A calcium carbide-based vinyl chloride distillation apparatus

Abstract

The application provides a calcium carbide method vinyl chloride rectification device, which comprises a buffer tank, a booster pump, a water collecting tank, a first rectification low-boiling tower, an air condenser, a secondary condenser, a double-effect heat exchanger, a tail gas condenser, a second rectification tower, a monomer air cooler, a monomer condenser, a monomer intermediate tank and a monomer pump. The buffer tank is connected with the booster pump, the water collecting tank, the air condenser, the secondary condenser, the double-effect heat exchanger and the tail gas condenser. The booster pump and the water collecting tank are connected with the first rectification low-boiling tower. The first rectification low-boiling tower is connected with the double-effect heat exchanger and the second rectification tower. The air condenser is connected with the secondary condenser. The secondary condenser and the double-effect heat exchanger are connected with the tail gas condenser. The second rectification tower is connected with the monomer air cooler, the monomer intermediate tank and the monomer pump. The monomer air cooler is connected with the monomer condenser and the monomer intermediate tank. The monomer condenser is connected with the monomer intermediate tank. The monomer intermediate tank is connected with the monomer pump.

Description

Technical Field

[0001] This invention relates to the field of distillation apparatus technology, and more particularly to a distillation apparatus for vinyl chloride produced by the calcium carbide method. Background Technology

[0002] Most existing distillation units using the calcium carbide method for vinyl chloride require cooling water as a cold source. In terms of overall layout, the equipment is relatively tall, resulting in significant power and cooling consumption. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a calcium carbide-based vinyl chloride distillation apparatus to address the shortcomings of the prior art.

[0004] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A distillation apparatus for vinyl chloride via the calcium carbide method, comprising: a buffer tank, a booster pump, a water collection tank, a first distillation low-boiling column, an air condenser, a secondary condenser, a double-effect heat exchanger, a tail gas condenser, a second distillation column, a single-unit air cooler, a single-unit condenser, a single-unit intermediate tank, and a single-unit pump. The buffer tank is connected to the booster pump, the water collection tank, the air condenser, the secondary condenser, the double-effect heat exchanger, and the tail gas condenser respectively via pipelines. The booster pump and the water collection tank are respectively connected to the first distillation low-boiling column via pipelines. The first distillation low-boiling column is connected to the double-effect heat exchanger and the second distillation column via pipelines. The air condenser is connected to the secondary condenser via pipelines. The secondary condenser and the double-effect heat exchanger are respectively connected to the tail gas condenser via pipelines. The second distillation column is connected to the single-unit air cooler, the single-unit intermediate tank, and the single-unit pump via pipelines. The single-unit air cooler is connected to the single-unit condenser and the single-unit intermediate tank via pipelines. The single-unit condenser is connected to the single-unit intermediate tank via pipelines. The single-unit intermediate tank is connected to the single-unit pump via pipelines.

[0005] The beneficial effects of adopting the technical solution of this invention are: It fully utilizes air cooling, optimizes and improves the process route, simplifies the process, allows equipment to be arranged on the same floor, reduces the building height of the device, and improves economic efficiency. It enables the refining and purification of gaseous crude vinyl chloride to obtain polymerization-grade monomers. It reduces the water content in liquid vinyl chloride, improves monomer quality, reduces the frequency of self-polymerization in the distillation column, and automatically collects the separated water, reducing labor intensity. It fully utilizes liquid level and pressure differences as driving forces and makes full use of the cooling capacity of air, reducing cold source consumption and achieving energy savings.

[0006] Furthermore, the top of the buffer tank is connected via pipes to the bottom of the air condenser, the bottom of the secondary condenser, the bottom of the double-effect heat exchanger, and the bottom of the tail gas condenser. The bottom of the buffer tank is connected via pipes to the booster pump and the water collection tank. The top of the first low-boiling-point distillation column is connected via pipes to the top of the double-effect heat exchanger. The bottom of the first low-boiling-point distillation column is connected via pipes to the side of the second distillation column. The top of the air condenser is connected via pipes to the top of the secondary condenser. The bottom of the secondary condenser is connected via pipes to the tail gas condenser. The top of the condenser is connected, and the bottom of the double-effect heat exchanger is connected to the top and bottom of the tail gas condenser via pipelines. The top of the second distillation column is connected to the top of the single-unit air cooler, the side of the single-unit intermediate tank, and the single-unit pump via pipelines. The top of the single-unit air cooler is connected to the top of the single-unit condenser and the top of the single-unit intermediate tank via pipelines. The bottom of the single-unit air cooler is connected to the top of the single-unit intermediate tank via pipelines. The bottom of the single-unit condenser is connected to the single-unit intermediate tank via pipelines. The side of the single-unit intermediate tank is connected to the single-unit pump via pipelines.

