Polymer glue solution flash evaporation concentration system
By adding a glue tank and a secondary flash tank in the polymer glue liquid flash evaporation system, and setting a heater and a booster pump on the connecting pipes, the secondary flash evaporation and concentration of the polymer glue liquid is achieved, which solves the problem of The problem of too low polymer glue concentration in the prior art improves the utilization rate of concentration and low-pressure steam, and reduces energy consumption and equipment investment.
Patent Information
- Application Number
- CN202420609579.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-27
AI Technical Summary
The concentration of existing polymer glue liquid is too low after flash evaporation and concentration, resulting in an increase in steam consumption and an increase in equipment investment.
A system including a polymer kettle, a primary flash tank, a glue liquid tank and a secondary flash tank are designed. The temperature and pressure of the polymer glue liquid are increased on the communication pipeline through a heater and a booster pump to perform secondary flashing. Steam and enrich the concentration to increase the polymer gel.
The concentration of polymer glue liquid is increased from 17% to 30%, reducing low-pressure steam consumption, reducing equipment investment, and avoiding pipeline vibration and damage.
Smart Images
Figure CN222131003U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical equipment, in particular to a polymer glue liquid flash distillation concentration system. Background Art
[0002] During the preparation of chloroprene rubber (SBR) and cis-1,4-butadiene rubber (LCBR), the polymer glue solution needs to be purified to remove the solvent from the polymer glue solution. At the same time, unnecessary compounds such as unreacted monomers and polymers can be removed from the solution. In the industrial process of solution polymerization, the most common purification method for homogeneous polymer solutions is to heat and evaporate the solution. The common heating and evaporation method is the flash concentration method, which is to pass steam into the polymer solution for condensation and stripping operations to decompose and remove the catalyst residues, and then separate the polymers. The solvent is collected by a recovery device for recycling.
[0003] For example, the patent application publication number CN112724281A discloses a method and system for removing solvent from a polymer solution, the system includes a coil heater for heating the polymer solution so that the polymer solution is separated into a dilute solution phase and a concentrated solution phase in the coil; a vertical tube including an inlet, a first outlet and a second outlet, wherein the inlet is connected to the coil heater, the first outlet is located at the top of the vertical tube and is used to separate the dilute solution phase, and the second outlet is located at the bottom of the vertical tube and is connected to a flash evaporation device; and the flash evaporation device is used to flash the concentrated solution phase.
[0004] The above-mentioned method of removing solvent utilizes coils to heat the polymer solution, flashes the solution through a flash tank, and increases the concentration of the polymer. However, the above-mentioned polymer supply method is a one-time flash method, that is, the polymer is discharged from the polymerization kettle to the flash tank once, and then the glue liquid enters the coagulation kettle. After the SBR and LCBR polymer glue liquid is concentrated by only one flash distillation, the glue liquid concentration is only increased by 2-4%, and the polymer glue liquid concentration is still too low. The low concentration of the polymer glue liquid fed to the coagulation kettle will not only greatly increase the steam consumption of the coagulation desolvation method, but also increase the investment in the coagulation kettle equipment. Utility Model Content
[0005] The utility model aims to provide a polymer glue liquid flash distillation concentration system to solve the problem in the prior art that the concentration of the polymer glue liquid after flash distillation concentration is too low, resulting in increased steam consumption.
[0006] In order to achieve the above-mentioned purpose, the utility model provides a polymer glue liquid flash concentration system, comprising a polymerization kettle, a primary flash tank, a glue liquid tank and a secondary flash tank, wherein a liquid inlet pipeline is connected between the liquid outlet of the polymerization kettle and the liquid inlet of the primary flash tank, the liquid outlet of the primary flash tank is communicated with the liquid inlet of the glue liquid tank, a connecting pipeline is connected between the liquid outlet of the glue liquid tank and the liquid inlet of the secondary flash tank, the liquid outlet of the secondary flash tank is connected with a drainage pipeline, and the drainage pipeline is used to communicate with the inlet of the condensation kettle;
[0007] A booster pump and a heater are also arranged on the communicating pipeline. The booster pump is used to increase the pressure of the polymer glue solution after the first flash evaporation, and the heater is used to increase the temperature of the polymer glue solution after the first flash evaporation.
[0008] Preferably, the heater is connected to a steam inlet pipe and a condensate discharge pipe, a first regulating valve is arranged on the steam inlet pipe, a temperature sensor is also arranged on the connecting pipe, and the temperature sensor is electrically connected to the first regulating valve.
[0009] Preferably, a pressure sensor and a second regulating valve are also arranged on the communicating pipe, the pressure sensor is used to detect the pressure in the communicating pipe, and the pressure sensor is electrically connected to the second regulating valve.
