Chlorinated ether resin monomer recovery and separation apparatus

Abstract

The utility model relates to chloric ether resin monomer recovery technical field, is a kind of chloric ether resin monomer recovery separation device, it includes polymerizer, demister, filter, gas-liquid separation tank, waste water tank, and the first monomer recovery pipeline is fixedly connected between the top outlet of polymerizer and the bottom inlet of demister, and the second monomer recovery pipeline is fixedly connected between the top outlet of demister and the left side inlet of filter, and the third monomer recovery pipeline is fixedly connected between the right side outlet of filter and the left side inlet of gas-liquid separation tank, and the waste water pipeline is fixedly connected between the bottom outlet of gas-liquid separation tank and the inlet of waste water tank, and the fourth monomer recovery pipeline is fixedly connected in the top outlet of gas-liquid separation tank.The utility model is reasonable and compact in structure, convenient to use, and it is recycled to unreacted chloroethylene and vinyl isobutyl ether monomer by demister, filter, gas-liquid separation tank, with safe, labor-saving, simple, efficient characteristics.

Description

Technical Field

[0001] This utility model relates to the field of chloroether resin monomer recovery technology, and is a chloroether resin monomer recovery and separation device. Background Technology

[0002] In the production of vinyl chloride ether resin using emulsion polymerization, vinyl chloride and vinyl isobutyl ether monomers are mixed in a specific ratio to form an emulsion, which is then added to a polymerization reactor for emulsion polymerization. At the end of the reaction, most of the unreacted vinyl isobutyl ether dissolves in the emulsion, with a small amount accumulating at the top of the polymerization reactor. The vast majority of the unreacted vinyl chloride exists in a gaseous state in the top space of the polymerization reactor. After the reaction is completed, a terminator is added to recover the unreacted vinyl chloride. After recovery, the reaction product is transferred to a deetherification reactor to remove residual vinyl isobutyl ether before further processing and drying.

[0003] The conversion rate of the above polymerization reaction is as high as 85% to 90%. Unreacted vinyl chloride monomer enters the compressor buffer tank and is then pressurized by the compressor for recycling. However, because the emulsion method for vinyl chloride ether resin reaction contains emulsifiers, a large amount of foam is easily generated during the vinyl chloride monomer recovery process, carrying various impurities such as polymerization emulsion, other monomers, residual additives, and water. When this foam enters the subsequent condensation and recovery system, it causes severe blockage of the vinyl chloride recovery condenser, recovery monomer storage tank, and pipelines, increasing the frequency of cleaning the recovery system. Simultaneously, it increases operational safety risks and production costs, seriously threatening the safe and stable operation of the plant. Furthermore, the recovered vinyl chloride is of poor quality; reusing it in the polymerization reaction not only affects the safe and stable operation of the polymerization system but also causes fluctuations in product viscosity and other test indicators, thus affecting product quality.

[0004] Therefore, it is essential to research and invent a device for the recovery and separation of chloroether resin monomers. Summary of the Invention

[0005] This invention provides a chloroethylene resin monomer recovery and separation device that overcomes the shortcomings of the prior art. It can effectively solve the problems of foam entrainment, easy clogging of the recovery system, and poor quality of recovered vinyl chloride monomer in the existing chloroethylene resin production monomer recovery process, which in turn affect product quality.

[0006] The technical solution of this utility model is achieved through the following measures: a chloroether resin monomer recovery and separation device, including a polymerization kettle, a demister, a filter, a gas-liquid separation tank, and a wastewater tank. A first monomer recovery pipeline is fixedly connected between the top outlet of the polymerization kettle and the bottom inlet of the demister. A second monomer recovery pipeline is fixedly connected between the top outlet of the demister and the left inlet of the filter. A third monomer recovery pipeline is fixedly connected between the right outlet of the filter and the left inlet of the gas-liquid separation tank. A wastewater pipeline is fixedly connected between the bottom outlet of the gas-liquid separation tank and the inlet of the wastewater tank. A fourth monomer recovery pipeline is fixedly connected to the top outlet of the gas-liquid separation tank.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] The aforementioned demister is equipped with a demister mesh.

[0009] The filter described above contains a filter element with a filtration accuracy of 10 microns.

[0010] A first pressure gauge is fixedly installed on the aforementioned demister.

[0011] The gas-liquid separator is equipped with a second pressure gauge, a thermometer, and a level gauge.

[0012] The first unit recovery pipeline is fixedly equipped with a first recovery shut-off valve and a recovery regulating valve in sequence according to the medium flow direction. The fourth unit recovery pipeline is fixedly equipped with a second recovery shut-off valve, and the wastewater pipeline is fixedly equipped with a liquid level regulating valve.

