Polycarbonate solution thermal stability concentration energy-saving system

Abstract

The utility model discloses a polycarbonate solution thermostable concentration energy-saving system which comprises a feed delivery pump and a feed concentration tank, the output end of the feed delivery pump is connected with the feed concentration tank through a pipeline, the polycarbonate solution thermostable concentration energy-saving system further comprises a concentration circulating pump and a concentration heater, the bottom end of the feed concentration tank is connected with the concentration circulating pump through a pipeline, and the concentration heater is connected with the feed delivery pump through a pipeline. The concentration circulating pump is connected with a concentration heater through a pipeline, and the concentration heater is connected with the feeding concentration tank through a pipeline; when the dichloromethane solution needs to be concentrated, the PC dichloromethane solution with lower concentration is conveyed into the feeding concentration tank through the feeding conveying pump, and the dichloromethane solution is concentrated and concentrated through the feeding concentration tank, the concentration heater and the concentration circulating pump; and the concentrated dichloromethane solution with higher concentration is conveyed into the double-paddle evaporator by the double-paddle feeding pump, so that the high-concentration dichloromethane solution is obtained, and the concentration efficiency of the dichloromethane solution is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polycarbonate solution concentration, in particular to a polycarbonate solution heat-stabilizing concentration energy-saving system. Background Art

[0002] As is well known, polycarbonate solvent, also known as polyester solvent, is a highly efficient aromatic hydrocarbon solvent. Polycarbonate solvent has the characteristics of low toxicity, low evaporation, non-irritation, stability, limited decomposition and recovery. Polycarbonate solvent can be used in coatings, inks, lubricants, plastics, rubber, detergents, fungicides, adhesives and pharmaceuticals.

[0003] For example, the patent with announcement number CN212758520U and announcement date of March 21, 2021, and titled "Butyl acrylate dimer cracking catalyst stable feeding system", this utility model belongs to the field of butyl acrylate dimer cracking, and specifically relates to a butyl acrylate dimer cracking catalyst stable feeding system. The butyl acrylate dimer cracking catalyst stable feeding system described in the utility model includes a catalyst dissolving tank, the top of which is respectively provided with a catalyst addition port, an acrylic acid filling pipeline, and an inhibitor addition port, the bottom of the catalyst dissolving tank is connected to a heat exchanger, a catalyst feeding pump, and a butyl acrylate dimer cracking kettle in sequence; the butyl acrylate dimer cracking kettle is connected to a butyl acrylate dimer input pipeline; the bottom of the catalyst dissolving tank is also connected to a heat exchanger and a butyl acrylate dimer cracking kettle in sequence; the utility model is simple to operate, has a stable feed ratio, saves catalyst usage, increases the output of butyl acrylate dimer cracking, and is safe and energy-saving.

[0004] In the prior art, when dichloromethane solution is concentrated, distillation is mostly used for the concentration. However, the distillation method for concentrating dichloromethane solution is relatively inefficient and not conducive to mass production. Utility Model Content

[0005] The purpose of the utility model is to provide a polycarbonate solution heat stabilization concentration energy-saving system to solve the above-mentioned problems in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a polycarbonate solution thermal stabilization concentration and energy-saving system, comprising a feed delivery pump and a feed concentration tank, wherein the output end of the feed delivery pump is connected to the feed concentration tank through a pipeline, and further comprising a concentration circulation pump and a concentration heater, wherein the bottom end of the feed concentration tank is connected to the concentration circulation pump through a pipeline, and the concentration circulation pump is connected to the concentration heater through a pipeline, and the concentration heater and the feed concentration tank are connected through a pipeline.

[0007] As mentioned above, the output end of the feed delivery pump is connected to the first filter, and the first filter and the feed concentration tank are connected through a pipeline.

[0008] As mentioned above, the end of the feed delivery pump is connected to a feed buffer tank, and the top of the feed buffer tank is provided with a first condenser.

[0009] As mentioned above, a second condenser is provided at the top of the feed concentration tank, a recovery tank is connected to the second condenser, and a cooling water supply pipe and a cooling water return pipe are respectively connected to the second condenser.

[0010] As mentioned above, the gas phase outlet of the first condenser is connected to the gas phase outlet of the third condenser through a pipeline, the second condenser is connected to the gas phase outlet of the third condenser through a pipeline, the third condenser is connected to the recovery condenser through a pipeline, and the third condenser is also connected to an air inlet channel.

