CN216223018U - Self-condensing system for recycling vinyl chloride monomer in polymerization kettle - Google Patents
Self-condensing system for recycling vinyl chloride monomer in polymerization kettle Download PDFInfo
- Publication number
- CN216223018U CN216223018U CN202122249034.2U CN202122249034U CN216223018U CN 216223018 U CN216223018 U CN 216223018U CN 202122249034 U CN202122249034 U CN 202122249034U CN 216223018 U CN216223018 U CN 216223018U
- Authority
- CN
- China
- Prior art keywords
- vinyl chloride
- condenser
- pipe
- chloroethylene
- monomer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polymerisation Methods In General (AREA)
Abstract
The utility model provides a self-condensing system for recycling vinyl chloride monomers from a polymerization kettle, which comprises a polymerization kettle, a vinyl chloride gas cabinet, a vinyl chloride compressor, a condenser and a monomer recycling storage tank, wherein the polymerization kettle is connected with an inlet of the vinyl chloride gas cabinet through a vinyl chloride recycling pipe, an outlet of the vinyl chloride gas cabinet is connected with an inlet of the vinyl chloride compressor through a vinyl chloride compression pipe, an outlet of the vinyl chloride compressor is connected with an air inlet on the right side of the condenser through a vinyl chloride condensation pipe, a liquid outlet at the bottom end of the condenser is connected with an inlet of the monomer recycling storage tank through a condenser liquid outlet pipe, and an outlet of the monomer recycling storage tank is connected with a cooling liquid inlet at the bottom end of the condenser through a cooling liquid inlet pipe. The utility model utilizes the physical and chemical properties of the vinyl chloride, realizes the self condensation of the monomers in the discharging process of the polymerization kettle, saves the power consumption and the cold quantity, and ensures the effective, safe and long-period operation of the system.
Description
Technical Field
The utility model relates to a self-condensing system for recycling vinyl chloride monomer in a polymerization kettle, belonging to the field of chemical processes.
Background
In the current PVC suspension polymerization production process, the controllable level of the reaction conversion rate industry of a polymerization kettle is 80 percent, namely, vinyl chloride monomer added into the polymerization kettle is not completely reacted and is polymerized into polyvinyl chloride resin. In the reaction finished material process of a polymerization kettle, vinyl chloride monomer which is not converted is carried in polyvinyl chloride slurry, under the condition of pressure reduction, liquid phase is converted into gas phase, the recovered vinyl chloride gas tank is collected for storage, the vinyl chloride stored in the recovered vinyl chloride gas tank is pressurized by a compressor, the heat exchanger is condensed, a monomer storage tank arranged in a self-flowing inlet device according to high potential difference, the polymerization kettle is repeatedly added for reaction, in the pressurizing and condensing process, a used condenser is a tube type heat exchanger, cooling media used by the shell pass of the current heat exchanger are mostly circulating water, 5 ℃ chilled water, the used cooling media have the following influence on the heat exchanger, on one hand, the circulating water, the quality of the 5 ℃ chilled water has great influence on the heat exchanger, tube scaling often occurs, the heat exchange effect is influenced, the tube of the heat exchanger is corroded when the condition is serious, and the quality of the recovered monomer is influenced by internal leakage. On the other hand, in the aspect of energy efficiency consumption, the energy consumption for using circulating water and 5 ℃ chilled water is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a polymerization kettle vinyl chloride monomer recovery self-condensation system which is simple and easy to implement, convenient to operate, labor-saving and energy-saving and good in recovery and condensation effects.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a self-condensing system for recycling vinyl chloride monomer from a polymerization kettle comprises the polymerization kettle, a vinyl chloride gas cabinet, a vinyl chloride compressor, a condenser and a monomer recycling storage tank, the polymerization kettle is connected with the inlet of a vinyl chloride gas holder through a vinyl chloride recovery pipe, the outlet of the vinyl chloride gas holder is connected with the inlet of a vinyl chloride compressor through a vinyl chloride compression pipe, the outlet of the chloroethylene compressor is connected with the air inlet on the right side of the condenser through a chloroethylene condensing pipe, a liquid outlet at the bottom end of the condenser is connected with an inlet of the monomer recovery storage tank through a condenser liquid outlet pipe, the outlet of the monomer recovery storage tank is connected with the cooling liquid inlet at the bottom end of the condenser through a cooling liquid inlet pipe, the cooling liquid inlet pipe is further connected with a chilled water inlet pipe, a chilled water inlet valve is arranged on the chilled water inlet pipe, and a cooling liquid outlet of the condenser is connected with a chloroethylene recovery pipe through a cooling liquid outlet pipe.