[0007] The beneficial effects of adopting the above-mentioned further technical solutions are: full utilization of air cooling optimizes and improves the process route, simplifies the process, allows equipment to be arranged on the same floor, reduces the building height of the unit, and improves economic efficiency. It enables the refining and purification of gaseous crude vinyl chloride to obtain polymerization-grade monomers. It reduces the moisture content in liquid vinyl chloride, improves monomer quality, reduces the frequency of self-polymerization in the distillation column, and automatically collects the separated water, reducing labor intensity. It fully utilizes liquid level and pressure differences as driving forces and makes full use of air cooling capacity, reducing cold source consumption and achieving energy savings.

[0008] Furthermore, a dehydration device is provided between the booster pump and the first distillation low-boiling column. The booster pump is connected to the side of the dehydration device through a pipeline, the top of the dehydration device is connected to the side of the first distillation low-boiling column through a pipeline, and the bottom of the dehydration device is connected to the water collection tank through a pipeline.

[0009] Furthermore, the bottom of the dehydration device is equipped with a first liquid level indicator and control alarm. The bottom of the dehydration device is connected to the water collection tank through a first regulating valve, and the first regulating valve is connected to the first liquid level indicator and control alarm through a pipeline.

[0010] The beneficial effects of adopting the above-mentioned further technical solution are: an interface gauge (Level Indication Control Alarm, abbreviated as LIC) is added to the bottom of the dehydration device, and a first regulating valve is added to the pipeline on the water collection tank; the first regulating valve and the interface gauge are automatically regulated.

[0011] Furthermore, a second liquid level indicator and control alarm is provided at the bottom of the first distillation low-boiling column. The bottom of the first distillation low-boiling column is connected to the second distillation column through a second regulating valve. The second regulating valve is connected to the second liquid level indicator and control alarm through a pipeline.

[0012] The beneficial effects of adopting the above-mentioned further technical solutions are: an interface meter (Level Indication Control Alarm, abbreviated as LIC) is added to the bottom of the first distillation low-boiling column, and a second regulating valve is added to the pipeline on the second distillation column; the second regulating valve and the interface meter are automatically controlled and regulated.

[0013] Furthermore, the second distillation column is connected to the intermediate tank of the single unit and the single unit pump respectively through a flow cascade regulating valve, and the flow cascade regulating valve is connected to a storage device through a pipeline.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that it facilitates the adjustment of flow rate according to actual needs.

[0015] Furthermore, the second distillation column is provided with a first high-boiling column feed inlet and a second high-boiling column feed inlet on its side, and the first low-boiling column is connected to the first high-boiling column feed inlet and the second high-boiling column feed inlet respectively through pipelines.

[0016] Furthermore, the top of the air condenser is connected to a compressor via a pipe, and the top of the double-effect heat exchanger is connected to an exhaust gas treatment device via a pipe.

[0017] Furthermore, both the secondary condenser and the single-unit condenser are connected to 0-degree cold water via pipelines, and the exhaust gas condenser is connected to -26-degree cold water via pipelines.

[0018] The beneficial effects of adopting the above-mentioned further technical solution are: using 0-degree cold water for cooling, and the countercurrent heat exchange between the cooling water and the gas, thereby improving the heat exchange efficiency.

[0019] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the distillation apparatus provided in an embodiment of the present invention.