[0011] As mentioned above, the third condenser is connected to a chilled water return pipe, and the third condenser is also connected to a chilled water supply pipe.

[0012] As mentioned above, the concentration heater is connected to a water recovery device, and the concentration heater is also connected to a PC drying system.

[0013] As mentioned above, the feed concentration tank is also connected in sequence to a double-blade feed pump, a second filter and a double-blade liquid evaporator.

[0014] As mentioned above, the feed buffer tank is connected to a feed mixer for conveying dichloromethane solution.

[0015] As mentioned above, the feed mixer is connected to an auxiliary buffer tank, the auxiliary buffer tank is connected to a third filter, the third filter is connected to a pouring pump, the pouring pump is connected to an auxiliary mixing tank, the auxiliary mixing tank is connected to the third condenser, the top of the auxiliary mixing tank is connected to a lower hopper, and a stirrer is provided in the auxiliary buffer tank and the auxiliary mixing tank.

[0016] The beneficial effects of the utility model are as follows: when the dichloromethane solution needs to be concentrated, the PC dichloromethane solution with a lower concentration is transported to the bottom pipeline of the feed concentration tank by the feed delivery pump, the dichloromethane solution is concentrated and concentrated by the feed concentration tank, the concentration heater and the concentration circulation pump, the concentrated dichloromethane solution is transported to the de-double-blade evaporator by the double-blade feed pump with a higher concentration of the dichloromethane solution to obtain a pure high-concentration dichloromethane solution, the concentration is carried out in the feed concentration tank, the dichloromethane solution is circulated and transported to the feed concentration tank by the concentration circulation pump for concentration, and the dichloromethane solution is concentrated by the feed concentration tank and the concentration heater, thereby improving the concentration efficiency of the dichloromethane solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 This is a process flow chart of the utility model;

[0019] Figure 2 A schematic diagram of a partial three-dimensional structure of another embodiment provided by the utility model;

[0020] Figure 3 For this utility model Figure 2 A schematic diagram of a partial cross-sectional structure of the second liquid discharge pipe;

[0021] Figure 4 For this utility model Figure 2 A schematic diagram of a partial cross-sectional structure of the first liquid inlet pipe position;

[0022] Figure 5 This is a schematic diagram of the partial three-dimensional structure of the interior of the tank of the utility model;

[0023] Figure 6 It is a schematic diagram of the partial cross-sectional structure of the spiral plate of the utility model.

[0024] Description of reference numerals:

[0025] 1. Delivery pump; 2. Feed concentration tank; 3. Concentration circulation pump; 4. Concentration heater; 5. First filter; 6. Water recovery and treatment device; 7. PC drying system; 8. Double-blade feed pump; 9. Second filter; 10. Double-blade liquid evaporator; 11. Feed buffer tank; 12. First condenser; 13. Second condenser; 14. Recovery tank; 15. Cooling water supply pipe; 16. Cooling water return pipe; 17. Third condenser; 18 , to the recovery condenser; 19, air inlet channel; 20, chilled water return pipe; 21, chilled water supply pipe; 22, feed mixer; 23, auxiliary buffer tank; 24, third filter; 25, pouring pump; 26, auxiliary mixing tank; 27, lower hopper; 28, tank body; 29, spiral plate; 30, liquid inlet channel; 31, spiral channel; 32, first liquid inlet pipe; 33, first liquid discharge pipe; 34, second liquid discharge pipe; 35, second liquid inlet pipe. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] In the utility model, various parts (such as: between tank bodies, between tank bodies and condensers, between condensers and condensers, and between tank bodies and filters, etc.) are connected by pipes, and materials (such as dichloromethane solution, gas or hot water) are transported through the pipes.

[0028] like Figures 1 to 6 As shown, an energy-saving system for heat-stabilizing and concentrating a polycarbonate solution provided by an embodiment of the present invention includes a feed delivery pump 1 and a feed concentration tank 2. The output end of the feed delivery pump 1 is connected to the feed concentration tank 2 through a pipeline. It is characterized in that it also includes a concentration circulation pump 3 and a concentration heater 4. The bottom end of the feed concentration tank 2 is connected to the concentration circulation pump 3 through a pipeline, and the concentration circulation pump 3 is connected to the concentration heater 4 through a pipeline. The concentration heater 4 and the feed concentration tank 2 are connected through a pipeline.

