treatment link together with the solution.

[0013] Preferably, the stirring blade comprises a blade body, the blade body is arranged on the stirring rod, a group of stirring blades are arranged on the blade body, and a guide plate is protruding on the surface of the stirring blade. The blade body can stably fix the stirring blade on the stirring rod, and the stirring blade can stir the mixed liquid in the raw water storage tank well, accelerate the mixing reaction effect and heat diffusion effect; the guide plate can further enhance the stirring disturbance effect on the mixed solution.

[0014] Preferably, grooves are provided on both sides of the guide plate. The grooves cooperate with the guide plate to better enhance the stirring and disturbing effect on the mixed solution.

[0015] Preferably, the stirring rod is sleeved with a rear sleeve at a position away from the motor 1, and a plurality of tail stirring blades are circumferentially arranged on the outer periphery of the rear sleeve, and the tail stirring blades are located in the raw water storage tank. The rear sleeve provides an installation position for the tail stirring blades; the plurality of tail stirring blades can promote the disturbance of the solution at the bottom of the raw water storage tank, and assist in enhancing the stirring effect of the entire stirring structure.

[0016] Preferably, the stirring rod is sleeved with a front sleeve near the motor 1, and a plurality of front stirring blades are arranged circumferentially on the outer periphery of the front sleeve, and the front stirring blades are located in the raw water storage tank. The front sleeve provides an installation position for the front stirring blades; the plurality of front stirring blades can promote the disturbance of the solution at the top of the raw water storage tank, and assist in enhancing the stirring effect of the entire stirring structure.

[0017] Preferably, the security filter comprises a filter housing, the liquid inlet end of the filter housing is connected to the liquid outlet of the raw water storage tank through a pipe, a sealing plate is provided on one side of the filter housing, two groups of slag hoppers are fixedly provided on the sealing plate, and a filter plate is fixedly provided between the two groups of slag hoppers; the interior of the filter housing is filled with filter cotton, and the filter cotton is located below the slag hopper and filter plate assembly; a turntable is fitted on the top of the filter plate, the turntable is fixedly mounted on the bottom end of the stirring rod, and a slag pushing bar is provided in an array on the edge of the turntable, and the slag pushing bar is fitted with the top of the filter plate. The filter housing provides filtering space for the whole filtering process; the sealing plate seals the side of the filter housing to ensure a good closed structure inside the filter housing, and the filtering process is completed smoothly under the pressure of the booster pump; the slag storage hopper is used to store the large particles of impurities filtered out; the filter plate can well block the large particles of impurities; the filter cotton cooperates with the filter plate to completely block and remove the impurity particles that do not meet the requirements as much as possible, so as to avoid the impurity particles that do not meet the requirements affecting the good operation of the subsequent membrane filtration component and the first high-pressure pump; the turntable rotates continuously with the stirring rod, driving the slag pusher bar to rotate together, pushing the large particles of impurities filtered out by the filter plate into the slag storage hopper, and ensuring the good filtering state of the filter plate; the whole security filter has a simple structure and a reasonable design, and can well remove large particles of impurities.

[0018] Preferably, the membrane filtration assembly comprises an outer shell, a membrane tube is provided between the top wall and the bottom wall of the outer shell, a feed pipe is provided at the bottom of the outer shell, the feed pipe is connected to the inside of the membrane tube, the other end of the feed pipe is connected to a first high-pressure pump, a drain pipe is provided at the bottom of the side of the outer shell, the drain pipe is connected to a cooling water production tank; a connecting pipe is provided at the bottom of the outer shell, the connecting pipe is connected to the inside of the membrane tube, the other end of the connecting pipe is connected to a temporary storage box, and a pressure valve is provided on the connecting pipe. The outer shell provides a stable filtering environment for the entire one-stage membrane filtration process; the membrane tube can effectively concentrate the isopropyl alcohol waste liquid, pure water can pass through the membrane tube, and isopropyl alcohol cannot pass through, thereby achieving a good one-stage concentration effect for isopropyl alcohol; the feed pipe is used for the solution to enter the membrane filtration component after being filtered by the safety filter; the drain pipe is used for discharging the pure water that passes through the membrane tube; the connecting pipe is used for discharging the isopropyl alcohol concentrate retained in the membrane tube; when the isopropyl alcohol concentrate needs to be discharged into the temporary storage box, the pressure valve can be controlled to be opened; the entire membrane filtration component has a simple structure and a reasonable design, and can effectively achieve the one-stage concentration of the isopropyl alcohol waste liquid.

[0019] Preferably, two sets of concentric hollow tubes are fixed between the top wall and the bottom wall of the housing, and the membrane tube is clamped between the two sets of hollow tubes. The hollow tubes can reinforce the membrane tube to prevent deformation due to excessive pressure during long-term filtration, thereby ensuring long-term stable filtration of the membrane tube.

[0020] Preferably, the membrane pore size on the membrane tube is 0.02µm to 0.1µm. More preferably, the membrane pore size on the membrane tube is 0.04µm to 0.08µm. The membrane tube with a limited membrane pore size can well retain the isopropanol molecules and avoid the loss of isopropanol molecules during the pressure filtration process.

[0021] Preferably, the membrane filtration assembly 2 includes a housing 2, a feed pipe 2 is provided on the top of the housing 2, the feed pipe 2 is connected to the second high-pressure pump, and a drain pipe 2 is provided at the bottom of the housing 2, the drain pipe 2 is connected to the cooling water tank. The housing 2 provides a stable filtration environment for the entire two-stage membrane filtration process; the drain pipe 2 is used to discharge the pure water that permeates the filtration membrane.

[0022] Preferably, a pull-out plate is provided in the sliding seal inside the second shell, a second mounting ring is movably provided in the second shell, the outer wall surface of the second mounting ring is movably fitted with the inner wall surface of the second shell, a second limiting plate is inserted inside the second mounting ring, a second ultrafiltration membrane is provided on the top of the second mounting ring, a liquid guide plate is provided on the bottom of the second mounting ring, and the second drain pipe is connected with the interior of the second shell after passing through the pull-out plate and the liquid guide plate; a plurality of spheres are fixed on the ring surface of the second mounting ring, and the bottoms of the spheres are embedded in the pull-out plate; at least two first mounting rings are movably stacked in the second shell, the outer wall surface of the first mounting ring is movably fitted with the inner wall surface of the second shell, a first limiting plate is inserted inside the first mounting ring, a first ultrafiltration membrane is provided on the top and bottom of the first mounting ring, and the first mounting ring is located above the second mounting ring. The ultrafiltration membrane can be pulled out from the second housing for cleaning through the pull-out plate, which has good flexibility; the second mounting ring and the first mounting ring form a multi-layer filtration as a whole, so as to obtain a second-stage isopropyl alcohol concentrate with better purity; the second limiting plate can prevent the second ultrafiltration membrane from undergoing irreversible deformation under strong filtration pressure, and support the deformation of the second ultrafiltration membrane; the second ultrafiltration membrane can perform ultimate filtration on the solution that finally passes through, and prevent isopropyl alcohol molecules from passing through; the liquid guide plate as a whole is a structure that gradually tilts or sinks from the edge to the center, which is convenient for collecting the water that finally passes through into the second drain pipe; the bottom of the sphere is movably embedded in the pull-out plate, which is convenient for pulling out the pull-out plate. The second mounting ring is pulled out together with the first mounting ring; a number of spheres are also fixed on the annular surface of the first mounting ring, and the spheres are movably embedded in the second mounting ring or the adjacent first mounting ring, so as to be pulled out together with the pull-out plate for cleaning and inspection; the first limiting plate can prevent the first ultrafiltration membrane from undergoing irreversible deformation under strong filtration pressure, and provide deformation support for the first ultrafiltration membrane; the first ultrafiltration membrane can filter the solution passing through well and prevent isopropanol molecules from passing through; the entire membrane filtration component II has a reasonable structural design and cooperates with the membrane filtration component I to filter the isopropanol waste liquid well as a whole, and finally obtains isopropanol concentrated solution with stepped concentrations for different applications.

[0023] Preferably, the pore sizes of the first ultrafiltration membrane and the second ultrafiltration membrane are both 0.01µm to 0.08µm; the pore sizes of the first ultrafiltration membrane and the second ultrafiltration membrane are both 0.02µm to 0.07µm; the pore sizes of the first ultrafiltration membrane and the second ultrafiltration membrane are both 0.03µm to 0.06µm; the pore sizes of the first ultrafiltration membrane and the second ultrafiltration membrane are both 0.04µm to 0.05µm. The ultrafiltration membrane with limited pore size can well retain isopropanol molecules and avoid the loss of isopropanol molecules during the pressure filtration process.

[0024] Preferably, the second housing is connected with a discharge pipe, the discharge pipe opening of which is located at the first mounting ring on the upper layer, the end of the discharge pipe away from the second housing is connected to the raw water storage tank, and a second pressure valve is provided on the discharge pipe. The discharge pipe is used to discharge the isopropyl alcohol concentrate retained above the first ultrafiltration membrane; when the isopropyl alcohol concentrate needs to be discharged into the raw water storage tank, the second pressure valve can be controlled to open; Preferably, the other end of the drain pipe 2 is connected to a return pipe, which is connected to the drain pipe 1, and the other end of the return pipe is connected to the cooling water tank. The return pipe is used to collect the filtered water in the drain pipe 2 and the filtered water in the drain pipe 1 and send them to the cooling water tank.