[0010] Preferably, the secondary flash tank is also connected to a remote pressure gauge, a nitrogen feed pipe and a vent pipe, the nitrogen feed pipe and the vent pipe are both provided with a third regulating valve, and the remote pressure gauge is electrically connected to the third regulating valve.
[0011] Preferably, both the polymerization kettle and the glue tank are provided with agitators.
[0012] Preferably, a jet pump is connected to the liquid discharge pipe.
[0013] Compared with the prior art, the polymer glue liquid flash distillation and concentration system of the utility model embodiment has the following beneficial effects: a glue liquid tank and a secondary flash distillation tank are added between the primary flash distillation tank and the condensation kettle, a heater and a booster pump are arranged on the connecting pipe between the glue liquid tank and the secondary flash distillation tank, the polymer glue liquid after the primary flash distillation is subjected to secondary flash distillation by the secondary flash distillation tank, and at the same time, before the secondary flash distillation, the temperature and pressure of the polymer glue liquid in the connecting pipe are increased by the heater and the booster pump, so as to increase the amount of solvent removed during the secondary flash distillation; at the same time, after the booster pump pressurizes the polymer glue liquid, it is possible to avoid the polymer glue liquid from generating steam in the connecting pipe due to heating, avoid vibration and damage of the pipe, and ensure the secondary flash distillation operation; the polymer glue liquid is flashed twice by the primary flash distillation tank and the secondary flash distillation tank, so as to improve the polymer concentration, improve the utilization rate of low-pressure steam, reduce energy consumption, and reduce equipment investment. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of a polymer glue liquid flash distillation concentration system of the utility model.
[0015] In the figure, 1, polymerization kettle, 2, primary flash tank, 3, glue liquid tank, 4, secondary flash tank, 5, liquid inlet pipe, 6, connecting pipe, 7, liquid discharge pipe, 8, delivery pump, 9, booster pump, 10, heater, 11, steam inlet pipe, 12, condensate discharge pipe, 13, temperature sensor, 14, first regulating valve, 15, pressure sensor, 16, second regulating valve, 17, remote pressure gauge, 18, nitrogen feed pipe, 19, vent pipe, 20, third regulating valve, 21, agitator, 22, jet pump. DETAILED DESCRIPTION
[0016] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0017] A preferred embodiment of a polymer glue flash distillation concentration system of the utility model is as follows: Figure 1 As shown, the polymer glue liquid flash distillation and concentration system includes a polymerization kettle 1, a primary flash tank 2, a glue liquid tank 3 and a secondary flash tank 4. The polymerization kettle 1 is used to generate the corresponding SBR or LCBR polymer glue liquid. The primary flash tank 2 and the secondary flash tank 4 are used to flash distill and concentrate the polymer glue liquid, remove the solvent in the polymer glue liquid, etc. The glue liquid tank 3 is used to temporarily store the polymer glue liquid after the primary flash distillation. The specific structures of the polymerization kettle 1, the primary flash tank 2, the glue liquid tank 3 and the secondary flash tank 4 are existing technologies and will not be described in detail here.
[0018] The polymerization kettle 1, the primary flash tank 2, the glue tank 3 and the secondary flash tank 4 are connected in sequence, wherein the liquid outlet of the polymerization kettle 1 is connected to the liquid inlet of the primary flash tank 2 via a liquid inlet pipe 5, the liquid outlet of the primary flash tank 2 is connected to the liquid inlet of the glue tank 3, and the liquid outlet of the glue tank 3 is connected to the liquid inlet of the secondary flash tank 4 via a connecting pipe 6. In this embodiment, a delivery pump 8 is connected to the liquid inlet pipe 5, and a delivery pump 8 is also connected to the pipe between the primary flash tank 2 and the glue tank 3 to provide power for the flow of the polymer glue.
[0019] The polymer glue liquid generated by the polymerization kettle 1 enters the primary flash tank 2, glue liquid tank 3 and secondary flash tank 4 in sequence through various pipelines, and performs secondary flash concentration in the primary flash tank 2 and the secondary flash tank 4. The solvent evaporates after reaching the saturation temperature, and the volatilized solvent is recovered and returned to the solvent tank. The polymer stays in the secondary glue liquid flash tank as a liquid phase, thereby achieving the purpose of concentrating the polymer glue liquid. According to the comparison of the results of the field device, after the secondary flash concentration, the concentration of the polymer glue liquid is concentrated from 17% to 30%.
[0020] The liquid outlet of the secondary flash tank 4 is connected to the drain pipe 7, which is used to communicate with the inlet of the coagulation kettle to transport the polymer glue liquid after secondary flash distillation concentration to the coagulation kettle. During on-site operation, after the polymer glue liquid is secondary concentrated, when the solvent is continued to be removed in the coagulation kettle, the low-pressure steam consumption is reduced by about 3000kg / h. The volume of the polymer glue liquid is reduced after concentration, so the volume of the existing coagulation kettle can be reduced, reducing equipment investment. For example, the volume of the existing coagulation kettle is reduced from 103m 3 Reduced to 48.6m 3 .