[0029] Specifically, the thermal stability concentration of the polycarbonate solution is a process of concentrating a PC dichloromethane solution with a low concentration through a heat exchange process to obtain a PC dichloromethane solution with a high concentration. The feed delivery pump 1 is a pump body for delivering the dichloromethane solution, the feed concentration tank 2 is a tank-shaped body for concentrating the PC dichloromethane solution with a low concentration, the concentration circulation pump 3 is a pump body for circulating the PC dichloromethane solution, the concentration heater 4 is a device for heating the PC dichloromethane solution, the output end of the feed delivery pump 1 is connected to a first filter 5, the first filter 5 and the feed concentration tank 2 are connected by a pipeline, and the first filter 5 can circulate the dichloromethane solution. The filtration treatment is carried out, the concentration heater 4 is connected to the water recovery treatment device 6, the concentration heater 4 is also connected to the PC drying system 7, the feed concentration tank 2 is also connected in sequence with a double-blade feed pump 8, a second filter 9 and a double-blade liquid evaporator 10, and the double-blade liquid evaporator 10 is a device for evaporating and purifying the dichloromethane solution. When the dichloromethane solution needs to be concentrated, the PC dichloromethane solution with a lower concentration is transported to the feed concentration tank 2 through the feed delivery pump 1, and the dichloromethane solution is filtered through the first filter 5, so that the dichloromethane solution entering the feed concentration tank 2 is relatively pure, and the dichloromethane solution is concentrated by the feed concentration tank 2. The dichloromethane solution in the feed concentration tank 2 is transported to the second filter 9 by the double-blade feed pump 8, and the dichloromethane solution is filtered by the second filter 9. The dichloromethane solution after being filtered by the second filter 9 enters the double-blade liquid evaporator 10, and the dichloromethane solution is purified by the double-blade liquid evaporator 10 to obtain a pure high-concentration dichloromethane solution. The concentration circulation pump 3 transports the dichloromethane solution to the concentration heater 4, and the concentration heater 4 heats the dichloromethane solution with a lower concentration to evaporate the dichloromethane solution with a lower concentration. The water evaporated in the concentration heater 4 flows into the dewatering recovery treatment device 6. Water is recovered and processed, and the dichloromethane solution is concentrated and concentrated by the feed concentration tank 2, the concentration heater 4 and the concentration circulation pump 3, thereby improving the concentration efficiency of the dichloromethane solution. The hot water used in the concentration heater 4 is recovered and processed by the dewatering recovery treatment device 6, and the hot water in the concentration heater 4 is recovered and reused. The PC drying system 7 can reuse the hot water in the dewatering recovery treatment device 6. The hot water recovered in the dewatering recovery treatment device 6 is transported to the concentration heater 4 through the PC drying system 7, so that the concentration heater 4 heats the dichloromethane solution and can reuse the hot water, thereby achieving the effect of energy saving in concentrating the dichloromethane solution.

[0030] In the prior art, when dichloromethane solution is concentrated, distillation is mostly used for the concentration. However, the distillation method for concentrating dichloromethane solution is relatively inefficient and not conducive to mass production.

[0031] The beneficial effect of this embodiment is that when the dichloromethane solution needs to be concentrated, the PC dichloromethane solution with a lower concentration is transported to the bottom pipeline of the feed concentration tank 2 by the feed delivery pump 1, and the dichloromethane solution is concentrated and concentrated by the feed concentration tank 2, the concentration heater 4 and the concentration circulation pump 3. The concentrated dichloromethane solution is transported to the double-blade evaporator by the double-blade feed pump 8 with a higher concentration of dichloromethane to obtain a pure high-concentration dichloromethane solution, which is concentrated in the feed concentration tank 2. The dichloromethane solution is circulated and transported to the feed concentration tank 2 by the concentration circulation pump 3 for concentration, and the dichloromethane solution is concentrated and concentrated by the feed concentration tank 2, the concentration heater 4 and the concentration circulation pump 3, thereby improving the concentration efficiency of the dichloromethane solution.