[0025] Preferably, the input end of the circulation pump is connected with a suction pipe, which passes through the temporary storage tank and extends to the lower half of the temporary storage tank, and the output end of the circulation pump is connected with a return pipe, which is connected to the top of the raw water storage tank. The suction pipe and the return pipe, under the action of the circulation pump, re-introduce the temporarily stored isopropyl alcohol concentrate in the temporary storage tank into the raw water storage tank for a further concentration treatment, or directly export it to become an isopropyl alcohol concentrate of corresponding concentration for use.

[0026] Preferably, the first pressurizing component is provided inside the membrane filtration component 1; the first pressurizing component includes a first drive shaft, the first drive shaft is connected to the top center of the shell 1 through rotation, the first drive shaft surface is provided with a first spiral blade, the first spiral blade is located in the shell 1, and the first spiral blade gradually decreases in pitch from bottom to top. The first pressurizing component assists in pressurizing the solution in the membrane filtration component 1 to pass through the membrane tube; the first drive shaft drives the first spiral blade to rotate, and the first spiral blade structure with a gradually decreasing pitch from bottom to top can generate a bottom-to-top conductive pressure on the solution in the membrane filtration component 1, so that the solution can pass through the membrane tube better.

[0027] Preferably, a first housing is fixedly mounted on the top of the first housing, a loop pipe 1 is fixedly mounted on the side of the first housing, the loop pipe 1 of the first housing extends downward to between the first housing and the hollow tube, a first blade is provided on the first drive shaft, the first blade is located in the first housing, and the first blade is tangent to the inner wall of the first housing. The first housing provides an installation position for the stable rotation of the first blade; the loop pipe 1 is used to return the power water acting on the first blade to the first drain pipe; the first blade receives the external power water to rotate, driving the first spiral blade to rotate to generate auxiliary transmission pressure from bottom to top on the solution in the membrane filtration component 1.

[0028] Preferably, a first cover is fixedly installed on the top of the first housing, a first venturi tube is connected to the first housing, the first housing is connected to the small-diameter end of the first venturi tube, a double-control solenoid valve is provided at the large-diameter end of the first venturi tube, the double-control solenoid valve is connected to the loop pipe 2, the other end of the loop pipe 2 is provided with a water pump 2, and the water pump 2 is located in the cooling water production tank. The first cover and the first housing together form a relatively closed space, so that the first blade can rotate stably under the total use of power water; the change in the diameter of the first venturi tube generates power water for the first blade, driving the first blade to rotate continuously; the double-control solenoid valve can control the change of water flow passing through the first venturi tube; the loop pipe 2 is used to send the water in the cooling water production tank into the first venturi tube; the water pump 2 provides power for the power water entering the first venturi tube.

[0029] Preferably, the second pressurizing component is provided inside the membrane filtration component 2; the second pressurizing component includes a second drive shaft, the second drive shaft is connected to the top center of the shell 2 through rotation, the second drive shaft surface is provided with a second spiral blade, the second spiral blade is located in the shell 2, and the second spiral blade gradually decreases in pitch from top to bottom. The second pressurizing component assists in pressurizing the solution in the membrane filtration component 2 to pass through the ultrafiltration membrane; the second drive shaft drives the second spiral blade to rotate, and the second spiral blade structure with a gradually decreasing pitch from top to bottom can generate a top-to-bottom conductive pressure on the solution in the membrane filtration component 2, so that the solution can pass through the ultrafiltration membrane better.

[0030] Preferably, a second housing is fixedly mounted on the top of the second housing, a second loop pipe is fixedly mounted on the side of the second housing, the second loop pipe is connected to the second drain pipe, a second blade is arranged on the second drive shaft, the second blade is located in the second housing, and the second blade is tangent to the inner wall of the second housing. The second housing provides an installation position for the stable rotation of the second blade; the second loop pipe is used to return the power water acting on the second blade to the second drain pipe; the second blade receives the external power water to rotate, driving the second spiral blade to rotate to generate an auxiliary transmission pressure from top to bottom on the solution in the second membrane filtration component.

[0031] Preferably, a second cover is fixedly mounted on the top of the second housing, a second venturi tube is connected to the second housing, the second housing is connected to the small-diameter end of the second venturi tube, and the large-diameter end of the second venturi tube is connected to the double-control solenoid valve. The second cover and the second housing together form a relatively closed space, so that the second blade can stably rotate under the total use of power water; the change in the diameter of the second venturi tube generates power water for the second blade, driving the second blade to rotate continuously; the double-control solenoid valve can control the change of water flow passing through the second venturi tube; the second loop pipe is used to send the water in the cooling water production tank into the second venturi tube; the second water pump provides power for the power water entering the second venturi tube.

[0032] The second technical solution of the present invention is a segmented purification and concentration method for isopropanol waste liquid, comprising the following steps: The control cabinet controls the motor to rotate, so as to stir the raw water containing isopropyl alcohol waste liquid in the raw water storage tank; The control cabinet controls the booster pump to start and send the raw water after the step mixing into the security filter; The control cabinet controls the start-up of the first high-pressure pump, and sends the filtrate that has passed through the step security filter into the membrane filtration component 1. The produced water that has passed through the membrane tube of the membrane filtration component 1 enters the cooling produced water tank, and the concentrated water that has not passed through the membrane tube of the membrane filtration component 1 enters the temporary storage tank; The control cabinet controls the circulation pump to start, circulating the concentrated water in the temporary storage tank into the raw water storage tank in the step; Or the control cabinet controls the second high-pressure pump to start, and the concentrated water in the temporary storage tank is sent to the membrane filtration component 2, and the water produced by the ultrafiltration membrane of the membrane filtration component 2 enters the cooling water production tank, and the concentrated water that does not pass through the ultrafiltration membrane of the membrane filtration component 2 is circulated and sent to the raw water storage tank in the step. The motor 1 in the present invention drives the stirring blade to rotate, so that the mixed liquid in the raw water storage tank is continuously mixed and reacted, and the heat generated by the reaction is dispersed as soon as possible to avoid local heat accumulation; the security filter can effectively remove the particulate impurities in the isopropyl alcohol waste liquid, so as to avoid affecting the good operation of the subsequent membrane filtration component 1 and the first high-pressure pump; the booster pump can effectively promote the isopropyl alcohol waste liquid in the raw water storage tank to pass through the security filter; the membrane filtration component 1 can effectively concentrate the isopropyl alcohol waste liquid, and the initial concentration of the isopropyl alcohol waste liquid is 1% to 8%. After passing through the membrane filtration component 1, an isopropyl alcohol concentrate with a concentration of 10% to 15% will be produced; the first high-pressure pump can effectively promote the isopropyl alcohol waste liquid to pass through the membrane filtration component 1 to achieve the concentration effect; the cooling water production tank is used to collect the concentrated qualified water; the temporary storage tank is used to collect the isopropyl alcohol concentrate after the first concentration, so as to provide consideration and buffer for the subsequent second-stage concentration or return to the raw water storage tank to continue the first-stage concentration; if it is necessary to return the isopropyl alcohol concentrate after the first concentration The raw water storage tank continues to carry out a first-stage concentration, and the circulating pump can provide good power; the membrane filtration component 2 can continue to carry out a second-stage concentration of the isopropyl alcohol concentrate in the temporary storage tank, and after passing through the membrane filtration component 2, an isopropyl alcohol concentrate with a concentration of more than 18% to 22% will be produced; the second high-pressure pump can promote the first-stage isopropyl alcohol concentrate to pass through the membrane filtration component 2 to achieve a good second-stage concentration effect; the qualified water passing through the membrane filtration component 2 will continue to be collected in the cooling water production tank, and the second-stage isopropyl alcohol concentrate after interception will be returned to the raw water storage tank for extraction or continue to be fully purified in the first and / or second stages; the present invention circulates the isopropyl alcohol solution in the primary membrane filtration system to continuously concentrate the isopropyl alcohol solution, and the concentrated isopropyl alcohol solution is temporarily stored in the temporary storage tank, and then transported to the membrane filtration component 2 by the second high-pressure pump for further concentration, thereby achieving the purpose of segmented concentration of the isopropyl alcohol solution; the primary membrane filtration system and the secondary membrane filtration system are integrated as a whole, with a high degree of integration and a small footprint.

[0033] Preferably, the pressure generated by the first high-pressure pump is 35 bar to 65 bar. More preferably, the pressure generated by the first high-pressure pump is 40 bar to 60 bar. More preferably, the pressure generated by the first high-pressure pump is 45 bar to 55 bar. The limited pressure ensures that the solution passes through the membrane tube smoothly while not being too large to exceed the bearing capacity of the membrane tube.

[0034] Preferably, the pressure generated by the second high-pressure pump is 70 bar to 110 bar. More preferably, the pressure generated by the second high-pressure pump is 75 bar to 105 bar. More preferably, the pressure generated by the second high-pressure pump is 80 bar to 100 bar. More preferably, the pressure generated by the second high-pressure pump is 85 bar to 95 bar. The limited pressure ensures that the solution passes through the ultrafiltration membrane smoothly while not being too large to exceed the bearing capacity of the ultrafiltration membrane.