[0013] The above also includes a PLC controller, which is equipped with a DCS control system. The first pressure gauge, the second pressure gauge, the thermometer, the level gauge, the first recovery shut-off valve, the recovery regulating valve, the level regulating valve, and the second recovery shut-off valve are all connected to the DCS control system. An interlock is provided between the level gauge and the level regulating valve.

[0014] This invention features a reasonable and compact structure, making it easy to use. Through a demister, filter, and gas-liquid separator, it recovers unreacted vinyl chloride monomer from the emulsion polymerization process used to produce vinyl chloride resin. The purity of the recovered vinyl chloride monomer is increased to over 95%, effectively alleviating the problem of vinyl chloride self-polymerization blockage in the recovery system equipment and pipelines, and significantly extending the cleaning cycle of the recovery system. This invention not only significantly improves the utilization rate of recovered monomers but also significantly enhances the stability of product quality. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.

[0016] Appendix Figure 1The codes in the diagram are as follows: 1 for polymerization reactor, 2 for demister, 3 for filter, 4 for gas-liquid separator, 5 for wastewater tank, 6 for first monomer recovery pipeline, 7 for second monomer recovery pipeline, 8 for third monomer recovery pipeline, 9 for fourth monomer recovery pipeline, 10 for wastewater pipeline, 11 for first pressure gauge, 12 for second pressure gauge, 13 for thermometer, 14 for level gauge, 15 for first recovery shut-off valve, 16 for recovery regulating valve, 17 for second recovery shut-off valve, 18 for level regulating valve, and 19 for PLC controller. Detailed Implementation

[0017] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0018] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.

[0019] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0020] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0021] Example 1: As shown in the attached document Figure 1 As shown, the chloroether resin monomer recovery and separation device includes a polymerization reactor 1, a demister 2, a filter 3, a gas-liquid separator 4, and a wastewater tank 5. A first monomer recovery pipeline 6 is fixedly connected between the top outlet of the polymerization reactor 1 and the bottom inlet of the demister 2. A second monomer recovery pipeline 7 is fixedly connected between the top outlet of the demister 2 and the left inlet of the filter 3. A third monomer recovery pipeline 8 is fixedly connected between the right outlet of the filter 3 and the left inlet of the gas-liquid separator 4. A wastewater pipeline 10 is fixedly connected between the bottom outlet of the gas-liquid separator 4 and the inlet of the wastewater tank 5. A fourth monomer recovery pipeline 9 is fixedly connected to the top outlet of the gas-liquid separator 4.

[0022] In this invention, after the polymerization reaction of the emulsion polymerization process for producing chloroethylene resin is completed, the recovered gas containing vinyl chloride monomer is discharged from the top of the polymerization reactor 1 and passes sequentially through the demister 2, filter 3, and gas-liquid separator 4 to remove entrained foam, powder and other impurity particles, water, and additives dissolved in water droplets, respectively, to obtain recovered vinyl chloride monomer with a purity of 95%. After compression and condensation, it is used for system reuse.

[0023] The above-mentioned chloroether resin monomer recovery and separation device can be further optimized and / or improved according to actual needs:

[0024] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, a demister mesh is installed inside the demister 2.

[0025] As needed, when the recovered gas containing vinyl chloride monomer enters the demister 2, the entrained foam rises at a certain speed, collides and breaks with the fine wire mesh, and the small droplets formed are partially attached to the surface of the fine wire mesh. When the gravity exceeds the upward force of the gas and the surface tension of the liquid, the droplets separate from the fine wire mesh and fall.

[0026] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 As shown, filter 3 contains a filter element with a filtration accuracy of 10 micrometers.

[0027] As needed, water droplets and other impurities entrained in the recovered gas containing vinyl chloride monomer enter filter 3, where a 10-micron precision filter element removes powder and other impurity particles. Subsequently, the recovered gas containing vinyl chloride monomer enters gas-liquid separator 4, where gas-liquid separation further removes entrained water droplets and additives dissolved in the water droplets.

[0028] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, a first pressure gauge 11 is fixedly installed on the demister 2.

[0029] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 1 As shown, a second pressure gauge 12, a thermometer 13, and a level gauge 14 are fixedly installed on the gas-liquid separator 4.

[0030] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, a first recovery shut-off valve 15 and a recovery regulating valve 16 are fixedly installed on the first unit recovery pipeline 6 according to the medium flow direction, a second recovery shut-off valve 17 is fixedly installed on the fourth unit recovery pipeline 9, and a liquid level regulating valve 18 is fixedly installed on the wastewater pipeline 10.