[0021] Explanation of reference numerals: 1. Buffer tank; 2. Booster pump; 3. Dehydration device; 4. Water collection tank; 5. First distillation low-boiling column; 6. Air condenser; 7. Secondary condenser; 8. Double-effect heat exchanger; 9. Tail gas condenser; 10. Second distillation column; 11. Individual air cooler; 12. Individual condenser; 13. Individual intermediate tank; 14. Individual pump; 15. First regulating valve; 16. Second regulating valve; 17. Flow cascade regulating valve; 18. Feed inlet of the first distillation high-boiling column; 19. Feed inlet of the second distillation high-boiling column; 20. First liquid level indicator and control alarm; 21. Second liquid level indicator and control alarm; 22. Storage device; 23. Compressor; 24. Tail gas treatment device. Detailed Implementation

[0022] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0023] like Figure 1 As shown, this embodiment of the invention provides a distillation apparatus for vinyl chloride produced via the calcium carbide method, comprising: a buffer tank 1, a booster pump 2, a water collection tank 4, a first distillation low-boiling column 5, an air condenser 6, a secondary condenser 7, a double-effect heat exchanger 8, a tail gas condenser 9, a second distillation column 10, a single-unit air cooler 11, a single-unit condenser 12, a single-unit intermediate tank 13, and a single-unit pump 14. The buffer tank 1 is connected to the booster pump 2, the water collection tank 4, the air condenser 6, the secondary condenser 7, the double-effect heat exchanger 8, and the tail gas condenser 9 via pipelines. The booster pump 2 and the water collection tank 4 are connected to the first distillation low-boiling column 5 via pipelines. The low-boiling distillation column 5 is connected to the double-effect heat exchanger 8 and the second distillation column 10 via pipelines. The air condenser 6 is connected to the secondary condenser 7 via pipelines. The secondary condenser 7 and the double-effect heat exchanger 8 are respectively connected to the tail gas condenser 9 via pipelines. The second distillation column 10 is connected to the single-unit air cooler 11, the single-unit intermediate tank 13, and the single-unit pump 14 via pipelines. The single-unit air cooler 11 is connected to the single-unit condenser 12 and the single-unit intermediate tank 13 via pipelines. The single-unit condenser 12 is connected to the single-unit intermediate tank 13 via pipelines. The single-unit intermediate tank 13 is connected to the single-unit pump 14 via pipelines.

[0024] The beneficial effects of adopting the technical solution of this invention are: It fully utilizes air cooling, optimizes and improves the process route, simplifies the process, allows equipment to be arranged on the same floor, reduces the building height of the device, and improves economic efficiency. It enables the refining and purification of gaseous crude vinyl chloride to obtain polymerization-grade monomers. It reduces the water content in liquid vinyl chloride, improves monomer quality, reduces the frequency of self-polymerization in the distillation column, and automatically collects the separated water, reducing labor intensity. It fully utilizes liquid level and pressure differences as driving forces and makes full use of the cooling capacity of air, reducing cold source consumption and achieving energy savings.

[0025] In existing distillation columns, reflux requires a cooler, which raises the condenser so that the reflux liquid can enter from the top of the column. However, the carbide-based vinyl chloride distillation apparatus of this invention introduces a pump to change the flow direction and orientation of the material, increases the pump for conveying, makes the reflux more controllable, and reduces the building height.

[0026] The buffer tank is equipped with two baffles. One baffle, referred to as the upper baffle, is located in the middle and is about 400mm high from the bottom. The other baffle, referred to as the lower baffle, is located on the left side of the buffer tank, near the outlet. It is a bottom-up structure and is 400mm high. The drain outlet is located between the two baffles.

[0027] A supergravity water separator (dehydration device) was added to reduce the water content in liquid vinyl chloride and decrease the frequency of self-polymerization in the distillation column.

[0028] By utilizing the different pressures of different systems, transportation is achieved through pressure differences between systems and through positional differences within the same system. Using air condensers and double-effect condensers (double-effect heat exchangers), this ingenious process leverages both positional and pressure differences to achieve energy savings.

[0029] By fully utilizing air cooling, an air condenser (6 units) is designed within the unit. In this condenser, the material flows inside the finned tubes, while air cools the outside. The process route is optimized and improved by changing the liquid inflow position of the original tail gas condenser, altering the reflux material in the distillation column, and adding pumps to some fluid transport. This stabilizes distillation efficiency while reducing the building height and improving economics. The unit mainly consists of 14 pieces of equipment, 3 regulating valves, and 2 special feed inlets. Gaseous crude vinyl chloride is refined and purified to obtain polymerization-grade monomers. The process is simple, and equipment can be arranged on the same floor, reducing the building height of the distillation unit. This reduces the moisture content in liquid vinyl chloride, lowering the frequency of self-polymerization in the distillation column; it fully utilizes liquid level and pressure differences as driving forces, resulting in energy savings. It also fully utilizes the cooling capacity of air, contributing to energy efficiency.