[0021] A booster pump 9 and a heater 10 are also arranged on the connecting pipe 6 between the glue liquid tank 3 and the secondary flash tank 4. The booster pump 9 is used to pressurize the polymer glue liquid after the primary flash in the connecting pipe 6, and the heater 10 is used to heat the polymer glue liquid after the primary flash in the connecting pipe 6, so as to heat the polymer glue liquid to a certain temperature and pressure. Heating can accelerate volume separation. After the pressurized polymer glue liquid enters the glue liquid tank 3, the pressure drops instantly, and the solvent in the polymer glue liquid can be quickly removed, thereby increasing the amount of solvent removed during the secondary flash. In addition, after the heater 10 heats the polymer glue liquid, the liquid evaporates due to heat and forms part of the gas in the connecting pipe 6. The gas will cause the connecting pipe 6 to vibrate, affecting the stability of the operation. By pressurizing the polymer glue liquid with the booster pump 9, the gas can be dissolved in the polymer glue liquid to avoid damage to the pipeline due to vibration.
[0022] The polymer glue liquid flash distillation and concentration system adds a glue liquid tank 3 and a secondary flash distillation tank 4 between the primary flash distillation tank 2 and the condensation kettle, and arranges a heater 10 and a booster pump 9 on the connecting pipe 6 between the glue liquid tank 3 and the secondary flash distillation tank 4 to perform secondary flash distillation on the polymer glue liquid after the primary flash distillation by using the secondary flash distillation tank 4. At the same time, before the secondary flash distillation, the heater 10 and the booster pump 9 are used to increase the temperature and pressure of the polymer glue liquid in the connecting pipe 6 to increase the amount of solvent removed during the secondary flash distillation; at the same time, after the booster pump 9 pressurizes the polymer glue liquid, it can avoid the polymer glue liquid from generating steam in the connecting pipe 6 due to heating, avoid pipeline vibration and damage, and ensure the secondary flash distillation operation; the polymer glue liquid is flashed twice in total through the primary flash distillation tank 2 and the secondary flash distillation tank 4, thereby improving the polymer concentration, improving the utilization rate of low-pressure steam, reducing energy consumption, and reducing equipment investment.
[0023] Preferably, the heater 10 is connected to a steam inlet pipe 11 and a condensate discharge pipe 12 , a first regulating valve 14 is provided on the steam inlet pipe 11 , a temperature sensor 13 is further provided on the connecting pipe 6 , and the temperature sensor 13 is electrically connected to the first regulating valve 14 .
[0024] The heater 10 is connected to a steam inlet pipe 11 and a condensate discharge pipe 12. The steam inlet pipe 11 can deliver medium-pressure steam to the heater 10. The medium-pressure steam exchanges heat with the polymer glue in the connecting pipe 6 in the heater 10. After the steam is condensed, it is discharged through the condensate discharge pipe 12 to heat the polymer glue. The temperature sensor 13 is arranged at the downstream position of the heater 10, which can detect the temperature of the polymer glue in the connecting pipe 6, and transmit an action signal to the first regulating valve 14 according to the temperature value to control the opening of the first regulating valve 14, thereby controlling the temperature of the polymer glue.
[0025] In this embodiment, the temperature range of the polymer glue in the connecting pipe 6 after being heated by the heater 10 is 150-170°C. If the heating temperature of the polymer glue is not enough (or too high), the amount of flash-evaporated solvent of the glue will be small (or large), which will not meet the glue concentration requirements of the subsequent process.
[0026] Preferably, a pressure sensor 15 and a second regulating valve 16 are further arranged on the communicating pipe 6 . The pressure sensor 15 is used to detect the pressure in the communicating pipe 6 . The pressure sensor 15 is electrically connected to the second regulating valve 16 .
[0027] The pressure sensor 15 is arranged at the downstream position of the temperature sensor 13. The pressure sensor 15 can detect the pressure of the polymer glue after being heated by the heater 10 and pressurized by the booster pump 9, and transmit an action signal to the second regulating valve 16 according to the pressure value, control the opening of the second regulating valve 16, and adjust the pressure of the polymer glue in the connecting pipe 6 before entering the secondary flash tank 4 by the opening of the second regulating valve 16 and the speed of the booster pump 9. In this embodiment, the pressure range of the polymer glue is 10-30kPaG. If the pressure is too high, at the same glue temperature, the amount of glue flash solvent is small, which cannot meet the glue concentration requirements of the later stage. If the pressure is too low, the evaporated gas will exist in the connecting pipe 6, causing pipeline vibration damage.