[0031] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, it also includes a PLC controller 19, in which a DCS control system is installed. The first pressure gauge 11, the second pressure gauge 12, the thermometer 13, the level gauge 14, the first recovery shut-off valve 15, the recovery regulating valve 16, the level regulating valve 18, and the second recovery shut-off valve 17 are all connected to the DCS control system. An interlock is provided between the level gauge 14 and the level regulating valve 18.

[0032] As needed, during the recovery of the vinyl chloride monomer recovery gas, the recovery gas volume is adjusted by adjusting the opening of the recovery regulating valve 16 according to the pressure change inside the polymerization reactor 1; the wastewater obtained by the gas-liquid separator 4 is collected in the wastewater tank 5.

[0033] Depending on the needs, the pipelines and equipment of this chloroether resin monomer recovery and separation device may also be equipped with conventional valves, thermometers, and pressure gauges known in the art, according to production requirements. The PLC controller can be a Siemens S7-1500, which is equipped with a Yokogawa CS3000 DCS control system.

[0034] Before and after use: Before use, the purity of recovered vinyl chloride monomer was about 90%, and the cleaning cycle of the recovery system was 15 days; after use, the purity of recovered vinyl chloride can reach more than 95%, and the cleaning cycle of the recovery system is extended to more than 60 days.

[0035] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0036] The usage process of this utility model embodiment is as follows: First, the recovered gas containing vinyl chloride monomer enters the demister 2 through the first monomer recovery pipeline 6 for preliminary recovery and separation to obtain the first recovered gas; then, the first recovered gas enters the filter 3 through the second monomer recovery pipeline 7 for further recovery and separation to obtain the second recovered gas; finally, the second recovered gas is further recovered and separated in the gas-liquid separator 4 to obtain recovered vinyl chloride monomer and wastewater. The recovered vinyl chloride monomer enters the subsequent compression and condensation unit, and the wastewater enters the wastewater tank 5 for centralized treatment.

Claims

1. A device for recovering and separating chloroethyl ether resin monomers, characterized in that... The system includes a polymerization reactor, a demister, a filter, a gas-liquid separator, and a wastewater tank. A first monomer recovery pipeline is fixedly connected between the top outlet of the polymerization reactor and the bottom inlet of the demister. A second monomer recovery pipeline is fixedly connected between the top outlet of the demister and the left inlet of the filter. A third monomer recovery pipeline is fixedly connected between the right outlet of the filter and the left inlet of the gas-liquid separator. A wastewater pipeline is fixedly connected between the bottom outlet of the gas-liquid separator and the inlet of the wastewater tank. A fourth monomer recovery pipeline is fixedly connected to the top outlet of the gas-liquid separator.

2. The chloroether resin monomer recovery and separation device according to claim 1, characterized in that... The demister is equipped with a demister mesh.

3. The chloroether resin monomer recovery and separation device according to claim 1 or 2, characterized in that... The filter contains a filter element with a filtration accuracy of 10 microns.

4. The chloroether resin monomer recovery and separation device according to claim 1 or 2, characterized in that... A first pressure gauge is fixedly installed on the demister.

5. The chloroether resin monomer recovery and separation device according to claim 4, characterized in that... A second pressure gauge, thermometer, and level gauge are fixedly installed on the gas-liquid separator.

6. The chloroether resin monomer recovery and separation device according to claim 1, 2, or 5, characterized in that... The first unit recovery pipeline is fixedly equipped with a first recovery shut-off valve and a recovery regulating valve in sequence according to the medium flow direction. The fourth unit recovery pipeline is fixedly equipped with a second recovery shut-off valve, and the wastewater pipeline is fixedly equipped with a liquid level regulating valve.

7. The chloroether resin monomer recovery and separation device according to claim 4, characterized in that... The first unit recovery pipeline is fixedly equipped with a first recovery shut-off valve and a recovery regulating valve in sequence according to the medium flow direction. The fourth unit recovery pipeline is fixedly equipped with a second recovery shut-off valve, and the wastewater pipeline is fixedly equipped with a liquid level regulating valve.

8. The chloroether resin monomer recovery and separation device according to claim 6, characterized in that... It also includes a PLC controller, which is equipped with a DCS control system. The first pressure gauge, the second pressure gauge, the thermometer, the level gauge, the first recovery shut-off valve, the recovery regulating valve, the level regulating valve, and the second recovery shut-off valve are all connected to the DCS control system. An interlock is set between the level gauge and the level regulating valve.

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