[0030] like Figure 1As shown, furthermore, the top of the buffer tank 1 is connected to the bottom of the air condenser 6, the bottom of the secondary condenser 7, the bottom of the double-effect heat exchanger 8, and the bottom of the tail gas condenser 9 via pipelines. The bottom of the buffer tank 1 is connected to the booster pump 2 and the water collection tank 4 via pipelines. The top of the first distillation low-boiling column 5 is connected to the top of the double-effect heat exchanger 8 via a pipeline. The bottom of the first distillation low-boiling column 5 is connected to the side of the second distillation column 10 via a pipeline. The top of the air condenser 6 is connected to the top of the secondary condenser 7 via a pipeline. The bottom of the secondary condenser 7 is connected to the top of the tail gas condenser 9 via a pipeline. The bottom of the double-effect heat exchanger 8 is connected to the top and bottom of the tail gas condenser 9 via pipelines. The top of the second distillation column 10 is connected to the top of the single air cooler 11, the side of the single intermediate tank 13, and the single pump 14 via pipelines. The top of the single air cooler 11 is connected to the top of the single condenser 12 and the top of the single intermediate tank 13 via pipelines. The bottom of the single air cooler 11 is connected to the top of the single intermediate tank 13 via pipelines. The bottom of the single condenser 12 is connected to the single intermediate tank 13 via pipelines. The side of the single intermediate tank 13 is connected to the single pump 14 via pipelines.

[0031] The beneficial effects of adopting the above-mentioned further technical solutions are: full utilization of air cooling optimizes and improves the process route, simplifies the process, allows equipment to be arranged on the same floor, reduces the building height of the unit, and improves economic efficiency. It enables the refining and purification of gaseous crude vinyl chloride to obtain polymerization-grade monomers. It reduces the moisture content in liquid vinyl chloride, improves monomer quality, reduces the frequency of self-polymerization in the distillation column, and automatically collects the separated water, reducing labor intensity. It fully utilizes liquid level and pressure differences as driving forces and makes full use of air cooling capacity, reducing cold source consumption and achieving energy savings.

[0032] like Figure 1 As shown, a dehydration device 3 is further provided between the booster pump 2 and the first distillation low-boiling column 5. The booster pump 2 is connected to the side of the dehydration device 3 through a pipeline, the top of the dehydration device 3 is connected to the side of the first distillation low-boiling column 5 through a pipeline, and the bottom of the dehydration device 3 is connected to the water collection tank 4 through a pipeline.

[0033] like Figure 1 As shown, the bottom of the dehydration device 3 is further provided with a first liquid level indicator and control alarm 20. The bottom of the dehydration device 3 is connected to the water collection tank 4 through a first regulating valve 15. The first regulating valve 15 is connected to the first liquid level indicator and control alarm 20 through a pipeline.

[0034] The beneficial effects of adopting the above-mentioned further technical solution are: an interface gauge (Level Indication Control Alarm, abbreviated as LIC) is added to the bottom of the dehydration device, and a first regulating valve is added to the pipeline on the water collection tank; the first regulating valve and the interface gauge are automatically regulated.

[0035] like Figure 1 As shown, the bottom of the first distillation low-boiling column 5 is provided with a second liquid level indicator and control alarm 21. The bottom of the first distillation low-boiling column 5 is connected to the second distillation column 10 through a second regulating valve 16. The second regulating valve 16 is connected to the second liquid level indicator and control alarm 21 through a pipeline.

[0036] The beneficial effects of adopting the above-mentioned further technical solutions are: an interface meter (Level Indication Control Alarm, abbreviated as LIC) is added to the bottom of the first distillation low-boiling column, and a second regulating valve is added to the pipeline on the second distillation column; the second regulating valve and the interface meter are automatically controlled and regulated.

[0037] like Figure 1 As shown, the second distillation column 10 is further connected to the intermediate tank 13 and the pump 14 via a flow cascade regulating valve 17, and the flow cascade regulating valve 17 is connected to a storage device 22 via a pipeline.

[0038] The beneficial effect of adopting the above-mentioned further technical solution is that it facilitates the adjustment of flow rate according to actual needs.

[0039] like Figure 1 As shown, the second distillation column 10 is further provided with a first high-boiling column feed inlet 18 and a second high-boiling column feed inlet 19 on its side. The first low-boiling column 5 is connected to the first high-boiling column feed inlet 18 and the second high-boiling column feed inlet 19 respectively through pipelines.

[0040] like Figure 1 As shown, the top of the air condenser 6 is further connected to a compressor 23 via a pipe, and the top of the double-effect heat exchanger 8 is connected to an exhaust gas treatment device 24 via a pipe.

[0041] like Figure 1 As shown, the secondary condenser 7 and the single condenser 12 are both connected to 0-degree cold water via pipelines, and the exhaust gas condenser 9 is connected to -26-degree cold water via pipelines.

[0042] The beneficial effects of adopting the above-mentioned further technical solution are: using 0-degree cold water for cooling, and the countercurrent heat exchange between the cooling water and the gas, thereby improving the heat exchange efficiency.

[0043] Vinyl chloride gas from compressor 23 outside the boundary area (previous process) enters air condenser 6 from the top. The condensed liquid vinyl chloride enters buffer tank 1. The uncondensed gas enters secondary condenser 7 from the top. Secondary condenser 7 is cooled by 0-degree cold water. The cooling water and gas exchange heat countercurrently. The uncondensed gas exits from the side of secondary condenser 7 and merges with the gas cooled from the top of the distillation low-boiling column (first distillation low-boiling column) and enters the top of tail gas condenser 9. The uncondensed gas exits from the side of tail gas condenser 9 and enters the lower part of the shell of double-effect heat exchanger 8.

[0044] After heat exchange, the gas exits from the upper part of the shell of the double-effect heat exchanger 8 and enters the exhaust gas treatment device 24.

[0045] The liquid produced by the condensation of the air condenser 6, the secondary condenser 7, the double-effect heat exchanger 8, and the exhaust gas condenser 9 enters the buffer tank 1.

[0046] A supergravity dehydration device (dehydration device) is added between the feed pump (booster pump 2) and the distillation column (first distillation low-boiling column).

[0047] The feed pump (booster pump) enters from the side of the dehydration unit 3 and exits from the top, and is then connected to the distillation column (the first distillation low-boiling column).

[0048] The bottom of the supergravity dehydration device (dehydration device) has a pipeline connected to the original water collection tank 4.

[0049] An interface gauge (Level Indication Control Alarm) is added to the bottom of the supergravity dehydration device, and a pneumatic regulating valve (first regulating valve) is added to the pipeline on the water collection tank 4.

[0050] Pneumatic regulating valve (first regulating valve) and interface meter self-control regulation.