[0035] The present invention has the following beneficial effects: (1) The raw water storage tank is used to hold isopropyl alcohol waste liquid to be treated. Through continuous circulation treatment, the concentration is gradually increased. The real-time monitoring of the isopropyl alcohol concentration in the raw water storage tank can be used as isopropyl alcohol solutions of different concentrations according to needs. The security filter can effectively remove particulate impurities in the isopropyl alcohol waste liquid to avoid affecting the subsequent membrane filtration component 1 and the first high-pressure pump. The booster pump can effectively promote the isopropyl alcohol waste liquid in the raw water storage tank to pass through the security filter. The membrane filtration component 1 can effectively concentrate the isopropyl alcohol waste liquid. The initial The initial concentration is 1% to 8%, and after passing through the membrane filtration component 1, an isopropanol concentrate with a concentration of 10% to 15% will be produced; the first high-pressure pump can effectively promote the isopropanol waste liquid to pass through the membrane filtration component 1 to achieve the concentration effect; the cooling water production tank is used to collect the concentrated qualified water; the temporary storage tank is used to collect the isopropanol concentrate after the first stage of concentration, providing consideration and buffering for the subsequent second-stage concentration or returning to the raw water storage tank for the first stage of concentration; if the isopropanol concentrate after the first stage of concentration needs to be returned to the raw water storage tank for the first stage of concentration, the circulation pump can provide good power; (2) The second membrane filtration component can well continue to carry out the second-stage concentration of the isopropyl alcohol concentrate in the temporary storage tank, and after passing through the second membrane filtration component, an isopropyl alcohol concentrate with a concentration of 18% to 22% or more will be produced; the second high-pressure pump can well promote the first-stage isopropyl alcohol concentrate to pass through the second membrane filtration component to achieve a good second-stage concentration effect; the qualified water passing through the second membrane filtration component will continue to be collected in the cooling water production tank, and the second-stage isopropyl alcohol concentrate after interception will be returned to the raw water storage tank for export or continue to be fully purified in the first and / or second stages; the cooling component can well cool the solution in the raw water storage tank and the temporary storage tank, so that the temperature of the entire system is relatively constant at room temperature, avoiding the risk of explosion caused by the volatilized isopropyl alcohol gas due to excessive temperature; (3) The isopropyl alcohol solution is circulated in the primary membrane filtration system to continuously concentrate the isopropyl alcohol solution. The concentrated isopropyl alcohol solution is temporarily stored in the temporary storage tank and then transported to the second membrane filtration component by the second high-pressure pump for further concentration, thereby achieving the purpose of segmented concentration of the isopropyl alcohol solution. The primary membrane filtration system and the secondary membrane filtration system are integrated as a whole, with a high degree of integration and a small footprint. Two isopropyl alcohol concentrates of different concentrations can be obtained through the primary membrane filtration system and the secondary membrane filtration system. Due to the different concentrations, they can be recycled or used as industrial-grade isopropyl alcohol feed with higher concentration, so as to achieve valuable resource recycling from multiple angles and aspects, reduce the load and operating cost of the factory wastewater treatment system, achieve valuable resource recovery and significantly reduce the energy consumption of the process, and indirectly reduce the carbon emissions between processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional structural diagram of the present invention; Figure 2 It is a structural diagram of the primary membrane filtration system of the present invention; Figure 3 It is a structural diagram of the secondary membrane filtration system of the present invention; Figure 4 It is a structural diagram of the pressurizing component of the present invention; Figure 5 It is a structural diagram of the cooling assembly of the present invention; Figure 6 It is a structural diagram of a spiral portion of the present invention; Figure 7 It is a structural diagram of the scraper of the present invention; Figure 8 It is a structural diagram of the stirring blade of the present invention; Fig. 9 yes Figure 8 A in the enlarged view; Fig.10 It is a structural diagram of the front stirring blade and the rear stirring blade of the present invention; Fig.11 It is a structural diagram of the security filter of the present invention; Fig.12 It is a structural diagram of the second spiral portion of the present invention; Fig.13 It is a structural diagram of one part of the membrane filtration assembly of the present invention; Fig.14 It is a structural diagram of the second membrane filtration component of the present invention; Fig.15 It is a structural diagram of the second mounting ring of the present invention; Fig.16 It is a structural diagram of the first mounting ring of the present invention; Fig.17 is a structural diagram of the first pressurizing component of the present invention; Fig.18 is a structural diagram of the second pressurizing assembly of the present invention; Fig.19 It is a system flow chart of the present invention.

[0037] The markings in the attached drawings are: 100-raw water storage tank; 101-feeding port; 102-motor 1; 105-scraper; 106-boosting pump; 107-stirring rod; 108-stirring blade; 1081-blade body; 1082-stirring blade; 1083-guide plate; 1084-groove; 109-rear sleeve; 110-rear stirring blade; 111-front sleeve; 112-front stirring blade; 200-security filter; 201-filter housing; 202-sealing plate; 203-slag storage hopper; 204-filter plate; 2 05-filter cotton; 206-turntable; 207-slag pusher; 300-first high-pressure pump; 400-membrane filter assembly 1; 401-housing 1; 402-hollow tube; 403-membrane tube; 404-feed pipe 1; 405-drain pipe 1; 406-connecting pipe; 407-pressure valve 1; 500-temporary storage box; 600-circulation pump; 601-suction pipe; 602-reflux pipe; 700-second high-pressure pump; 800-membrane filter assembly 2; 801-housing 2; 804-feed pipe 2; 805-drain pipe 2 ;806-discharge pipe;807-pressure valve 2;808-return pipe;809-pull-out plate;810-second mounting ring;811-second limiting plate;812-second ultrafiltration membrane;813-liquid guide plate;814-sphere;815-first mounting ring;816-first limiting plate;817-first ultrafiltration membrane;900-cooling assembly;901-cooling water production tank;902-water pump 1;903-metal pipe;904-spiral part 1;905-spiral part 2;1000-first pressurizing assembly;1001 -first drive shaft; 1002-first spiral blade; 1003-first casing; 1004-loop pipe one; 1005-first blade; 1006-first machine cover; 1007-first venturi tube; 1008-double-control solenoid valve; 1009-loop pipe two; 1010-water pump two; 1100-second pressurizing assembly; 1101-second drive shaft; 1102-second spiral blade; 1103-second casing; 1105-second blade; 1106-second machine cover; 1107-second venturi tube. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0039] like Figure 1The staged isopropanol waste liquid purification and concentration system shown in the figure includes a raw water storage tank 100, which is connected to the raw water storage tank 100 through a pipeline. Fig.11 The security filter 200 shown in the figure has a booster pump 106 disposed on the pipeline between the security filter 200 and the raw water storage tank 100. The security filter 200 is connected to the raw water storage tank 100 through the pipeline. Figure 2 The membrane filtration assembly 400 shown in the figure has a first high-pressure pump 300 on the pipeline between the membrane filtration assembly 400 and the security filter 200, the water outlet of the membrane filtration assembly 400 is connected to the cooling water tank 901 through a pipeline, the concentrated water outlet of the membrane filtration assembly 400 is connected to the temporary storage tank 500 through a pipeline, the temporary storage tank 500 is connected to the raw water storage tank 100 through a pipeline, and a circulating pump 600 is provided on the pipeline between the raw water storage tank 100 and the temporary storage tank 500; the temporary storage tank 500 is connected to the cooling water tank 901 through a pipeline. Figure 3 The membrane filter assembly 800 shown in the figure has a second high-pressure pump 700 disposed on the pipeline between the membrane filter assembly 800 and the temporary storage tank 500. The water outlet of the membrane filter assembly 800 is connected to the cooling water tank 901 through a pipeline, and the concentrated water outlet of the membrane filter assembly 800 is connected to the raw water storage tank 100 through a pipeline. The raw water storage tank 100 and the temporary storage tank 500 are both connected through the pipeline. Figure 5 Cooling assembly 900 is shown.

[0040] The raw water storage tank 100 is provided with a feed port 101 at the top. A heat exchanger is provided in the cooling water production tank. The cooling assembly 900 includes a water pump 902, which is located in the cooling water production tank 901. The water outlet of the water pump 902 is connected to a metal pipe 903. The end of the metal pipe 903 away from the water pump 902 passes through the raw water storage tank 100 and the temporary storage tank 500 and is connected to the cooling water production tank 901. The metal pipe 903 is provided with the following Figure 6 The spiral portion 904 shown and Fig.12 As shown, the spiral portion 2 905 and the spiral portion 1 904 are located in the raw water storage tank 100 , and the spiral portion 2 905 is located in the temporary storage tank 500 .