[0028] Preferably, the secondary flash tank 4 is also connected to a remote pressure gauge 17, a nitrogen feed pipe 18 and a vent pipe 19, and a third regulating valve 20 is provided on both the nitrogen feed pipe 18 and the vent pipe 19, and the remote pressure gauge 17 is electrically connected to the third regulating valve 20.
[0029] The remote pressure gauge 17 is used to detect the pressure value in the secondary flash tank 4, and transmit an action signal to the third regulating valve 20 according to the pressure value, so as to control the opening of the third regulating valve 20, adjust the nitrogen intake rate and the gas discharge rate, so as to adjust the gas amount in the secondary flash tank 4, and then adjust the working pressure in the secondary flash tank 4.
[0030] Preferably, both the polymerization kettle 1 and the glue tank 3 are provided with a stirrer 21 .
[0031] The agitator 21 can stir and mix the polymer glue in the glue tank 3 of the polymerization kettle 1 to prevent the polymer from precipitating and accumulating at the bottom of the polymerization kettle 1 and the glue tank 3, thereby ensuring that the concentration of the polymer glue entering each pipeline is uniform.
[0032] Preferably, a jet pump 22 is connected to the liquid discharge pipe 7 .
[0033] The jet pump 22 provides power for the polymer glue in the discharge pipe, and feeds the polymer glue after the secondary flash evaporation into the coagulation kettle.
[0034] In summary, the embodiment of the utility model provides a flash evaporation and concentration system for polymer glue liquid, which adds a glue liquid tank and a secondary flash evaporation tank between the primary flash evaporation tank and the condensation kettle, and arranges a heater and a booster pump on the connecting pipe between the glue liquid tank and the secondary flash evaporation tank, and uses the secondary flash evaporation tank to perform secondary flash evaporation on the polymer glue liquid after the primary flash evaporation, and at the same time, before the secondary flash evaporation, uses the heater and the booster pump to increase the temperature and pressure of the polymer glue liquid in the connecting pipe, thereby increasing the amount of solvent removed during the secondary flash evaporation; at the same time, after the booster pump pressurizes the polymer glue liquid, it can avoid the polymer glue liquid from generating steam in the connecting pipe due to heating, avoids pipeline vibration and damage, and ensures the secondary flash evaporation operation; the polymer glue liquid is flashed twice in the primary flash evaporation tank and the secondary flash evaporation tank, thereby increasing the polymer concentration, increasing the utilization rate of low-pressure steam, reducing energy consumption, and reducing equipment investment.
[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.
Claims
1. A polymer glue flash distillation concentration system, characterized in that: The invention comprises a polymerization kettle (1), a primary flash tank (2), a glue tank (3) and a secondary flash tank (4); a liquid inlet pipe (5) is connected between the liquid outlet of the polymerization kettle (1) and the liquid inlet of the primary flash tank (2); the liquid outlet of the primary flash tank (2) is communicated with the liquid inlet of the glue tank (3); a connecting pipe (6) is connected between the liquid outlet of the glue tank (3) and the liquid inlet of the secondary flash tank (4); the liquid outlet of the secondary flash tank (4) is connected with a drainage pipe (7); and the drainage pipe (7) is used to communicate with the inlet of the condensation kettle; A booster pump (9) and a heater (10) are also arranged on the connecting pipe (6). The booster pump (9) is used to increase the pressure of the polymer glue solution after the first flash evaporation, and the heater (10) is used to increase the temperature of the polymer glue solution after the first flash evaporation.
2. The polymer glue flash distillation concentration system according to claim 1, characterized in that: The heater (10) is connected to a steam inlet pipe (11) and a condensate discharge pipe (12); a first regulating valve (14) is arranged on the steam inlet pipe (11); a temperature sensor (13) is also arranged on the connecting pipe (6); and the temperature sensor (13) is electrically connected to the first regulating valve (14).
3. The polymer glue flash distillation concentration system according to claim 2, characterized in that: A pressure sensor (15) and a second regulating valve (16) are also arranged on the communicating pipe (6); the pressure sensor (15) is used to detect the pressure in the communicating pipe (6); the pressure sensor (15) is electrically connected to the second regulating valve (16).
4. The polymer glue flash distillation concentration system according to any one of claims 1 to 3, characterized in that: The secondary flash tank (4) is also connected to a remote pressure gauge (17), a nitrogen feed pipe (18) and a vent pipe (19); the nitrogen feed pipe (18) and the vent pipe (19) are both provided with a third regulating valve (20); the remote pressure gauge (17) is electrically connected to the third regulating valve (20).
5. The polymer glue flash distillation concentration system according to any one of claims 1 to 3, characterized in that: The polymerization kettle (1) and the glue liquid tank (3) are both provided with a stirrer (21).
6. The polymer glue flash distillation concentration system according to claim 1, characterized in that: The liquid discharge pipe (7) is connected to a jet pump (22).