A methylamine synthesis rectification purification system

Abstract

The application discloses a kind of methylamine synthesis rectification purification systems, including deaminating unit, extraction unit, dehydration unit, separation unit and environmental protection processing unit, the deaminating unit includes deaminating tower, first overhead condenser, first reflux tank and first kettle liquid cooler;The extraction unit includes extraction tower, second overhead condenser, second reflux tank, second kettle liquid cooler;The separation unit includes first packed rectification column, third overhead condenser and third reflux tank, second packed rectification column, fourth overhead condenser, fourth reflux tank.In the application, excess liquid ammonia in material after synthesis reaction can be effectively removed by cooperation of deaminating tower, first overhead condenser and other equipment, and the influence of ammonia on subsequent product quality is reduced.Two-way design at the outlet of first reflux tank can flexibly control reflux and production, and improve deamination efficiency and material utilization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of methylamine synthesis, and particularly relates to a methylamine synthesis rectification and purification system. BACKGROUND

[0002] In the field of methylamine synthesis, methylamine is an important basic fine organic chemical raw material and is widely used in pesticides, medicines, rubber and other fields. At present, in the synthesis process of methylamine, the design and performance of the rectification and purification system are crucial to product quality, production efficiency and environmental protection benefits.

[0003] The existing methylamine synthesis rectification and purification system has some deficiencies in actual application, for example, the deamination efficiency needs to be improved, the extraction separation effect is not ideal, the material transmission and processing flow between units are not optimized, which leads to unstable product purity and high energy consumption, and at the same time, there are problems such as incomplete treatment of waste gas and waste water in environmental protection treatment, which is difficult to meet the increasingly strict production requirements and environmental protection standards.

[0004] Therefore, it is urgent to design a methylamine synthesis rectification and purification system with more reasonable structure, higher efficiency and better environmental protection performance to overcome the defects of the prior art and improve the overall level of methylamine production. SUMMARY

[0005] In order to solve the problems mentioned in the background art, the present application provides a methylamine synthesis rectification and purification system.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A methylamine synthesis rectification and purification system, comprising a deamination unit, an extraction unit, a dehydration unit, a separation unit and an environmental protection treatment unit, the deamination unit comprising a deamination tower, a first tower top condenser, a first reflux tank and a first kettle liquid cooler;

[0008] The extraction unit comprises an extraction tower, a second tower top condenser, a second reflux tank, a second kettle liquid cooler;

[0009] The separation unit comprises a first packed rectification tower, a third tower top condenser and a third reflux tank, a second packed rectification tower, a fourth tower top condenser, a fourth reflux tank, a side line cooler and a dimethylamine concentration tank;

[0010] The environmental protection treatment unit comprises an atmospheric rectification tower, a fifth tower top condenser, a fifth reflux tank, a first methanol tank, a third kettle liquid cooler, an absorption tower, a tail gas condenser, a tower top buffer tank, a fourth kettle liquid cooler, a tail gas buffer tank and a second methanol tank.

[0011] Preferably, the bottom of the deamination tower, the extraction tower, the first packed distillation tower and the second packed distillation tower are each provided with a reboiler for heating the tower bottom material by steam, the outlet of the first reflux tank is connected to a first reflux pump, the outlet of the pump is divided into two routes: one is connected to the reflux line at the top of the deamination tower, and the other is connected to the extraction line of the azeotrope tank, and the outlet of the first kettle liquid cooler is connected to the feed inlet of the extraction tower.

[0012] Preferably, the bottom of the extraction tower is connected to a second kettle liquid cooler, the outlet of which is connected to the feed inlet of the first packed distillation tower through a pipeline, and the outlet of the second reflux tank is connected to a second reflux pump, the outlet of which is divided into two routes: one is connected to the reflux line at the top of the extraction tower, and the other is connected to the extraction line of the trimethylamine product tank or the mixed amine tank.

[0013] The top of the extraction tower is provided with two water inlets for injecting the extractant water.