[0041] The top of the raw water storage tank 100 is provided with a motor 102, and the output end of the motor 102 is provided with a stirring rod 107, which is rotatably arranged in the raw water storage tank 100, and the surface array of the stirring rod 107 is provided with the following Figure 8 The stirring blades 108 shown in FIG. 1 and the stirring rod 107 and the stirring blade 108 are assembled in the spiral portion 904. The lower part of the stirring rod 107 is provided with a Figure 7The scraper 105 shown is fitted with the bottom wall of the raw water storage tank 100. The stirring blade 108 includes a blade body 1081, which is arranged on the stirring rod 107. A set of stirring blades 1082 are arranged on the blade body 1081. The stirring blades 1082 are protruded from the surface of the stirring blades 1082. The two opposite sides of the guide plate 1083 are provided with grooves 1084. The stirring rod 107 is far away from the motor 102. The rear sleeve 109 is provided with a circumferential shape as shown in FIG. Fig. 9 The rear stirring blades 110 are shown in the figure. The rear stirring blades 110 are located in the raw water storage tank 100. The stirring rod 107 is provided with a front sleeve 111 near the motor 102. The outer periphery of the front sleeve 111 is provided with the following Fig.10 A plurality of front stirring blades 112 are shown, and the front stirring blades 112 are located in the raw water storage tank 100 .

[0042] The security filter 200 includes a filter housing 201, the liquid inlet end of the filter housing 201 is connected to the liquid outlet of the raw water storage tank 100 through a pipeline, a sealing plate 202 is provided on one side of the filter housing 201, two groups of slag buckets 203 are fixedly provided on the sealing plate 202, and a filter plate 204 is fixedly provided between the two groups of slag buckets 203; the interior of the filter housing 201 is filled with filter cotton 205, and the filter cotton 205 is located below the assembly of the slag bucket 203 and the filter plate 204; a turntable 206 is attached to the top of the filter plate 204, the turntable 206 is fixedly installed at the bottom end of the stirring rod 107, and a slag pusher bar 207 is provided in an array on the edge of the turntable 206, and the slag pusher bar 207 is attached to the top of the filter plate 204.

[0043] The membrane filtration assembly 400 includes a housing 401, and a membrane filtration assembly 401 includes a housing 401, wherein a membrane filtration assembly 400 includes a housing 401, and ... Fig.13 The membrane tube 403 shown in the figure has a feed pipe 404 at the bottom of the shell 401, which is connected to the inside of the membrane tube 403, and the other end of the feed pipe 404 is connected to the first high-pressure pump 300. A drain pipe 405 is provided at the bottom of the side of the shell 401, and the drain pipe 405 is connected to the cooling water production tank 901; a connecting pipe 406 is provided at the bottom of the shell 401, which is connected to the inside of the membrane tube 403, and the other end of the connecting pipe 406 is connected to the temporary storage box 500, and a pressure valve 407 is provided on the connecting pipe 406. Two groups of concentric hollow tubes 402 are fixed between the top wall and the bottom wall of the shell 401, and the membrane tube 403 is clamped between the two groups of hollow tubes 402. The membrane pore size on the membrane tube 403 is 0.02µm~0.1µm; the membrane pore size on the membrane tube 403 is 0.04µm~0.08µm.

[0044] The membrane filtration assembly 800 includes a second housing 801. A second feed pipe 804 is provided at the top of the second housing 801. The second feed pipe 804 is connected to the second high-pressure pump 700. A second drain pipe 805 is provided at the bottom of the second housing 801. The second drain pipe 805 is connected to the cooling water tank 901. The sliding seal in the second housing 801 is provided as follows Fig.14 The pull-out plate 809 shown in the figure has a second mounting ring 810 movably disposed in the second housing 801. The outer wall surface of the second mounting ring 810 movably fits with the inner wall surface of the second housing 801. A second limiting plate 811 is inserted into the interior of the second mounting ring 810. The top of the second mounting ring 810 is provided with Fig.15 The second ultrafiltration membrane 812 is shown, and the bottom of the second mounting ring 810 is provided with a liquid guide plate 813. The second drainage pipe 805 passes through the pull-out plate 809 and the liquid guide plate 813 and is connected to the inside of the second housing 801. A plurality of spheres 814 are fixed on the ring surface of the second mounting ring 810, and the bottom of the spheres 814 is embedded in the pull-out plate 809. At least two first mounting rings 815 are movably stacked in the second housing 801, and the outer wall surface of the first mounting ring 815 is movably fitted with the inner wall surface of the second housing 801. A first limiting plate 816 is inserted into the interior of the first mounting ring 815, and the top and bottom of the first mounting ring 815 are provided as shown in the figure. Fig.16 The first ultrafiltration membrane 817 shown, the first mounting ring 815 is located above the second mounting ring 810. The membrane pore size of the first ultrafiltration membrane 817 and the second ultrafiltration membrane 812 is 0.01µm to 0.08µm; the membrane pore size of the first ultrafiltration membrane 817 and the second ultrafiltration membrane 812 is 0.02µm to 0.07µm; the membrane pore size of the first ultrafiltration membrane 817 and the second ultrafiltration membrane 812 is 0.03µm to 0.06µm; the membrane pore size of the first ultrafiltration membrane 817 and the second ultrafiltration membrane 812 is 0.04µm to 0.05µm. The second housing 801 is connected with a discharge pipe 806, the discharge pipe opening of the discharge pipe 806 is located at the upper first mounting ring 815, the end of the discharge pipe 806 away from the second housing 801 is connected to the raw water storage tank 100, and the discharge pipe 806 is provided with a second pressure valve 807.

[0045] The other end of the drain pipe 2 805 is connected to a return pipe 808, which is connected to the drain pipe 1 405, and the other end of the return pipe 808 is connected to the cooling water tank 901. The input end of the circulation pump 600 is connected to a suction pipe 601, which passes through the temporary storage tank 500 and extends to the lower half of the temporary storage tank 500. The output end of the circulation pump 600 is connected to a return pipe 602, which is connected to the top of the raw water storage tank 100.

[0046] The interior of the membrane filtration assembly 400 is provided with Fig.17The first pressurizing assembly 1000 shown in the figure comprises a first driving shaft 1001, which is rotatably connected to the top center of the housing 1 401, and a first spiral blade 1002 is provided on the surface of the first driving shaft 1001, and the first spiral blade 1002 is located in the housing 1 401, and the pitch of the first spiral blade 1002 gradually decreases from bottom to top. A first housing 1003 is fixedly installed on the top of the housing 1 401, and a loop pipe 1004 is fixedly installed on the side of the first housing 1003, and the loop pipe 1004 at the housing 1 401 extends downward to between the housing 1 401 and the hollow pipe 402, and a first blade 1005 is provided on the first driving shaft 1001, and the first blade 1005 is located in the first housing 1003, and the first blade 1005 is tangent to the inner wall of the first housing 1003. The first housing 1003 has a first cover 1006 fixedly mounted on the top thereof. The first housing 1003 is connected to a first venturi tube 1007. The first housing 1003 is connected to a small-diameter end of the first venturi tube 1007. The large-diameter end of the first venturi tube 1007 is provided with a Figure 4 The double-control solenoid valve 1008 is shown, and the double-control solenoid valve 1008 is connected to the loop pipe 1009. The other end of the loop pipe 1009 is provided with a water pump 1010. The water pump 1010 is located in the cooling water production tank 901.

[0047] The interior of the membrane filtration assembly 800 is provided with Fig.18 The second pressurizing assembly 1100 shown in the figure comprises a second driving shaft 1101, which is rotatably connected to the top center of the second housing 801, and a second spiral blade 1102 is provided on the surface of the second driving shaft 1101, and the second spiral blade 1102 is located in the second housing 801, and the pitch of the second spiral blade 1102 gradually decreases from top to bottom. A second housing 1103 is fixedly installed on the top of the second housing 801, and a second loop pipe 1109 is fixedly installed on the side of the second housing 1103, and the second loop pipe 1109 is connected to the second drain pipe 805, and a second blade 1105 is provided on the second driving shaft 1101, and the second blade 1105 is located in the second housing 1103, and the second blade 1105 is tangent to the inner wall of the second housing 1103. A second machine cover 1106 is fixedly installed on the top of the second housing 1103 , and a second venturi tube 1107 is connected to the second housing 1103 . The second housing 1103 is connected to the small-diameter end of the second venturi tube 1107 , and the large-diameter end of the second venturi tube 1107 is connected to the dual-control solenoid valve 1008 .

[0048] like Fig.19 The stepwise purification and concentration method of isopropanol waste liquid comprises the following steps: (S01) The control cabinet controls the motor to rotate, thereby stirring the raw water containing isopropyl alcohol waste liquid in the raw water storage tank; (S02) The control cabinet controls the booster pump to start, and sends the raw water stirred in step (S01) into the security filter; (S03) The control cabinet controls the first high-pressure pump to start, and the filtrate passing through the security filter in step (S02) is sent to the membrane filter assembly 1, the produced water passing through the membrane tube of the membrane filter assembly 1 enters the cooling water tank, and the concentrated water that does not pass through the membrane tube of the membrane filter assembly 1 enters the temporary storage tank; (S04) The control cabinet controls the circulation pump to start, and circulates the concentrated water in the temporary storage tank into the raw water storage tank in step (S01); Or the control cabinet controls the second high-pressure pump to start, and the concentrated water in the temporary storage tank is sent to the membrane filtration component 2, and the water produced by the ultrafiltration membrane of the membrane filtration component 2 enters the cooling water production tank, and the concentrated water that does not pass through the ultrafiltration membrane of the membrane filtration component 2 is circulated and sent to the raw water storage tank in step S01.