[0051] It reduces the water content in monomers, improving monomer quality; the separated water is automatically collected, requiring no additional labor on-site. Investment costs are low, with no increase in power or other material consumption. It fully utilizes cooling capacity, reducing cold source consumption.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A distillation apparatus for chloroethene produced by calcium carbide method, characterized by comprising: It includes: Buffer tank (1), booster pump (2), water collection tank (4), first rectification low boiling tower (5), air condenser (6), secondary condenser (7), double effect heat exchanger (8), tail gas condenser (9), second rectification tower (10), single air cooler (11), single condenser (12), single intermediate tank (13), single pump (14), the buffer tank (1) is connected with the booster pump (2), the water collection tank (4), the air condenser (6), the secondary condenser (7), the double effect heat exchanger (8), the tail gas condenser (9) respectively through pipeline, the booster pump (2) and the water collection tank (4) are connected with the first rectification low boiling tower (5) respectively through pipeline, the first rectification low boiling tower (5) is connected with the double effect heat exchanger (8), the second rectification tower (10) through pipeline, the air condenser (6) is connected with the secondary condenser (7) through pipeline, the secondary condenser (7) and the double effect heat exchanger (8) are connected with the tail gas condenser (9) respectively through pipeline, the second rectification tower (10) is connected with the single air cooler (11), the single intermediate tank (13), the single pump (14) respectively through pipeline, the single air cooler (11) is connected with the single condenser (12) and the single intermediate tank (13) through pipeline, the single condenser (12) is connected with the single intermediate tank (13) through pipeline, the single intermediate tank (13) is connected with the single pump (14) through pipeline; The top of the buffer tank (1) is connected with the bottom of the air condenser (6), the bottom of the secondary condenser (7), the bottom of the double-effect heat exchanger (8), and the bottom of the tail gas condenser (9) through pipelines respectively, the bottom of the buffer tank (1) is connected with the booster pump (2) and the water collecting tank (4) through pipelines respectively, the top of the first rectification low-boiling tower (5) is connected with the top of the double-effect heat exchanger (8) through a pipeline, the bottom of the first rectification low-boiling tower (5) is connected with the side of the second rectification tower (10) through a pipeline, the top of the air condenser (6) is connected with the top of the secondary condenser (7) through a pipeline, the bottom of the secondary condenser (7) is connected with the top of the tail gas condenser (9) through a pipeline, the bottom of the double-effect heat exchanger (8) is connected with the top and the bottom of the tail gas condenser (9) through pipelines respectively, the top of the second rectification tower (10) is connected with the top of the single-body air cooler (11), the side of the single-body intermediate tank (13), and the single-body pump (14) through pipelines respectively, the top of the single-body air cooler (11) is connected with the top of the single-body condenser (12) and the top of the single-body intermediate tank (13) through pipelines, the bottom of the single-body air cooler (11) is connected with the top of the single-body intermediate tank (13) through a pipeline, the bottom of the single-body condenser (12) is connected with the single-body intermediate tank (13) through a pipeline, and the side of the single-body intermediate tank (13) is connected with the single-body pump (14) through a pipeline. A dehydration device (3) is arranged between the booster pump (2) and the first rectification low-boiling tower (5), the booster pump (2) is connected with the side of the dehydration device (3) through a pipeline, the top of the dehydration device (3) is connected with the side of the first rectification low-boiling tower (5) through a pipeline, and the bottom of the dehydration device (3) is connected with the water collecting tank (4) through a pipeline.

2. A calcium carbide method chloroethylene rectification device according to claim 1, characterized by, A first liquid level indication control alarm (20) is arranged at the bottom of the dehydration device (3), the bottom of the dehydration device (3) is connected with the water collecting tank (4) through a first regulating valve (15), and the first regulating valve (15) is connected with the first liquid level indication control alarm (20) through a pipeline.

3. A calcium carbide method vinyl chloride rectification device according to claim 1, characterized in that, A second liquid level indication control alarm (21) is arranged at the bottom of the first rectification low-boiling tower (5), the bottom of the first rectification low-boiling tower (5) is connected with the second rectification tower (10) through a second regulating valve (16), and the second regulating valve (16) is connected with the second liquid level indication control alarm (21) through a pipeline.

4. The calcium carbide method vinyl chloride rectification device according to claim 1, characterized by, The second rectification tower (10) is connected with the single-body intermediate tank (13) and the single-body pump (14) through a flow series regulating valve (17), and the flow series regulating valve (17) is connected with a storage device (22) through a pipeline.

5. The calcium carbide method chloroethylene rectification apparatus according to claim 1, characterized by The side of the second rectification tower (10) is provided with a first rectification high-boiling tower feed port (18) and a second rectification high-boiling tower feed port (19), and the first rectification low-boiling tower (5) is connected with the first rectification high-boiling tower feed port (18) and the second rectification high-boiling tower feed port (19) through pipelines respectively.

6. The calcium carbide method chloroethylene rectification device according to claim 1, characterized by, The top of the air condenser (6) is connected with a compressor through a pipeline, and the top of the double-effect heat exchanger (8) is connected with a tail gas treatment device through a pipeline.

7. The calcium carbide method vinyl chloride rectification device according to claim 1, characterized by, The secondary condenser (7) and the single condenser (12) are both connected with 0-degree cold water through pipelines, and the tail gas condenser (9) is connected with -26-degree cold water through a pipeline.

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