[0014] Preferably, the outlet of the third reflux tank is connected to a third reflux pump, the outlet of which is divided into two routes: one is connected to the reflux line at the top of the first packed distillation tower, and the other is connected to the feed inlet of the second packed distillation tower or the kettle liquid tank of the deamination tower through a switchable pipeline; the outlet of the feed kettle of the second packed distillation tower is connected to a heavy component water pipeline, which directly leads to the atmospheric distillation tower of the environmental protection treatment unit.

[0015] Preferably, the outlet of the fourth reflux tank at the top of the second packed distillation tower is connected to a fourth reflux pump, the outlet of which is divided into two routes: one is connected to the reflux line at the top of the second packed distillation tower, and the other is connected to the trimethylamine concentration tank or the mixed amine tank through a switchable pipeline.

[0016] Preferably, the outlet of the side line of the second packed distillation tower is connected to a side line cooler, the outlet of which is divided into two routes: one is refluxed to the middle of the second packed distillation tower, and the other is connected to the dimethylamine concentration tank or the kettle liquid tank of the deamination tower through a switchable pipeline.

[0017] Preferably, the kettle of the second packed distillation tower is provided with a temporary discharge guide, which is connected to the feed inlet of the atmospheric distillation tower through a metal hose.

[0018] Preferably, the liquid phase inlet of the tail gas buffer tank is connected to the venting pipelines of the top of each tower, the tank and the pre-pump filter, and the gas phase outlet is connected to the bottom of the absorption tower.

[0019] The inlet of the top of the absorption tower is connected to the methanol conveying pipeline of the first methanol tank, and the gas phase outlet is connected to the tail gas condenser and the top buffer tank in sequence.

[0020] The bottom of the atmospheric distillation tower is discharged to the sewage treatment tank after being cooled by the third kettle liquid cooler.

[0021] Preferably, the absorption tower's absorption liquid circulating pump inlet is connected to the absorption tower kettle bottom, and the outlet is divided into two routes: the first route returns to the top of the absorption tower through the fourth kettle liquid cooler, and the second route is connected to the second methanol tank for batching.

[0022] Preferably, the deamination tower kettle liquid storage tank outer wall is provided with a steam heating sleeve for maintaining the tank pressure to meet the pump delivery requirements; the storage tank receives unqualified materials from the deamination tower kettle, the first packed rectification tower top, the second packed rectification tower side, and the kettle.

[0023] Compared with the prior art, the beneficial effects of the present application are:

[0024] 1. The deamination unit can effectively remove excess liquid ammonia in the material after the synthesis reaction through the cooperation of the deamination tower, the first tower top condenser and other equipment, reducing the influence of ammonia on the quality of subsequent products. The two-way design of the first reflux tank outlet can flexibly control the reflux and take-out, improving the deamination efficiency and material utilization rate.

[0025] 2. The extraction unit uses water as an extractant, based on the solubility characteristics of trimethylamine in water, to achieve efficient separation of trimethylamine and other components. The qualified trimethylamine taken out of the tower top can be directly used for product preparation or returned to the batching, improving the product yield.

[0026] 3. The first packed rectification tower and the second packed rectification tower in the separation unit, combined with tower top condensers, reflux tanks, side-line coolers and other components, can accurately separate based on the boiling point difference between monomethylamine and dimethylamine. The qualified product directly enters the concentration tank, and the unqualified product can be returned for treatment, ensuring product purity.

[0027] 4. The environmental protection treatment unit uses atmospheric distillation tower, absorption tower and other equipment to treat waste gas and wastewater generated during production, reducing pollutant emissions and meeting environmental protection requirements. The absorption tower uses methanol to absorb ammonia and methylamine in the tail gas, reducing consumption and air pollution.

[0028] 5. The multi-way design of the pump outlet in each unit and the switchable pipeline enable the system to flexibly adjust the material flow direction according to production needs, realize the recycling treatment of unqualified materials, and improve the stability and adaptability of the system.

[0029] 6. The steam heating sleeve on the outer wall of the deamination tower kettle liquid storage tank maintains the tank pressure to ensure normal pumping; the reboilers at the bottoms of the towers heat the kettle materials with steam, reasonably utilize energy, reduce energy consumption, and the system design takes into account the characteristics of the materials and various conditions during production. Through perfect equipment configuration and process design, the safety and stability of the production process are ensured, and the consistency and reliability of product quality are improved.