[0049] The pressure generated by the first high-pressure pump is 35bar~65bar; the pressure generated by the first high-pressure pump is 40bar~60bar; the pressure generated by the first high-pressure pump is 45bar~55bar. The pressure generated by the second high-pressure pump is 70bar~110bar; the pressure generated by the second high-pressure pump is 75bar~105bar; the pressure generated by the second high-pressure pump is 80bar~100bar; the pressure generated by the second high-pressure pump is 85bar~95bar.

[0050] The invention comprises a primary membrane filtration system composed of a raw water storage tank 100, a booster pump 106, a security filter 200, a first high-pressure pump 300, a membrane filtration assembly 1 400, a temporary storage tank 500 and a circulation pump 600, and a secondary membrane filtration system composed of a temporary storage tank 500, a second high-pressure pump 700 and a membrane filtration assembly 2 800. The primary membrane filtration system concentrates the isopropanol waste liquid with a concentration of 1%-8% at a pressure of 35bar-65bar, and finally concentrates it to 10%-15%. The secondary membrane filtration system concentrates the isopropanol waste liquid with a concentration of 1%-8% at a pressure of 70bar-110bar, and finally concentrates the isopropanol to 10%-15%. The waste liquid is concentrated to more than 18%-22%; the primary membrane filtration system removes trace polyvalent metal ions and suspended solid particles in the water through acid-base neutralization, ion exchange resin and filter element filtration of the isopropanol waste liquid at room temperature, and then sets the water inlet to reach 35bar-65bar pressure for treatment. The waste liquid volume is concentrated to 1 / 20-1 / 10 of the original volume through the primary membrane filtration system. At the same time, the isopropanol concentration is increased to 10%-15%; the secondary membrane filtration system is to feed a certain amount of water into the concentrated liquid of the primary membrane filtration system to make it at 70bar- The concentration is driven under a high pressure of 110bar. This process further concentrates the volume of the concentrate to 1 / 100-1 / 40 of the original volume, and its isopropanol concentration reaches more than 18%-22%%; the control cabinet adopts PLC for full-automatic control, and the control cabinet is integrated with the Internet of Things function module to realize the system's remote monitoring, data collection, system early warning, operation optimization and other functions, and can realize remote Internet of Things monitoring and online alarm system; two isopropanol concentrates of different concentrations can be obtained through the primary membrane filtration system and the secondary membrane filtration system. Due to the different concentrations, they can be divided into It can be recycled or fed with higher concentration of industrial-grade isopropyl alcohol, so as to achieve valuable resource recycling from multiple angles and aspects, thereby reducing the compliance and operating costs of the factory wastewater treatment system; achieve valuable resource recovery and greatly reduce the energy consumption of the process, thereby reducing the carbon emissions between processes; under the action of the cooling component, the whole process is carried out in the liquid phase at low temperature, the system can be started and stopped in real time without preheating, and no corresponding concentration of isopropyl alcohol gas (combustible) is generated during the process, so the system construction, operation energy consumption and the risk of gas combustion or explosion accidents are greatly reduced.

[0051] The present invention adopts modular integration as a whole, organically combines various functional units, and forms a fully automatic concentration system, wherein an online thermometer, an online pressure gauge, an online conductivity meter, an online pH monitor, and an online ORP monitor are arranged, and various indicators such as temperature, pressure, conductivity, pH, and ORP can be monitored in real time, and the floor space is relatively small. The control cabinet can realize remote monitoring and online alarm of the Internet of Things, and ensure the safety of equipment and staff in many aspects; the primary membrane filtration system and the secondary membrane filtration system are both designed with SS316L material; wherein the water pump 1 and the water pump 2 are both vertical or horizontal centrifugal pumps. Concentration is carried out for low-concentration isopropanol waste liquid, and the process degree is high. Concentration and purification can be carried out under a small floor space, and different concentration effects can be achieved at the same time. The concentrated liquid of different concentrations can be used for multiple purposes; the system has a high degree of automation, and remote monitoring can be realized through the Internet of Things, which can ensure the safety of users while more efficiently monitoring the operation of the equipment, and can more effectively reach the concentration of isopropanol.

[0052] The segmented isopropanol waste liquid purification and concentration system comprises a raw water storage tank 100, the raw water storage tank 100 is connected to a security filter 200 through a pipeline, the security filter 200 is connected to a first high-pressure pump 300 through a pipeline, the output end of the first high-pressure pump 300 is connected to a membrane filtration component 400 through a pipeline, the membrane filtration component 400 is connected to a temporary storage box 500 through a pipeline, and a circulation pump 600 is connected between the raw water storage tank 100 and the temporary storage box 500 through a pipeline, the first high-pressure pump 300 is used to pump the isopropanol solution in the raw water storage tank 100 into the membrane filtration component 400, and the circulation pump 600 is used to The isopropanol solution in the temporary storage tank 500 is sucked into the raw water storage tank 100; the raw water storage tank 100, the booster pump 106, the security filter 200, the first high-pressure pump 300, the membrane filter assembly 400, the temporary storage tank 500 and the circulation pump 600 form a primary membrane filtration system; the isopropanol solution is stored in the raw water storage tank 100, and under the action of the booster pump 106 and the first high-pressure pump 300, the isopropanol solution passes through the security filter 200, and the solid particles in the isopropanol solution are filtered by the security filter 200 to prevent the solid particles from entering the first high-pressure pump 300 and the membrane filter assembly 400. The isopropanol solution after solid-liquid separation enters the membrane filter assembly 400, and after the isopropanol solution is concentrated, it is transported to the temporary storage tank 500, and the produced water in the concentration process is directly discharged to the cooling produced water tank 901. The concentrated isopropanol solution in the temporary storage tank 500 is then refluxed into the raw water storage tank 100 through the circulation pump 600. Thereby, the isopropanol solution circulates in the primary membrane filtration system and is continuously concentrated.

[0053] A suction pipe 601 is fixedly installed at the input end of the circulation pump 600, and the suction pipe 601 extends through the lower half of the temporary storage tank 500. A return pipe 602 is fixedly installed at the output end of the circulation pump 600, and the other end of the return pipe 602 is fixedly installed on the top of the raw water storage tank 100. Thus, the isopropyl alcohol solution in the temporary storage tank 500 is sucked into the raw water storage tank 100 by the circulation pump 600, so that the concentrated isopropyl alcohol solution is mixed with the isopropyl alcohol raw material in the raw water storage tank 100.

[0054] The temporary storage box 500 is connected to the second high-pressure pump 700 through a pipeline, and the output end of the second high-pressure pump 700 is connected to the membrane filter assembly 800 through a pipeline. The second high-pressure pump 700 is used to pump the isopropanol solution in the temporary storage box 500 into the membrane filter assembly 800; the temporary storage box 500, the second high-pressure pump 700 and the membrane filter assembly 800 form a two-stage membrane filtration system. The concentrated isopropanol solution in the temporary storage box 500 is transported to the membrane filter assembly 800 through the second high-pressure pump 700, so that the isopropanol solution is concentrated again. Similarly, multiple groups of membrane filter assemblies 800 can also be set, and multiple membrane filter assemblies 800 are connected in sequence, so that the isopropanol solution passes through multiple membrane filter assemblies 800 in sequence and is continuously concentrated.

[0055] The raw water storage tank 100 and the temporary storage tank 500 are penetrated with a cooling assembly 900, and the cooling assembly 900 is used to cool the isopropyl alcohol solution inside the raw water storage tank 100 and the temporary storage tank 500. The cooling produced water is stored inside the cooling produced water tank 901, and a water pump 902 is arranged inside the cooling produced water tank 901. A metal pipe 903 is fixedly installed at the output end of the water pump 902. The metal pipe 903 penetrates and is fixed on the raw water storage tank 100 and the temporary storage tank 500, and the other end of the metal pipe 903 is fixedly installed on the cooling produced water tank 901, so that the water pump 902 sucks the cooling produced water in the cooling produced water tank 901, and the cooling produced water flows along the metal pipe 903 through the raw water storage tank 100 and the temporary storage tank 500, and then flows back to the cooling produced water tank 901, so that the cooling produced water circulates. The cooling produced water inside the cooling produced water tank 901 directly diffuses heat into the air. A refrigeration component or a heat exchanger may also be provided at the cooling water tank 901 to cool the cooling water. The metal pipe 903 is provided with a spiral portion 1 904 and a spiral portion 2 905, and the spiral portion 1 904 and the spiral portion 2 905 are respectively located in the raw water storage tank 100 and the temporary storage tank 500. By providing the spiral portion 1 904 and the spiral portion 2 905, the time for the cooling water to flow inside the raw water storage tank 100 and the temporary storage tank 500 is extended, thereby ensuring the cooling effect on the isopropyl alcohol solution.

[0056] The upper surface of the raw water storage tank 100 is provided with a feed port 101, and the feed port 101 is used to add the isopropanol solution raw material into the raw water storage tank 100. A motor 102 is fixedly installed on the top of the raw water storage tank 100, and a stirring rod 107 is fixedly installed at the output end of the motor 102. The surface of the stirring rod 107 is provided with stirring blades 108 in an array, and the assembly of the stirring rod 107 and the stirring blade 108 is located inside the spiral part 1904. The assembly of the stirring rod 107 and the stirring blade 108 is driven to rotate by the motor 102 to stir the isopropanol solution inside the raw water storage tank 100, so that the concentrated isopropanol solution inside the temporary storage tank 500 is sucked into the raw water storage tank 100 by the circulating pump 600, and the mixing efficiency of the isopropanol solution raw material and the concentrated isopropanol solution can be improved through the stirring action of the stirring rod 107 and the stirring blade 108. In addition, the stirring effect can improve the cooling efficiency of the isopropyl alcohol solution by the cooling water produced inside the spiral part 904. The scraper 105 is fixedly installed at the lower part of the stirring rod 107, and the scraper 105 is attached to the bottom wall of the raw water storage tank 100. The scraper 105 scrapes the bottom wall of the raw water storage tank 100, so that the solid impurities accumulated on the bottom wall of the raw water storage tank 100 enter the security filter 200.

[0057] The security filter 200 includes a filter housing 201 connected to the raw water storage tank 100 through a pipeline, a sealing plate 202 is provided at the left end of the filter housing 201, two groups of slag hoppers 203 are fixedly installed on the right side of the sealing plate 202, a filter plate 204 is fixedly installed between the two groups of slag hoppers 203, and the filter housing 201 is filled with filter cotton 205, which is located below the assembly of the slag hopper 203 and the filter plate 204. A turntable 206 is attached to the top of the filter plate 204, and the turntable 206 is fixedly installed at the bottom of the rotating shaft 103. The edge array of the turntable 206 is fixed with slag pusher bars 207. The solid particles in the isopropyl alcohol solution enter the filter housing 201 from the raw water storage tank 100, and the large solid particles are blocked by the filter plate 204. Then, the turntable 206 is driven to rotate by the stirring rod 107, and the slag pusher bars 207 sweep the top of the filter plate 204, so that the large solid particles enter the slag hopper 203. Prevent excessive solid particles from accumulating on the surface of the filter cotton 205, thereby reducing the filtering effect of the filter cotton 205.

[0058] The membrane filtration assembly 400 includes a housing 401, a membrane tube 403 is fixedly installed between the top wall and the bottom wall of the housing 401, and an annular water production cavity is formed between the outer wall of the membrane tube 403 and the inner wall of the housing 401. Two sets of concentric hollow tubes 402 are fixedly installed between the top wall and the bottom wall of the housing 401, and the two sets of hollow tubes 402 are used to clamp and fix the membrane tube 403. A feed pipe 404 is fixedly installed at the bottom of the housing 401, and the feed pipe 404 is connected to the inner side of the membrane tube 403. The other end of the feed pipe 404 is connected to the first high-pressure pump 300. After the isopropanol solution is transported to the inside of the membrane tube 403 through the feed pipe 404, part of the water in the isopropanol solution passes through the membrane tube 403 and enters the annular water production cavity. The membrane tube 403 is supported by the two sets of hollow tubes 402 to prevent the water pressure in the membrane tube 403 from being too high, causing the membrane tube 403 to bend or be damaged. A drain pipe 405 is provided at the bottom of the side of the housing 401, and the drain pipe 405 is used to discharge the water produced by the isopropyl alcohol solution after being filtered by the membrane tube 403; a connecting pipe 406 is fixedly installed at the bottom of the housing 401, and the connecting pipe 406 is connected to the inner side of the membrane tube 403, and a pressure valve 407 is provided on the surface of the connecting pipe 406. The other end of the connecting pipe 406 is connected to the temporary storage box 500, and the connecting pipe 406 is used to transport the concentrated isopropyl alcohol solution to the temporary storage box 500. Through the setting of the pressure valve 407, the hydraulic pressure of the isopropyl alcohol solution inside the membrane tube 403 reaches a predetermined value, and the concentrated isopropyl alcohol solution inside the membrane tube 403 flows from the connecting pipe 406 into the temporary storage box 500. Through the high pressure inside the membrane tube 403, the water inside the isopropyl alcohol solution is forced to pass through the membrane tube 403, thereby ensuring the concentration effect of the isopropyl alcohol solution.

[0059] The membrane filtration component 800 includes a second shell 801. A second feed pipe 804 is provided on the top of the second shell 801. The second feed pipe 804 is connected to the second high-pressure pump 700. A second drain pipe 805 is provided on the bottom of the second shell 801. The second drain pipe 805 is connected to the cooling water production tank 901. The second shell provides a stable filtration environment for the entire two-stage membrane filtration process; the second drain pipe is used for the discharge of pure water that passes through the filtration membrane. A pull-out plate 809 is provided as a sliding seal inside the second shell 801. A second mounting ring 810 is movably provided inside the second shell 801. The outer wall surface of the second mounting ring 810 is movably fitted with the inner wall surface of the second shell 801. A second limiting plate 811 is inserted inside the second mounting ring 810. A second ultrafiltration membrane 812 is provided on the top of the second mounting ring 810. A liquid guide plate 813 is provided at the bottom of the second mounting ring 810. The second drain pipe 805 passes through the pull-out plate 809 and the liquid guide plate 813 and is connected to the inside of the second shell 801. The second mounting ring 810 has a plurality of spheres 814 fixed on its surface, and the bottom of the spheres 814 is embedded in the pull-out plate 809; at least two first mounting rings 815 are movably stacked in the second outer shell 801, and the outer wall of the first mounting ring 815 is movably fitted with the inner wall of the second outer shell 801, and a first limiting plate 816 is inserted into the interior of the first mounting ring 815, and a first ultrafiltration membrane 817 is provided on the top and bottom of the first mounting ring 815, and the first mounting ring 815 is located above the second mounting ring 810. The ultrafiltration membrane can be pulled out from the second housing 801 for cleaning through the pull-out plate 809, which has good flexibility; the second mounting ring 810 and the first mounting ring 815 form a multi-layer filtration as a whole, so as to obtain a second-stage isopropyl alcohol concentrate with better purity; the second limiting plate 811 can prevent the second ultrafiltration membrane 812 from undergoing irreversible deformation under strong filtration pressure, and support the second ultrafiltration membrane 812 in deformation; the second ultrafiltration membrane 812 can perform ultimate filtration on the solution that finally passes through, and prevent isopropyl alcohol molecules from passing through; the liquid guide plate 813 is a structure that gradually tilts or sinks from the edge to the center, which is convenient for collecting the water that finally passes through into the drain pipe 805; the bottom of the sphere 814 is movably embedded in the pull-out plate 809, which is convenient for pulling out the second ultrafiltration membrane 812 when the pull-out plate 809 is pulled out. The mounting ring 810 is pulled out together with the first mounting ring 815; a plurality of spheres 814 are also fixed on the annular surface of the first mounting ring 815, and the spheres 814 are movably engaged with the second mounting ring 810 or the adjacent first mounting ring 815, so as to be pulled out together with the pull-out plate 809 for cleaning and inspection; the first limiting plate 816 can prevent the first ultrafiltration membrane 817 from undergoing irreversible deformation under strong filtering pressure, and provide deformation support for the first ultrafiltration membrane 817; the first ultrafiltration membrane 817 can filter the solution passing through well and prevent isopropanol molecules from passing through; the entire membrane filtration component 2 800 has a reasonable structural design and cooperates with the membrane filtration component 1 400 to filter the isopropanol waste liquid well as a whole, and finally obtain isopropanol concentrate with a stepped concentration for different applications.

[0060] The first pressurizing assembly 1000 includes a first driving shaft 1001 which is rotatably connected to the top center of the housing 1 401, the top of the first driving shaft 1001 is located on the upper side of the bottom wall of the housing 1 401, and a first spiral blade 1002 is fixedly mounted on the surface of the first driving shaft 1001, and the pitch of the first spiral blade 1002 gradually decreases from bottom to top; A first casing 1003 is fixedly installed on the top of the casing 1001, a loop pipe 1004 is fixedly installed on the side of the first casing 1003, the loop pipe 1004 extends downward between the casing 1 401 and the hollow pipe 2 402, a first blade 1005 is fixedly installed on the top of the first drive shaft 1001 and located inside the first casing 1003, the first blade 1005 is tangent to the inner wall of the first casing 1003, a first machine cover 1006 is fixedly installed on the top of the first casing 1003, a small-diameter end of a first venturi tube 1007 is fixedly installed on the outer wall of the first casing 1003, a double-control solenoid valve 1008 is fixedly installed on the large-diameter end of the first venturi tube 1007, one end of a loop pipe 2 1009 is fixedly installed on the bottom of the double-control solenoid valve 1008, a water pump 2 1010 is fixedly installed on the other end of the loop pipe 2 1009, and the water pump 2 1010 is installed inside the cooling water production tank 901.

[0061] The cooling produced water in the cooling water tank 901 is extracted by the water pump 1010 and enters the loop pipe 1009. The opening of the double-control solenoid valve 1008 is selected according to the situation. The double-control solenoid valve 1008 can be opened by one and closed by the other. The double-control solenoid valve 1008 can also be opened at the same time. The cooling produced water passes through the double-control solenoid valve 1008 and enters the first venturi tube 1007. The first venturi tube 1007 can pressurize the flowing cooling produced water. Then, the cooling produced water is sprayed from the small-diameter end of the first venturi tube 1007 onto the first blade 1005. Then, the first blade 1005 circulates in the first housing 1003. The first blade 1005 also rotates with the first drive shaft 1001 and the first spiral blade 1002. The pressure applied by the first spiral blade 1002 to the isopropyl alcohol solution gradually increases, thereby ensuring the hydraulic pressure of the isopropyl alcohol solution and further improving the filtering effect of the isopropyl alcohol solution.