The gas outlet on the top end of the condenser is connected with a pressure swing adsorption device through a gas outlet pipeline, the pressure swing adsorption device is connected with a vinyl chloride gas cabinet, a gas outlet valve and a second pressure meter are arranged on the gas outlet pipeline, and the gas outlet valve is interlocked with the second pressure meter.
And a vinyl chloride circulating valve and a first pressure gauge are arranged on the cooling liquid outlet pipe, and the vinyl chloride circulating valve is interlocked with the first pressure gauge.
And a vinyl chloride regulating valve is arranged on the vinyl chloride recovery pipe.
The cooling liquid outlet pipe is also connected with a chilled water outlet pipe, and a chilled water outlet valve is arranged on the chilled water outlet pipe.
A liquid outlet valve is arranged on the liquid outlet pipe of the condenser, and a thermometer is arranged at a liquid outlet at the bottom end of the condenser.
A cooling liquid inlet valve is arranged on the cooling liquid inlet pipe; the chloroethylene compression pipe is provided with a chloroethylene compression valve.
The utility model has the beneficial effects that: aiming at the problems of high energy consumption and poor effect of vinyl chloride monomer recovery in the production process of the conventional polymerization kettle, the utility model designs a self-condensation system for the vinyl chloride monomer recovery by utilizing the physical and chemical properties of vinyl chloride, realizes the self condensation of the monomer in the discharging process of the polymerization kettle, saves the power consumption and the cold quantity, and ensures the effective, safe and long-period operation of the system.
Drawings
FIG. 1 is a schematic flow diagram of a self-condensing system for recovering vinyl chloride monomer from a polymerizer according to the present invention;
in the figure: 1-a polymerization kettle; 2-chloroethylene gas holder; a 3-vinyl chloride compressor; 4-a condenser; 401-air inlet; 402-a liquid outlet; 403-a coolant inlet; 404-coolant outlet; 405-an air outlet; 5-monomer recovery storage tank; a 6-chloroethylene recovery pipe; a 7-chloroethylene compression tube; 8-vinyl chloride condenser pipe; 9-a condenser liquid outlet pipe; 10-a cooling liquid inlet pipe; 11-a chilled water inlet pipe; 12-coolant outlet pipe; 13-a chilled water outlet pipe; 14-gas outlet pipeline; 15-a pressure swing adsorption unit; 16-vinyl chloride regulating valve; 17-a cooling liquid inlet valve and 18-a chilled water inlet valve; a 19-vinyl chloride circulation valve; 20-a first pressure gauge; 21-chilled water outlet valve; 22-an air outlet valve; 23-a second pressure gauge; 24-a liquid outlet valve; 25-a thermometer; 26-vinyl chloride compression valve.
Detailed Description
As shown in figure 1, a polymerizer recycled vinyl chloride monomer self-condensation system comprises a polymerizer 1, a vinyl chloride gas cabinet 2, a vinyl chloride compressor 3, a condenser 4, a monomer recycling storage tank 5, condensation, 4 is a tubular heat exchanger, polymerizer 1 is connected with the inlet of vinyl chloride gas cabinet 2 through a vinyl chloride recycling pipe 6, the outlet of vinyl chloride gas cabinet 2 is connected with the inlet of vinyl chloride compressor 3 through a vinyl chloride compression pipe 7, the vinyl chloride compression pipe is provided with a vinyl chloride compression valve 26, vinyl chloride recycling pipe 6 is provided with a vinyl chloride regulating valve 16, the height of the gas cabinet and the height of the gas cabinet are ensured through a chain vinyl chloride regulating valve and a DCS controller. The outlet of the vinyl chloride compressor 3 is connected to the air inlet 401 on the right side of the condenser 4 through a vinyl chloride condensing pipe 8. In the discharging process of the polymerizer 1, unconverted vinyl chloride monomer in the polymerizer 1 is vaporized and enters a vinyl chloride gas tank 2 through a vinyl chloride recovery pipe 6, the pressure from the polymerizer 1 to the vinyl chloride gas tank 2 comes from the pressure generated by the reaction heat release of the polymerizer 1, the discharging pressure of the polymerizer 1 is usually controlled to be 0.75Mpa, the vinyl chloride monomer entering the vinyl chloride gas tank 2 enters a vinyl chloride compressor 3 through a vinyl chloride compression pipe 7 to be pressurized, the inlet pressure of the vinyl chloride compressor is controlled to be 2Kpa, and the outlet pressure after pressurization is controlled to be 0.5-0.6 Mpa. Enters the condenser 4 through a vinyl chloride condensing pipe 8 from an air inlet 401 of the condenser 4.