[0032] Furthermore, the end of the feed delivery pump 1 is connected to a feed buffer tank 11, and a first condenser 12 is provided at the top of the feed buffer tank 11; a second condenser 13 is provided at the top of the feed concentration tank 2, and a recovery tank 14 is connected to the second condenser 13, and a cooling water supply pipe 15 and a cooling water return pipe 16 are respectively connected to the first condenser 12; the gas phase outlet of the first condenser is connected to the gas phase outlet of the third condenser 17 through a pipeline, and the second condenser 13 is connected to the gas phase outlet of the third condenser 17 through a pipeline, and the third condenser 17 is connected to the recovery condenser 18 through a pipeline, and the third condenser 17 is also connected to the feed air channel 19; the third condenser 17 is connected to a chilled water return pipe 20, and the third condenser 17 is also connected to a chilled water supply pipe 21; the feed buffer tank 11 is connected to a feed mixer 22 for conveying dichloromethane solution; the feed mixer 22 is connected to an auxiliary buffer tank 23, the auxiliary buffer tank 23 is connected to a third filter 24, the third filter 24 is connected to a pouring pump 25, the pouring pump 25 is connected to an auxiliary mixing tank 26, the auxiliary mixing tank 26 is connected to the third condenser 17, the top of the auxiliary mixing tank 26 is connected to a lower hopper 27, and a stirrer is provided in the auxiliary buffer tank 23 and the auxiliary mixing tank 26.

[0033] Specifically, the air inlet channel 19 is used to transport nitrogen, the first condenser 12 can condense the gas-liquid mixture discharged from the feed buffer tank 11, the second condenser 13 can condense the gas-liquid mixture discharged from the feed concentration tank 2, the recovery tank 14 recycles the condensed material in the first condenser 12, and the second condenser 13 is respectively connected to a cooling water supply pipe 15 and a cooling water return pipe 16, so that the cooling water return pipe 16 and the cooling water supply pipe 15 provide cooling materials for the second condenser 13, and the third condenser 17 condenses the gas-liquid mixture generated in the auxiliary buffer tank 23 and the deployment tank. The condensed water in the first condenser 12 and the third condenser 17 is collected through the chilled water return pipe 20, the chilled water supply pipe 21 transports the chilled water to the first condenser 12 and the third condenser 17 respectively, and the cooling water supply pipe 15 transports the circulating cooling water to the second condenser 1 3, and then the cooling water in the second condenser 13 is discharged from the cooling water return pipe 16, and the heat stabilizer is transported to the lower hopper 27, and the lower hopper 27 transports the heat stabilizer to the auxiliary mixing tank 26. The heat stabilizer in the auxiliary mixing tank 26 is transported to the third filter 24 through the backflow pump 25, so that the third filter 24 filters the heat stabilizer. The heat stabilizer filtered by the third filter 24 enters the auxiliary buffer tank 23, and the heat stabilizers in the auxiliary mixing tank 26 and the auxiliary buffer tank 23 are stirred respectively by the agitator. The heat stabilizer and the PC dichloromethane solution with a lower concentration are transported to the feed buffer tank 11 through the feed mixer 22, so that the heat stabilizer and the PC dichloromethane solution with a lower concentration can be mixed, so that the heat stabilizer and the PC dichloromethane solution with a lower concentration can enter the feed concentration tank 2 for concentration treatment, thereby achieving a stable concentration effect of the dichloromethane solution.

[0034] In another embodiment provided by the present invention, the concentration heater 4 includes a tank body 28, a spiral plate 29 is provided inside the tank body 28, the spiral part of the spiral plate 29 is a liquid inlet channel 30, and a spiral channel 31 is provided inside the spiral plate 29 along its spiral trajectory, a first liquid inlet pipe 32 is provided on the side wall of the tank body 28, a first liquid discharge pipe 33 is provided at the top of the tank body 28, the first liquid inlet pipe 32 is connected to the outer end of the liquid inlet channel 30, the first liquid discharge pipe 33 is connected to the top side of the inner end of the liquid inlet channel 30, a second liquid discharge pipe 34 is provided on the side wall of the tank body 28, in the circumferential direction of the tank body 28, the angle between the second liquid discharge pipe 34 and the second liquid inlet pipe 35 is 45 degrees, and a second liquid inlet pipe 35 is provided at the bottom end of the tank body 28, the second liquid discharge pipe 34 is connected to the outer end of the spiral channel 31, and the second liquid inlet pipe 35 is connected to the bottom side of the inner end of the spiral channel 31.