[0030] 7. The filter realizes multi-stage precise filtration of wastewater through a plurality of parallel filter plates arranged at equal intervals in the filter, can effectively intercept solid impurities of different particle sizes, improve the pretreatment effect, reduce the load of the subsequent wastewater treatment tank, ensure the water quality, and the sealing cover and the filter plate are quickly installed and detached through the locking hook and the plug connector of the quick release device, so that the replacement or cleaning of the filter plate can be completed without complex tools, the maintenance time is greatly shortened, and the operation efficiency of the device is improved.

[0031] 8. The rotating motor drives the scraper to ascend and descend along the surface of the filter plate to actively remove filter residue; the locking plate is adjusted to ascend and descend through the first threaded rod, cooperates with the blowdown hole and the obturator to realize filter residue discharge without disassembling the filter plate, avoids cleaning during shutdown, improves the continuity of the system, the positioning groove and the sealing foot pad ensure the sealing performance during installation of the filter plate to prevent sewage short circuit; the blowdown hole and the connecting rod are cooperatively designed to block the blowdown passage during filtration and open the blowdown during residue cleaning, and the filtration efficiency and residue cleaning convenience are considered, the lifting drive box realizes automatic residue cleaning of the scraper through the motor and the threaded rod, reduces manual operation, and reduces labor intensity; the residue cleaning process can be synchronized with the filtration process to optimize energy consumption distribution and improve the economy of the system. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 Flowchart of the deamination unit, extraction unit, dehydration unit and separation unit of the present application;

[0034] Figure 2 Flowchart of the environmental protection treatment unit of the present application;

[0035] Figure 3 Connection schematic diagram of the atmospheric distillation column and the wastewater treatment tank of the present application;

[0036] Figure 4 Front view of the filter of the present application;

[0037] Figure 5 Sectional view of the filter of the present application;

[0038] Figure 6 Position A in the figure Figure 5 Enlarged detail view of position A in the figure

[0039] Figure 7 Position B in the figure Figure 5 Enlarged detail view of position B in the figure

[0040] Figure: 1, deamination tower; 101, first overhead condenser; 102, first reflux drum; 103, first kettle liquid cooler; 2, extraction tower; 201, second overhead condenser; 202, second reflux drum; 203, second kettle liquid cooler; 3, first packed rectification tower; 301, third overhead condenser; 302, and third reflux drum; 4, second packed rectification tower; 401, fourth overhead condenser; 402, fourth reflux drum; 403, side cooler; 404, dimethylamine concentration tank; 5, atmospheric rectification tower; 501, fifth overhead condenser; 502, fifth reflux drum; 503, first methanol tank; 504, third kettle liquid cooler; 6, absorption tower; 601, tail gas condenser; 602, overhead buffer tank; 603, fourth kettle liquid cooler; 604, tail gas buffer tank; 605, second methanol tank; 7, filter; 701, water inlet; 702, water outlet; 703, blowdown pipe; 704, sealing cover; 705, filter plate; 7051, plug; 706, quick release device; 7061, locking cross bar; 7062, locking hook; 7063, elastic telescopic rod; 707, locking plate; 7071, first threaded rod; 7072, knob; 708, connecting rod; 7081, obturator; 8, lifting drive box; 801, rotary motor; 802, lifting drive plate; 803, lifting drive rod; 804, second threaded rod; 805, scraper; 9, sewage treatment tank. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0042] Embodiment 1

[0043] Reference Figures 1-7 A methanamine synthesis rectification purification system, comprising a deamination unit, an extraction unit, a dehydration unit, a separation unit, and an environmental protection treatment unit, methanol, liquid ammonia, azeotrope, and mixed amine are mixed in proportion, then heated to 125℃ by a low-temperature heat exchanger, then heated to 140℃ by a start-up vaporizer, and finally heated to 380℃-385℃ by an electric heating furnace, and then enter a synthesis tower to react under the action of a catalyst at 380℃ and 4.0MPaG to generate crude amine gas, after condensation, the reaction liquid enters the deamination tower 1.