[0062] The cooling water rotates in the gap between the first blades 1005 to the protruding part on the side of the first casing 1003, and then enters the gap between the outer casing 401 and the hollow tube 402 through the loop pipe 1004, and finally returns to the cooling water tank 901 from the drain pipe 405. In this process, the produced water is reused to achieve environmental protection and energy saving effects.

[0063] The second pressurizing component 1100 includes a second drive shaft 1101, which is rotatably connected to the top center of the second housing 801. A second spiral blade 1102 is provided on the surface of the second drive shaft 1101. The second spiral blade 1102 is located in the second housing 801, and the pitch of the second spiral blade 1102 gradually decreases from top to bottom. The second pressurizing component 1100 assists in pressurizing the solution in the second membrane filtration component 800 to pass through the ultrafiltration membrane; the second drive shaft 1101 drives the second spiral blade 1102 to rotate, and the second spiral blade 1102 structure with a gradually decreasing pitch from top to bottom can generate a conductive pressure from top to bottom on the solution in the second membrane filtration component 800, so that the solution can pass through the ultrafiltration membrane better. The second housing 1103 is fixedly installed on the top of the second housing 801, and the second loop pipe 1109 is fixedly installed on the side of the second housing 1103. The second loop pipe 1109 is connected to the second drain pipe 805. The second driving shaft 1101 is provided with a second blade 1105, and the second blade 1105 is located in the second housing 1103. The second blade 1105 is tangent to the inner wall of the second housing 1103. The second housing 1103 provides an installation position for the stable rotation of the second blade 1105; the second loop pipe 1109 is used to return the power water acting on the second blade 1105 to the second drain pipe 805; the second blade 1105 receives the external power water to rotate, driving the second spiral blade 1102 to rotate to generate an auxiliary transmission pressure from top to bottom on the solution in the second membrane filtration component 800. A second cover 1106 is fixedly installed on the top of the second housing 1103. A second venturi tube 1107 is connected to the second housing 1103. The second housing 1103 is connected to the small-diameter end of the second venturi tube 1107, and the large-diameter end of the second venturi tube 1107 is connected to the double-control solenoid valve 1008. The second cover 1106 and the second housing 1103 together form a relatively closed space, so that the second blade 1105 can stably rotate under the total use of power water; the change in the diameter of the second venturi tube 1107 generates power water for the second blade 1105, driving the second blade 1105 to rotate continuously; the double-control solenoid valve 1008 can control the change of water flow passing through the second venturi tube 1107; the second loop pipe 1109 is used to send the water in the cooling water production tank 901 into the second venturi tube 1107; the second water pump provides power for the power water entering the second venturi tube.

[0064] The working process of the present invention is: When in use, first, the isopropyl alcohol solution to be concentrated is stored in the raw water storage tank 100. Under the action of the booster pump 106 and the first high-pressure pump 300, the isopropyl alcohol solution passes through the security filter 200 and enters the housing 401 through the feed pipe 404. When the isopropyl alcohol solution passes through the security filter 200, the solid particles inside are intercepted. The isopropyl alcohol solution entering the shell 401 is temporarily stored in the membrane tube 403. Part of the water passes through the membrane tube 403 and the hollow tube 402, and is discharged from the drain pipe 405 to the return pipe 808 as concentrated produced water, and finally enters the cooling water tank 901. As the amount of isopropyl alcohol transported into the membrane tube 403 by the feed pipe 404 increases, the hydraulic pressure inside the membrane tube 403 increases. When the hydraulic pressure reaches the preset value of the pressure valve 407, the concentrated isopropyl alcohol enters the temporary storage box 500 from the connecting pipe 406. The low-concentration isopropyl alcohol solution is discharged from the raw water storage tank 100 through the drain pipe 405. The water enters the security filter 200 through the booster pump 106, and impurities such as particles in the feed liquid are removed through the security filter 200 to prevent it from entering the first high-pressure pump 300 and the membrane filter assembly 400; the water enters the first high-pressure pump 300 after the water is discharged from the security filter 200, and enters the membrane filter assembly 400 after being pressurized again by the first high-pressure pump 300. Under the high-pressure environment, the produced water enters the cooling produced water tank 901 through the produced water pipeline, and the concentrated water enters the temporary storage tank 500 after the pressure is released through the pressure valve 407. In this process, the relevant flow rate can be adjusted by adjusting the pressure; The isopropyl alcohol in the temporary storage tank 500 is then sucked by the circulation pump 600 and transported to the raw water storage tank 100, so that the concentrated isopropyl alcohol solution and the isopropyl alcohol raw material are mixed; the stirring rod 107 and the stirring blade 108 are driven by the motor 102 to rotate and stir, thereby improving the mixing efficiency of the concentrated isopropyl alcohol solution and the isopropyl alcohol raw material; and the concentration of the isopropyl alcohol solution in the raw water storage tank 100 is increased through the mixing effect. The isopropyl alcohol solution circulates in the primary membrane filtration system, continuously increasing the concentration of the isopropyl alcohol solution; In this process, the cooling water in the cooling water tank 901 is sucked by the water pump 1 902, and the cooling water flows through the metal pipe 903 and then flows back to the cooling water tank 901; through the setting of the spiral part 1 904 and the spiral part 2 905, the isopropyl alcohol solution inside the raw water storage tank 100 and the temporary storage tank 500 is cooled.

[0065] The concentrated isopropyl alcohol solution in the temporary storage box 500 is sucked into the second outer shell 801 along the second feed pipe 804 through the second high-pressure pump 700, and the concentrated isopropyl alcohol solution is temporarily stored in the second outer shell 801. The hydraulic pressure inside the second outer shell 801 is guaranteed by the second pressure valve 807, and the filtering effect of the first ultrafiltration membrane 817 and the second ultrafiltration membrane 812 on the isopropyl alcohol solution is promoted. The concentrated water is discharged from the second drain pipe 805 to the return pipe 808, and finally enters the cooling water tank 901; the concentrated isopropyl alcohol solution is discharged from the discharge pipe 806.

Claims

1. The segmented purification and concentration system of isopropanol waste liquid is characterized by: The invention comprises a raw water storage tank (100), wherein the raw water storage tank (100) is connected to a security filter (200) via a pipeline, a booster pump (106) is provided on the pipeline between the security filter (200) and the raw water storage tank (100), the security filter (200) is connected to a membrane filter assembly (400) via a pipeline, a first high-pressure pump (300) is provided on the pipeline between the membrane filter assembly (400) and the security filter (200), a water production outlet of the membrane filter assembly (400) is connected to a cooling water production tank (901) via a pipeline, and the membrane filter assembly (400) is connected to a cooling water production tank (901) via a pipeline. The concentrated water outlet of the first filter element (400) is connected to a temporary storage tank (500) through a pipeline, the temporary storage tank (500) is connected to a raw water storage tank (100) through a pipeline, and a circulating pump (600) is provided on the pipeline between the raw water storage tank (100) and the temporary storage tank (500); the temporary storage tank (500) is connected to a second membrane filter assembly (800) through a pipeline, and a second high-pressure pump (700) is provided on the pipeline between the second membrane filter assembly (800) and the temporary storage tank (500), and the produced water outlet of the second membrane filter assembly (800) is connected to a cooling produced water tank (901) through a pipeline, and the membrane filter assembly (800) is connected to a cooling produced water tank (901) through a pipeline. The concentrated water outlet of the second component (800) is connected to the raw water storage tank (100) through a pipeline; the raw water storage tank (100) and the temporary storage tank (500) are both connected through a cooling assembly (900); the membrane filtration assembly (400) comprises a shell (401), a membrane tube (403) is provided between the top wall and the bottom wall of the shell (401), a feed tube (404) is provided at the bottom of the shell (401), the feed tube (404) is connected to the inside of the membrane tube (403), and the other end of the feed tube (404) is connected to the first high-pressure pump (300), and the shell A drainage pipe (405) is provided at the bottom of the side (401), and the drainage pipe (405) is connected to the cooling water production tank (901); a connecting pipe (406) is provided at the bottom of the shell (401), and the connecting pipe (406) is connected to the inside of the membrane tube (403), and the other end of the connecting pipe (406) is connected to the temporary storage box (500), and a pressure valve (407) is provided on the connecting pipe (406); two groups of concentric hollow tubes (402) are fixed between the top wall and the bottom wall of the shell (401), and the membrane tube (403) is clamped between the two groups of hollow tubes (402).

2. The staged isopropanol waste liquid purification and concentration system according to claim 1 is characterized in that: A heat exchanger is provided in the cooling water production tank; the cooling component (900) comprises a water pump 1 (902), the water pump 1 (902) is located in the cooling water production tank (901), the water outlet end of the water pump 1 (902) is connected to a metal pipe (903), the end of the metal pipe (903) away from the water pump 1 (902) passes through a raw water storage tank (100) and a temporary storage tank (500) and is then connected to the cooling water production tank (901); a spiral portion 1 (904) and a spiral portion 2 (905) are provided on the metal pipe (903), the spiral portion 1 (904) is located in the raw water storage tank (100), and the spiral portion 2 (905) is located in the temporary storage tank (500).

3. The staged isopropanol waste liquid purification and concentration system according to claim 2 is characterized in that: A motor (102) is provided at the top of the raw water storage tank (100); a stirring rod (107) is provided at the output end of the motor (102); the stirring rod (107) is rotatably arranged in the raw water storage tank (100); a plurality of stirring blades (108) are arranged in an array on the surface of the stirring rod (107); an assembly of the stirring rod (107) and the stirring blades (108) is located in the spiral portion (904); a scraper (105) is provided at the bottom of the stirring rod (107); the scraper (105) is in contact with the bottom wall of the raw water storage tank (100); the stirring blade (108) comprises a blade body (1081); the blade body (1081) is arranged on the stirring rod (107); a group of stirring plates (1082) are arranged opposite to each other on the blade body (1081); a guide plate (1083) is protruding from the surface of the stirring plate (1082).

4. The staged isopropanol waste liquid purification and concentration system according to claim 3 is characterized in that: A rear sleeve (109) is sleeved on a position of the stirring rod (107) away from the motor 1 (102), and a plurality of tail stirring blades (110) are circumferentially arranged on the outer circumference of the rear sleeve (109), and the tail stirring blades (110) are located in the raw water storage tank (100); a front sleeve (111) is sleeved on a position of the stirring rod (107) close to the motor 1 (102), and a plurality of front stirring blades (112) are circumferentially arranged on the outer circumference of the front sleeve (111), and the front stirring blades (112) are located in the raw water storage tank (100).

5. The staged isopropanol waste liquid purification and concentration system according to claim 3 is characterized in that: The security filter (200) comprises a filter housing (201), wherein the liquid inlet end of the filter housing (201) is connected to the liquid outlet of the raw water storage tank (100) via a pipeline, and a sealing plate (202) is provided on one side of the filter housing (201), and two groups of slag storage buckets (203) are fixedly provided on the sealing plate (202), and a filter plate (204) is fixedly provided between the two groups of slag storage buckets (203); the interior of the filter housing (201) is filled with filter cotton (205), and the filter cotton (205) is located below the assembly of the slag storage bucket (203) and the filter plate (204); a rotating disk (206) is attached to the top of the filter plate (204), and the rotating disk (206) is fixedly mounted on the bottom end of the stirring rod (107); a slag pushing bar (207) is provided in an array on the edge of the rotating disk (206), and the slag pushing bar (207) is attached to the top of the filter plate (204).

6. The staged isopropanol waste liquid purification and concentration system according to claim 1 is characterized in that: The membrane filtration component 2 (800) comprises a second shell (801), a second feed pipe (804) is provided at the top of the second shell (801), the second feed pipe (804) is connected to the second high-pressure pump (700), a second drain pipe (805) is provided at the bottom of the second shell (801), the second drain pipe (805) is connected to the cooling water production tank (901); a pull-out plate (809) is provided in the sliding seal inside the second shell (801), a second mounting ring (810) is movably provided in the second shell (801), the outer wall surface of the second mounting ring (810) is movably fitted with the inner wall surface of the second shell (801), a second limiting plate (811) is inserted inside the second mounting ring (810), a second ultrafiltration membrane (812) is provided on the top of the second mounting ring (810), and the second mounting ring (810) is provided with a plurality of A liquid guide plate (813) is provided at the bottom of the housing (810), and the second drainage pipe (805) is connected to the interior of the second housing (801) after passing through the pull-out plate (809) and the liquid guide plate (813); a plurality of spheres (814) are fixedly provided on the annular surface of the second mounting ring (810), and the bottom of the spheres (814) is embedded in the pull-out plate (809); at least two first mounting rings (815) are movably stacked in the second housing (801), and the outer wall surface of the first mounting ring (815) is movably fitted with the inner wall surface of the second housing (801), and a first limiting plate (816) is inserted into the interior of the first mounting ring (815), and the top and bottom of the first mounting ring (815) are both provided with a first ultrafiltration membrane (817), and the first mounting ring (815) is located above the second mounting ring (810).

7. The staged isopropanol waste liquid purification and concentration system according to claim 1 is characterized in that: The membrane filtration component 1 (400) is provided with a first pressurizing component (1000) inside; the first pressurizing component (1000) includes a first drive shaft (1001), the first drive shaft (1001) is rotatably connected to the top center of the shell 1 (401), the surface of the first drive shaft (1001) is provided with a first spiral blade (1002), the first spiral blade (1002) is located in the shell 1 (401), and the pitch of the first spiral blade (1002) gradually decreases from bottom to top; a first casing (1003) is fixedly installed on the top of the shell 1 (401), and a loop pipe 1 (1004) is fixedly installed on the side of the first casing (1003), and the loop pipe 1 (1004) at the shell 1 (401) extends downward to between the shell 1 (401) and the hollow tube (402), the A first blade (1005) is provided on the first drive shaft (1001), the first blade (1005) is located in the first housing (1003), and the first blade (1005) is tangent to the inner wall of the first housing (1003); a first cover (1006) is fixedly installed on the top of the first housing (1003), the first housing (1003) is connected to a first venturi tube (1007), the first housing (1003) is connected to the small-diameter end of the first venturi tube (1007), the large-diameter end of the first venturi tube (1007) is provided with a double-control solenoid valve (1008), the double-control solenoid valve (1008) is connected to a second loop pipe (1009), the other end of the second loop pipe (1009) is provided with a second water pump (1010), and the second water pump (1010) is located in a cooling water production tank (901).

8. The staged isopropanol waste liquid purification and concentration system according to claim 6 is characterized in that: The second membrane filtration component (800) is provided with a second pressurizing component (1100) inside; the second pressurizing component (1100) comprises a second drive shaft (1101), the second drive shaft (1101) is rotatably connected to the top center of the second housing (801), a second spiral blade (1102) is provided on the surface of the second drive shaft (1101), the second spiral blade (1102) is located in the second housing (801), and the pitch of the second spiral blade (1102) gradually decreases from top to bottom; a second housing (1103) is fixedly installed on the top of the second housing (801), and a loop pipe (1109) is fixedly installed on the side of the second housing (1103). The second loop pipe (1109) is connected to the second drain pipe (805); the second drive shaft (1101) is provided with a second blade (1105); the second blade (1105) is located in the second housing (1103); the second blade (1105) is tangent to the inner wall of the second housing (1103); a second cover (1106) is fixedly installed on the top of the second housing (1103); the second housing (1103) is connected to a second venturi tube (1107); the second housing (1103) is connected to the small-diameter end of the second venturi tube (1107); the large-diameter end of the second venturi tube (1107) is connected to the double-control solenoid valve (1008).

9. The staged isopropanol waste liquid purification and concentration system according to claim 6 is characterized in that: The membrane pore size on the membrane tube (403) is 0.02µm to 0.1µm; the membrane pore sizes on the first ultrafiltration membrane (817) and the second ultrafiltration membrane (812) are both 0.01µm to 0.08µm; The second shell (801) is connected to a discharge pipe (806), the discharge pipe opening of the discharge pipe (806) is located at the first mounting ring (815) of the upper layer, one end of the discharge pipe (806) away from the second shell (801) is connected to the raw water storage tank (100), and a pressure valve 2 (807) is provided on the discharge pipe (806); the other end of the second drain pipe (805) is connected to a return pipe (808), the return pipe (808) is connected to the first drain pipe (405), and the other end of the return pipe (808) is connected to the cooling water production tank (901); The input end of the circulation pump (600) is connected to a suction pipe (601), the suction pipe (601) passes through the temporary storage box (500) and then extends into the lower half of the temporary storage box (500), and the output end of the circulation pump (600) is connected to a return pipe (602), and the return pipe (602) is connected to the top of the raw water storage tank (100).

10. A staged method for purifying isopropanol waste liquid and concentrating the same, characterized in that: Includes the following step, (S01) The control cabinet controls the motor to rotate, thereby stirring the raw water containing isopropyl alcohol waste liquid in the raw water storage tank; (S02) The control cabinet controls the booster pump to start, and sends the raw water stirred in step (S01) into the security filter; (S03) The control cabinet controls the first high-pressure pump to start, and the filtrate passing through the security filter in step (S02) is sent to the membrane filter assembly 1, the produced water passing through the membrane tube of the membrane filter assembly 1 enters the cooling water tank, and the concentrated water that does not pass through the membrane tube of the membrane filter assembly 1 enters the temporary storage tank; (S04) The control cabinet controls the circulation pump to start, circulating the concentrated water in the temporary storage tank into the raw water storage tank in step (S01); Or the control cabinet controls the second high-pressure pump to start, and the concentrated water in the temporary storage tank is sent to the membrane filtration component 2, and the water produced by the ultrafiltration membrane of the membrane filtration component 2 enters the cooling water production tank, and the concentrated water that does not pass through the ultrafiltration membrane of the membrane filtration component 2 is circulated and sent to the raw water storage tank in step (S01); The pressure generated by the first high-pressure pump is 35 bar to 65 bar; the pressure generated by the second high-pressure pump is 70 bar to 110 bar.

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