[0035] Specifically, when the concentration heater 4 is performing a concentration treatment on the dichloromethane solution, the concentration circulation pump 3 is connected to the first liquid inlet pipe 32, the first liquid discharge pipe 33 is connected to the feed concentration tank 2, the dichloromethane solution enters the liquid inlet channel 30 from the first liquid inlet pipe 32, the dichloromethane solution flows along the trajectory of the liquid inlet channel 30, the dichloromethane solution in the liquid inlet channel 30 is discharged from the spiral plate 29 from the first liquid discharge pipe 33, the second liquid inlet pipe 35 is connected to the PC drying system 9, the second liquid discharge pipe 34 is connected to the dewatering recovery treatment device 8, hot water enters the spiral channel 31 from the second liquid inlet pipe 35, the hot water flows along the trajectory of the spiral channel 31, and the spiral channel 3 The hot water in the water heater 1 flows out from the second drain pipe 34 and flows into the water recovery device 8. The hot water in the water recovery device 8 is reused through the PC drying system 9. The spiral channel 31 and the liquid inlet channel 30 in the concentration heater 4 are evenly arranged, and the two heat transfer media, the dichloromethane solution and the hot water, can flow in full countercurrent, greatly enhancing the heat exchange effect. The spiral plate 29 adopts a tangential structure with low local resistance. Since the curvature of the spiral plate is uniform, the dichloromethane solution and the hot water flow in the equipment without large turns, and the total resistance is small, thereby increasing the flow rate of the dichloromethane solution and the hot water, so that the dichloromethane solution and the hot water have a higher heat transfer capacity.

[0036] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A polycarbonate solution heat stabilization and concentration energy-saving system, comprising a feed delivery pump and a feed concentration tank, wherein the output end of the feed delivery pump is connected to the feed concentration tank via a pipeline, and is characterized in that: It also includes a concentration circulation pump and a concentration heater. The bottom end of the feed concentration tank is connected to the concentration circulation pump through a pipeline. The concentration circulation pump is connected to the concentration heater through a pipeline. The concentration heater and the feed concentration tank are connected through a pipeline.

2. The polycarbonate solution heat stabilization and concentration energy-saving system according to claim 1, characterized in that: The output end of the feed delivery pump is connected to a first filter, and the first filter and the feed concentration tank are connected via a pipeline.

3. The polycarbonate solution thermal stabilization and concentration energy-saving system according to claim 1, characterized in that: The end of the feed delivery pump is connected to a feed buffer tank, and the top of the feed buffer tank is provided with a first condenser.

4. The polycarbonate solution heat stabilization and concentration energy-saving system according to claim 3, characterized in that: A second condenser is provided at the top of the feed concentration tank, a recovery tank is connected to the second condenser, and a cooling water supply pipe and a cooling water return pipe are respectively connected to the second condenser.

5. The polycarbonate solution heat stabilization and concentration energy-saving system according to claim 4, characterized in that: The gas phase outlet of the first condenser is connected to the gas phase outlet of the third condenser through a pipeline, the second condenser is connected to the gas phase outlet of the third condenser through a pipeline, the third condenser is connected to the recovery condenser through a pipeline, and the third condenser is also connected to an air inlet channel.

6. The polycarbonate solution heat stabilization and concentration energy-saving system according to claim 5, characterized in that: The third condenser is connected to a chilled water return pipe, and the third condenser is also connected to a chilled water supply pipe.

7. The polycarbonate solution heat stabilization and concentration energy-saving system according to claim 1, characterized in that: The concentration heater is connected to a water recovery device, and the concentration heater is also connected to a PC drying system.

8. The polycarbonate solution heat stabilization and concentration energy-saving system according to claim 7, characterized in that: The feed concentration tank is also connected in sequence with a double-blade feed pump, a second filter and a double-blade liquid removal evaporator.

9. The polycarbonate solution heat stabilization and concentration energy-saving system according to claim 5, characterized in that: The feed buffer tank is connected to a feed mixer for conveying dichloromethane solution.

10. The polycarbonate solution heat stabilization and concentration energy-saving system according to claim 9, characterized in that: The feed mixer is connected to an auxiliary buffer tank, the auxiliary buffer tank is connected to a third filter, the third filter is connected to a pouring pump, the pouring pump is connected to an auxiliary mixing tank, the auxiliary mixing tank is connected to the third condenser, the top of the auxiliary mixing tank is connected to a lower hopper, and a stirrer is provided in the auxiliary buffer tank and the auxiliary mixing tank.

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