The liquid outlet 402 of 4 bottoms ends of condenser passes through the inlet connection of condenser drain pipe 9 with monomer recovery storage tank 5, and the chloroethylene liquid after the liquefaction gets into monomer recovery storage tank 5 through condenser drain pipe 9, is equipped with drain valve 24 on the condenser drain pipe 9, and the liquid outlet 402 department of condenser bottom is equipped with thermometer 25, monitors the temperature through the thermometer, guarantees the condensation effect, and 5 temperature control of monomer recovery storage tank are at 10-25 ℃. The outlet of the monomer recovery storage tank 5 is connected with a cooling liquid inlet 403 at the bottom end of the condenser 4 through a cooling liquid inlet pipe 10, a cooling liquid inlet valve 17 is arranged on the cooling liquid inlet pipe 10, the cooling liquid inlet pipe 10 is also connected with a chilled water inlet pipe 11, and a chilled water inlet valve 18 is arranged on the chilled water inlet pipe 11. Under the original state, because vinyl chloride liquid phase monomers do not exist in the monomer recovery storage tank 5, 5 ℃ chilled water is used as a cooling medium for the condenser 4, 5 ℃ chilled water is introduced from the chilled water inlet pipe 11, enters the cooling liquid inlet pipe 10, and enters the condenser 4 for condensation through the cooling liquid inlet 403. When chloroethylene liquid-phase monomer exists in the monomer recovery storage tank 5 in the operation process of the system, the cooling medium of the condenser 4 is switched to liquid-phase chloroethylene from the monomer recovery storage tank 5, and the gas-phase monomer from the outlet of the chloroethylene compressor 3 on the tube side of the condenser 4 is condensed by applying the pressure drop vaporization and vaporization heat absorption principle of the chloroethylene monomer, so that the liquefaction of the chloroethylene monomer is realized. High-pressure liquid chloroethylene (the pressure of the liquid chloroethylene in the monomer recovery storage tank 5 is 0.5-0.6 Mpa) enters a low-pressure area of a shell pass of the condenser 4 (the pressure of the shell pass of the condenser 4 is 0.05-0.07 Mpa), is instantly vaporized and absorbs a large amount of heat, absorbs the heat in the shell pass of the condenser 4, and the temperature of the chloroethylene gas-phase monomer in the tube pass of the condenser 4 is reduced through mass transfer and heat transfer, so that the self-condensation of the chloroethylene monomer is realized.
A cooling liquid outlet 404 on the condenser 4 is connected with a chloroethylene recovery pipe 6 through a cooling liquid outlet pipe 12, a chloroethylene circulating valve 19 and a first pressure gauge 20 are arranged on the cooling liquid outlet pipe 12, the chloroethylene circulating valve 19 is interlocked with the first pressure gauge 20 through a DCS controller to automatically control the pressure, the pressure is controlled to be 0.05-0.07Mpa, and the stable operation of the chloroethylene gas cabinet 2 is ensured. The cooling liquid outlet pipe 12 is also connected with a chilled water outlet pipe 13, and the chilled water outlet pipe 13 is provided with a chilled water outlet valve 21. The cooling liquid 5 ℃ chilled water condenses the chloroethylene gas, enters the cooling liquid outlet pipe 12 from the cooling liquid outlet 404, and then enters the chilled water outlet pipe 13 to be discharged. Liquid-phase chloroethylene in the monomer recovery storage tank 5 is vaporized in the shell pass of the condenser 4, and is condensed to chloroethylene gas-phase monomer in the tube pass of the condenser 4, and then enters the cooling liquid outlet pipe 12 from the cooling liquid outlet 404, and further enters the chloroethylene recovery pipe 6 to be mixed with chloroethylene therein to enter the chloroethylene gas holder 2.