[0044] Because the synthesis reaction is an exothermic reaction, in order to balance the reaction temperature, excess liquid ammonia is added during the chemical reaction. Because ammonia has the smallest specific gravity compared with the three methylamines, and because the presence of ammonia seriously affects the product quality of the three methylamines, the liquid ammonia after the reaction of the system is first removed. The deamination unit includes a deamination tower 1, a first tower top condenser 101, a first reflux tank 102, and a first kettle liquid cooler 103. The deamination tower 1 has two feed inlets, and an outlet pipeline of an amine mixing metering pump is connected to the feed pipe. This pipeline is a material carrying pipeline, which can carry the materials in the unqualified tank of the batching system into the deamination tower 1 for rectification (usually not used).

[0045] The extraction tower 2 is provided with two water inlets at the top for injecting the extractant water. The extraction unit includes the extraction tower 2, a second tower top condenser 201, a second reflux tank 202, and a second kettle liquid cooler 203. The extraction tower 2 uses water as an extractant to separate the trimethylamine with the smallest solubility from other components. The qualified trimethylamine is distilled from the top to go to the finished product preparation post or return to the amine mixing tank for re-batching. Other components are discharged from the tower kettle to the first packed rectification tower 3. According to the property that the solubility of trimethylamine in the extractant water is 0 under certain temperature and pressure, water is used as an extractant to separate trimethylamine from amine mixture.

[0046] The separation unit includes the first packed rectification tower 3, a third tower top condenser 301, and a third reflux tank 302, the second packed rectification tower 4, a fourth tower top condenser 401, a fourth reflux tank 402, a side line cooler 403, and a dimethylamine concentration tank 404.

[0047] The material enters the first packed rectification tower 3 and is heated by a tower bottom reboiler. The insoluble gaseous monomethylamine and dimethylamine are distilled from the top as light components in a liquid phase through the third tower top condenser 301 and into the third reflux tank 302. The heavy components of the material heated by the tower bottom of the first packed rectification tower 3 are mostly water, which goes to the atmospheric rectification tower 5 for environmental protection treatment.

[0048] The environmental protection treatment unit includes the atmospheric rectification tower 5, a fifth tower top condenser 501, a fifth reflux tank 502, a first methanol tank 503, a third kettle liquid cooler 504, an absorption tower 6, a tail gas condenser 601, a tower top buffer tank 602, a fourth kettle liquid cooler 603, a tail gas buffer tank 604, and a second methanol tank 605.

[0049] The atmospheric rectification tower 5 has two feed inlets. The material is heated by a tower bottom reboiler steam. The insoluble gaseous ammonia, methanol, monomethylamine, dimethylamine, and water containing 40% are distilled from the top, cooled by the fifth tower top condenser 501, and enter the fifth reflux tank 502. Part of the reflux and part of the sample go to the first methanol tank 503.

[0050] The absorption tower 6 continuously receives methanol from the first methanol tank 503, absorbs ammonia and methylamine in the system vent gas with the methanol, thereby reducing consumption and reducing air pollution, and the trace amount of gas not absorbed is discharged into the atmosphere through the tail gas condenser 601, and the absorbed methanol absorption liquid is partially recycled and partially sent to the second methanol tank 605 for use by the batching post, and the tower bottom is cooled by the kettle liquid cooler and then discharged to the sewage treatment system.

[0051] Among them, the bottom of the deamination tower 1, the extraction tower 2, the first packed rectification tower 3 and the second packed rectification tower 4 is provided with a reboiler, the kettle material is heated by steam, the outlet of the first reflux tank 102 is connected with the first reflux pump, the outlet of the pump is divided into two routes: one route is connected with the reflux pipeline at the top of the deamination tower 1, and the other route is connected with the extraction pipeline of the azeotrope storage tank, and the outlet of the first kettle liquid cooler 103 is connected with the feed inlet of the extraction tower 2.

[0052] Among them, the bottom of the extraction tower 2 is connected with the second kettle liquid cooler 203, the outlet of which is connected with the feed inlet of the first packed rectification tower 3 through a pipeline, and the outlet of the second reflux tank 202 is connected with the second reflux pump, the outlet of the pump is divided into two routes: one route is connected with the reflux pipeline at the top of the extraction tower 2, and the other route is connected with the extraction pipeline of the trimethylamine product tank or the mixed amine tank.

[0053] Among them, the outlet of the third reflux tank 302 is connected with the third reflux pump, the outlet of the pump is divided into two routes: one route is connected with the reflux pipeline at the top of the first packed rectification tower 3, and the other route is connected with the feed inlet of the second packed rectification tower 4 or the kettle liquid storage tank of the deamination tower 1 through a switchable pipeline, when the material extracted by the third reflux tank 302 is unqualified, the kettle liquid storage tank of the deamination tower 1 is selected, and after replacement, the second packed rectification tower 4 is selected.

[0054] The inlet of the second packed rectification tower 4 is connected with the heavy component water pipeline, which directly leads to the atmospheric distillation tower 5 of the environmental protection treatment unit.

[0055] Among them, the outlet of the fourth reflux tank 402 at the top of the second packed rectification tower 4 is connected with the fourth reflux pump, the outlet of the pump is divided into two routes: one route is connected with the reflux pipeline at the top of the second packed rectification tower 4, and the other route is connected with the monomethylamine concentrated tank or the mixed amine tank through a switchable pipeline, the outlet of the side line cooler 403 connected with the side line extraction outlet of the second packed rectification tower 4 is divided into two routes: one route is refluxed to the middle part of the second packed rectification tower 4, and the other route is connected with the dimethylamine concentrated tank 404 or the kettle liquid storage tank of the deamination tower 1 through a switchable pipeline, and the kettle kettle of the second packed rectification tower 4 is provided with a temporary discharge guide, which is connected with the feed inlet of the atmospheric distillation tower 5 through a metal hose;

[0056] The second packed rectification tower 4 rectifies the distillate from the top of the first packed rectification tower 3 according to the boiling point difference of dimethylamine, monomethylamine is taken from the top, dimethylamine is taken from the side line, qualified products go to the concentration tank, unqualified products return to the batching or go to the kettle liquid tank of the deamination tower 1, and are rectified again. According to the production situation, if the water content in the kettle exceeds the standard, the kettle liquid is discharged through a temporary hose for multiple times to the atmospheric distillation tower 5 for treatment.

[0057] The liquid phase inlet of the tail gas buffer tank 604 is connected with the overhead venting, the tank venting and the pump pre-filter venting pipelines of the system, and the gas phase outlet is connected with the bottom of the absorption tower 6;

[0058] The top inlet of the absorption tower 6 is connected with the methanol conveying pipe of the first methanol tank 503, and the gas phase outlet is connected with the tail gas condenser 601 and the tower top buffer tank 602 in sequence;

[0059] The bottom of the atmospheric distillation tower 5 is cooled by the third kettle liquid cooler 504 and then discharged to the sewage treatment tank 9.

[0060] The inlet of the absorption liquid circulating pump of the absorption tower 6 is connected with the kettle bottom of the absorption tower 6, and the outlet is divided into two routes: the first route returns to the top of the absorption tower 6 through the fourth kettle liquid cooler 603, and the second route is connected with the second methanol tank 605 for batching.

[0061] The kettle liquid tank of the deamination tower 1 is provided with a steam heating sleeve on the outer wall, which is mainly used for heating the materials in the tank to increase the pressure, so that the pressure of the pump inlet can be reached to maintain the pressure in the tank to meet the pumping requirements. The tank receives unqualified materials from the kettle of the deamination tower 1, the top of the first packed rectification tower 3, the side of the second packed rectification tower 4 and the kettle.

[0062] Example 2

[0063] Reference Figures 1-7 The difference between the present embodiment and example 1 is that the liquid inlet of the sewage treatment tank 9 is provided with a filter 7, a sealing cover 704 is detachably installed at the top end of the filter 7, a water inlet 701 and a water outlet 702 are respectively arranged at the two sides of the filter 7, a plurality of filter plates 705 are detachably installed between the water inlet 701 and the water outlet 702 in the interior of the filter 7, the plurality of filter plates 705 are arranged in parallel at equal intervals, a locking plate 707 is installed at the position close to the bottom end in the interior of the filter 7, a first threaded rod 7071 is rotatably installed at the bottom end of the locking plate 707, and the bottom end of the first threaded rod 7071 extends to the outside of the filter 7.

[0064] In order to pretreat the tower kettle wastewater, solid waste is pre-filtered, a filter 7 is arranged at the liquid inlet position of the sewage treatment tank 9, the sewage is filtered by multiple filter plates 705, and finally discharged from the water outlet 702. After multi-stage filtration, solid waste can be filtered more fully, reducing the pressure of subsequent treatment;

[0065] The top end of the locking plate 707 is provided with a plurality of positioning grooves, and the plurality of positioning grooves correspond to the plurality of filter plates 705 one by one. A sealing foot pad is arranged in the positioning groove. A plurality of blowdown holes are arranged on the locking plate 707, and the blowdown holes are located between adjacent filter plates 705. A plurality of connecting rods 708 are fixed to the inner wall of the bottom end of the filter 7. The diameter of the connecting rod 708 is smaller than the diameter of the blowdown hole. The top end of the connecting rod 708 penetrates the locking plate 707 through the blowdown hole, and the top end of the connecting rod 708 is fixed with a plugging device 7081. The diameter of the plugging device 7081 is larger than the diameter of the blowdown hole. The bottom end of the first threaded rod 7071 is fixed with a knob 7072. The bottom end of the filter 7 is provided with a blowdown pipe 703.

[0066] The sealing cover 704 is fixed to the top end of the filter 7 by bolts. The filter plate 705 can be installed and removed by removing the sealing cover 704, which facilitates the replacement and maintenance of the filter plate 705. The filter plate 705 is installed below the sealing cover 704. After the sealing cover 704 is closed, the filter plate 705 is aligned with the positioning groove at the top end of the locking plate 707. The first threaded rod 7071 is twisted by the knob 7072, so that the locking plate 707 can be lifted and moved. Then the locking plate 707 tightly abuts against the bottom end of the filter plate 705, ensuring the stability of the installation of the filter plate 705 and ensuring that the filter plate 705 will not be dislocated to produce gaps due to water pressure impact during the filtering process. It can be ensured that the sewage can only pass through each filter plate 705 step by step, improving the filtering effect. When the first threaded rod 7071 is rotated in the opposite direction, the locking plate 707 will separate from the bottom end of the filter plate 705, and the blowdown hole will separate from the plugging device 7081. In the separated state, the solid waste filtered between the adjacent filter plates 705 can be discharged downward from the blowdown hole and discharged to the outside of the filter 7 through the blowdown pipe 703. During the filtering process, the sewage enters from the water inlet 701 and exits from the water outlet 702. When backwashing, the locking plate 707 tightly contacts the filter plate 705, and then the washing liquid enters from the water outlet 702 and exits from the water inlet 701, so as to wash down the filter residue adhered to one side of the filter plate 705. Then the locking plate 707 is driven to move downward, so as to switch to the blowdown state. The filter residue between the adjacent filter plates 705 can be conveniently discharged, and the sealing property in the filtering state can be ensured, so as to ensure the multi-stage filtering effect.

[0067] The inside of the sealing cover 704 is provided with a quick release device 706, the bottom end of the quick release device 706 is provided with a plug-in hole, the top end of the filter plate 705 is provided with a plug-in head 7051, the plug-in head 7051 extends to the inside of the quick release device 706 through the plug-in hole, the inside of the quick release device 706 is provided with a locking cross strip 7061, the bottom end of the locking cross strip 7061 is fixed with a plurality of locking hooks 7062, the top end of the plug-in head 7051 is provided with a hanging groove corresponding to the locking hook 7062 on one side, and the locking cross strip 7061 is fixed on the telescopic end of the elastic telescopic rod 7063.

[0068] The elastic telescopic rod 7063 is compressed, and the locking cross strip 7061 is pulled to move horizontally, so that the plurality of locking hooks 7062 are synchronously moved and separated from the hanging groove, the locking cross strip 7061 is released, the elastic force of the elastic telescopic rod 7063 pushes the locking hook 7062 to be inserted into the hanging groove, the purpose of quickly disassembling the filter plate 705 is achieved, the locking plate 707 is pressed upward to position, and the installation and fixation of the filter plate 705 are completed.

[0069] The top end of the filter 7 is fixed with a lifting drive box 8, the top end of the lifting drive box 8 is fixed with a rotating motor 801, the lifting drive box 8 is movably provided with a lifting drive plate 802, the lifting drive box 8 is further rotatably provided with a second threaded rod 804, the output shaft of the rotating motor 801 is fixed with the second threaded rod 804, the second threaded rod 804 penetrates the lifting drive plate 802 through a threaded hole, the bottom end of the lifting drive plate 802 is fixed with a plurality of lifting drive rods 803, the bottom end of the lifting drive rod 803 movably extends between adjacent filter plates 705, and is fixed with a scraper 805.

[0070] The rotating motor 801 drives the second threaded rod 804 to rotate, so that the lifting drive plate 802 is lifted and moved, and the lifting drive rod 803 and the scraper 805 are lifted and moved, so that the surface of the filter plate 705 is actively scraped, and the efficiency of cleaning the filter residue is further improved.

[0071] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0072] In this application, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and other terms should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0073] The control mode of the present application is automatically controlled by the controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art, the power supply also belongs to the common knowledge in the art, and the present application is mainly used to protect the mechanical device, so the control mode and the circuit connection of the present application will not be explained in detail.

[0074] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A methylamine synthesis distillation purification system, comprising a deammoniation unit, an extraction unit, a dehydration unit, a separation unit, and an environmental protection treatment unit, characterized in that: The ammonia removal unit includes an ammonia removal tower (1), a first tower top condenser (101), a first reflux tank (102), and a first bottom liquid cooler (103). The extraction unit includes an extraction tower (2), a second top condenser (201), a second reflux tank (202), and a second bottom liquid cooler (203). The separation unit includes a first packed distillation column (3), a third overhead condenser (301) and a third reflux tank (302), a second packed distillation column (4), a fourth overhead condenser (401), a fourth reflux tank (402), a side stream cooler (403) and a dimethylamine concentration tank (404). The environmental protection treatment unit includes an atmospheric distillation column (5), a fifth column top condenser (501), a fifth reflux tank (502), a first methanol tank (503), a third bottom liquid cooler (504), an absorption column (6), a tail gas condenser (601), a column top buffer tank (602), a fourth bottom liquid cooler (603), a tail gas buffer tank (604), and a second methanol tank (605). The bottom of the atmospheric distillation column (5) is cooled by the third reactor liquid cooler (504) and discharged to the sewage treatment tank (9). The sewage treatment tank (9) is equipped with a filter (7) at the inlet. The top of the filter (7) is detachably equipped with a sealing cap (704). The filter (7) is equipped with an inlet (701) and an outlet (702) on both sides. The filter (7) is equipped with multiple filter plates (705) detachably installed between the inlet (701) and the outlet (702). The multiple filter plates (705) are arranged parallel to each other at equal intervals. The filter (7) is equipped with a locking plate (707) near the bottom. The bottom of the locking plate (707) is rotatably equipped with a first threaded rod (7071). The bottom of the first threaded rod (7071) extends to the outside of the filter (7). The top of the locking plate (707) is provided with multiple positioning grooves, and the multiple positioning grooves correspond one-to-one with multiple filter plates (705). The positioning grooves are provided with sealing pads, and the locking plate (707) is provided with multiple drain holes, which are located between adjacent filter plates (705). Multiple connecting rods (708) are fixed on the inner wall of the bottom end of the filter (7). The diameter of the connecting rods (708) is smaller than the diameter of the drain holes, and the top of the connecting rods (708) passes through the drain holes and penetrates the locking plate (707). A plug (7081) is fixed on the top of the connecting rods (708). The diameter of the plug (7081) is larger than the diameter of the drain holes. A knob (7072) is fixed on the bottom end of the first threaded rod (7071), and a drain pipe (703) is installed on the bottom end of the filter (7).

2. The methylamine synthesis distillation purification system according to claim 1, characterized in that: The bottom of the deammoniation tower (1), extraction tower (2), first packed distillation tower (3) and second packed distillation tower (4) are all equipped with reboilers to heat the bottom material of the towers with steam. The outlet of the first reflux tank (102) is connected to the first reflux pump. The outlet of the pump is divided into two paths: one path is connected to the reflux pipeline at the top of the deammoniation tower (1), and the other path is connected to the outlet pipeline of the azeotropic storage tank. The outlet of the first bottom liquid cooler (103) is connected to the feed port of the extraction tower (2).

3. The methylamine synthesis distillation and purification system according to claim 1, characterized in that: The bottom of the extraction tower (2) is connected to the second kettle liquid cooler (203), and its outlet is connected to the feed port of the first packed distillation tower (3) through a pipeline. The outlet of the second reflux tank (202) is connected to the second reflux pump. The outlet of the pump is divided into two paths: one path is connected to the reflux pipeline at the top of the extraction tower (2), and the other path is connected to the outlet pipeline of the trimethylamine product tank or the mixed amine tank. The top of the extraction tower (2) is equipped with two water inlets for injecting extractant water.

4. The methylamine synthesis distillation purification system according to claim 1, characterized in that: The outlet of the third reflux tank (302) is connected to the third reflux pump. The outlet of the pump is divided into two paths: one path is connected to the reflux pipeline at the top of the first packed distillation column (3), and the other path is connected to the feed inlet of the second packed distillation column (4) or the bottom liquid storage tank of the deammoniation column (1) through a switchable pipeline. The bottom outlet of the second packed distillation column (4) is connected to the heavy weight water separation pipeline, which leads directly to the atmospheric pressure distillation column (5) of the environmental protection treatment unit.

5. The methylamine synthesis distillation and purification system according to claim 4, characterized in that: The outlet of the fourth reflux tank (402) at the top of the second packed distillation column (4) is connected to the fourth reflux pump. The outlet of the pump is divided into two paths: one path is connected to the reflux line at the top of the second packed distillation column (4), and the other path is connected to a methylamine concentration tank or a mixed amine tank through a switchable pipeline.

6. The methylamine synthesis distillation and purification system according to claim 5, characterized in that: The side outlet of the second packed distillation column (4) is connected to the side cooler (403). The outlet of the cooler is divided into two paths: one path flows back to the middle of the second packed distillation column (4), and the other path is connected to the dimethylamine concentration tank (404) or the bottom liquid storage tank of the deammoniation column (1) through a switchable pipeline.

7. The methylamine synthesis distillation and purification system according to claim 5, characterized in that: The second packed distillation column (4) is equipped with a temporary discharge guide, which is connected to the feed port of the atmospheric distillation column (5) through a metal hose.

8. The methylamine synthesis distillation purification system according to claim 7, characterized in that: The liquid phase inlet of the tail gas buffer tank (604) is connected to the venting lines of each tower top, storage tank and pump front filter of the system, and the gas phase outlet is connected to the bottom of the absorption tower (6). The top inlet of the absorption tower (6) is connected to the methanol delivery pipe of the first methanol tank (503), and the top gas phase outlet is connected in sequence to the tail gas condenser (601) and the top buffer tank (602).

9. The methylamine synthesis distillation and purification system according to claim 8, characterized in that: The inlet of the absorption liquid circulation pump of the absorption tower (6) is connected to the bottom of the absorption tower (6), and the outlet is divided into two paths: the first path returns to the top of the absorption tower (6) through the fourth reactor liquid cooler (603), and the second path is connected to the second methanol tank (605) for batching.

10. The methylamine synthesis distillation purification system according to claim 9, characterized in that: The outer wall of the deammoniation tower (1) bottom liquid storage tank is equipped with a steam heating sleeve to maintain the pressure inside the tank to meet the pump delivery requirements; the storage tank receives unqualified materials from the bottom of the deammoniation tower (1), the top of the first packed distillation tower (3), the side of the second packed distillation tower (4), and the bottom of the tower.

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