The using method comprises the following steps:
1. firstly, a chilled water inlet valve 18 on a chilled water inlet pipe 11 is opened, chilled water with the temperature of 5 ℃ enters the condenser 4 from a cooling liquid inlet 403, and the shell pass of the condenser 4 is exhausted, so that smooth circulation is ensured.
2. And starting the vinyl chloride compressor 3 to operate, and pumping the vinyl chloride compressor 3 to perform reflux operation.
3. The polymerization kettle 1 starts to discharge, vinyl chloride monomer which is not converted in the polymerization kettle 1 is vaporized and enters a vinyl chloride gas cabinet 2 through a vinyl chloride recovery pipe 6 under self pressure, a DCS controller is used for controlling the height of a vinyl chloride adjusting valve 16 and the gas cabinet, an air outlet valve 22 and a second pressure gauge 23 are in a chain running state, vinyl chloride gas-phase monomer in the vinyl chloride gas cabinet 2 enters a vinyl chloride compressor 3 and a condenser 4 to start compression and condensation, the vinyl chloride gas-phase monomer is changed into a liquid-phase form after condensation and is stored in a monomer recovery storage tank 5, and in the process, the constant pressure of the monomer recovery storage tank 5 must be ensured.
4. When the liquid level in the monomer recovery storage tank 5 reaches 40% of that in the monomer recovery storage tank 5, the chilled water inlet valve 18 is closed, the cooling liquid inlet valve 17 is opened, the cooling medium of the condenser 4 is switched from chilled water of 5 ℃ to vinyl chloride liquid-phase monomer from the monomer recovery storage tank 5, the DCS controller is used for controlling the vinyl chloride circulating valve 19 and the first pressure gauge 20 to be put into linkage operation, the pressure is controlled, and the temperature is monitored through the thermometer 25, so that the self-condensation of the vinyl chloride monomer is realized. Before 5 ℃ chilled water of a cooling medium on the shell side of the condenser 4 is switched with a vinyl chloride liquid-phase monomer, the shell side of the condenser 4 must be drained, and the phenomenon that the liquid-phase vinyl chloride enters the shell side of the condenser 4 to be vaporized to absorb a large amount of heat so as to freeze residual chilled water, influence the heat exchange effect or damage the condenser 4 is avoided.
Claims (8)
1. The utility model provides a polymerization kettle retrieves vinyl chloride monomer self-condensing system which characterized in that: including polymeric kettle, vinyl chloride gas holder, chloroethylene compressor, condenser, monomer recovery storage tank, polymeric kettle passes through the import of chloroethylene gas holder of chloroethylene recovery union coupling, the exit of chloroethylene gas holder passes through the access connection of chloroethylene compression pipe with the chloroethylene compressor, the export of chloroethylene compressor is passed through the chloroethylene condenser pipe and is connected with the air inlet on condenser right side, the liquid outlet of condenser bottom passes through the access connection of condenser drain pipe and monomer recovery storage tank, the export of monomer recovery storage tank passes through the coolant liquid inlet connection of coolant liquid feed liquor pipe with the condenser bottom, coolant liquid feed liquor pipe still advances water piping connection with the refrigerated water, be equipped with the refrigerated water intaking valve on the refrigerated water inlet pipe, the coolant liquid export of condenser passes through the coolant liquid drain pipe and is connected with the chloroethylene recovery union coupling.
2. The self-condensing system for recycling vinyl chloride monomer of a polymerizer as claimed in claim 1, wherein: the gas outlet on the top end of the condenser is connected with a pressure swing adsorption device through a gas outlet pipeline, the pressure swing adsorption device is connected with a vinyl chloride gas cabinet, a gas outlet valve and a second pressure meter are arranged on the gas outlet pipeline, and the gas outlet valve is interlocked with the second pressure meter.
3. The self-condensing system for recycling vinyl chloride monomer of a polymerizer as claimed in claim 1, wherein: and a vinyl chloride circulating valve and a first pressure gauge are arranged on the cooling liquid outlet pipe, and the vinyl chloride circulating valve is interlocked with the first pressure gauge.
4. The self-condensing system for recycling vinyl chloride monomer of a polymerizer as claimed in claim 1, wherein: and a vinyl chloride regulating valve is arranged on the vinyl chloride recovery pipe.
5. The self-condensing system for recycling vinyl chloride monomer of a polymerizer as claimed in claim 1, wherein: the cooling liquid outlet pipe is also connected with a chilled water outlet pipe, and a chilled water outlet valve is arranged on the chilled water outlet pipe.
6. The self-condensing system for recycling vinyl chloride monomer of a polymerizer as claimed in claim 1, wherein: a liquid outlet valve is arranged on the liquid outlet pipe of the condenser, and a thermometer is arranged at a liquid outlet at the bottom end of the condenser.
7. The self-condensing system for recycling vinyl chloride monomer of a polymerizer as claimed in claim 1, wherein: and a cooling liquid inlet valve is arranged on the cooling liquid inlet pipe.
8. The self-condensing system for recycling vinyl chloride monomer of a polymerizer as claimed in claim 1, wherein: the chloroethylene compression pipe is provided with a chloroethylene compression valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122249034.2U CN216223018U (en) | 2021-09-16 | 2021-09-16 | Self-condensing system for recycling vinyl chloride monomer in polymerization kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122249034.2U CN216223018U (en) | 2021-09-16 | 2021-09-16 | Self-condensing system for recycling vinyl chloride monomer in polymerization kettle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216223018U true CN216223018U (en) | 2022-04-08 |
Family
ID=80985680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122249034.2U Active CN216223018U (en) | 2021-09-16 | 2021-09-16 | Self-condensing system for recycling vinyl chloride monomer in polymerization kettle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216223018U (en) |
-
2021
- 2021-09-16 CN CN202122249034.2U patent/CN216223018U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108558629A (en) | A kind of production system and production method of refined cyclohexanone | |
| CN216223018U (en) | Self-condensing system for recycling vinyl chloride monomer in polymerization kettle | |
| CN102322414B (en) | Air compressor set capable of recovering and storing interstage cold and heat energy in high-quality manner | |
| CN215693001U (en) | Washing device for vinyl chloride polymerization recovered monomer | |
| CN216629702U (en) | Caprolactam distillation evacuating device | |
| CN216557752U (en) | Methanol heat washing regeneration tower energy recovery system | |
| CN105713113B (en) | A kind of method of condensing field gaseous phase materials heat recovery | |
| CN205917031U (en) | Phosphoric acid refrigeration cycle water vacuum device | |
| CN108504561B (en) | Alcohol fermentation cooling system and method | |
| CN2611840Y (en) | Cool storage compressed air freezing dryer | |
| CN206570190U (en) | A kind of equipment for sludge carbonization technique | |
| CN218793937U (en) | Ethylene glycol rectification device using lithium bromide absorption heat pump | |
| CN220002989U (en) | Energy-saving and stably-operated condensation system of carbon five resin first flash tower | |
| CN213396696U (en) | Distillation heat energy utilization device | |
| CN110665245A (en) | Evaporative cooling integrated equipment | |
| CN212662744U (en) | Alcohol recycling system | |
| CN210711338U (en) | Ethylene glycol rectifier unit waste heat recovery system | |
| CN108050718A (en) | A kind of freezing engineering recycling waste heat recovery system and method | |
| CN219730596U (en) | Wastewater zero-emission system based on supercritical CO2 multistage heat recovery coupling low-temperature flash evaporation | |
| CN104629818B (en) | Vacuum carbonate desulphurization rich solution economic benefits and social benefits desorption technique and system | |
| CN210367490U (en) | Gas phase hydrogenation reaction device for octenal | |
| CN215962204U (en) | High boiling point methacrylate class product rectifier unit | |
| CN211486578U (en) | Jet compressor heat supply system for evaporation tower kettle or tower kettle reboiler | |
| CN219531774U (en) | Heat recycling system for high-pressure temperature-regulating water for producing urea | |
| CN211546366U (en) | Methanation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |