CN215855209U - Waste alkali liquid chloroethylene recovery processing device - Google Patents

Waste alkali liquid chloroethylene recovery processing device Download PDF

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Publication number
CN215855209U
CN215855209U CN202122179625.7U CN202122179625U CN215855209U CN 215855209 U CN215855209 U CN 215855209U CN 202122179625 U CN202122179625 U CN 202122179625U CN 215855209 U CN215855209 U CN 215855209U
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waste alkali
waste
alkali
pipe
vinyl chloride
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CN202122179625.7U
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Chinese (zh)
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李宏魁
李海霞
李学文
肖恭鑫
张飞贤
朱琴
辛丹
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Jinchuan Group Co Ltd
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Jinchuan Group Co Ltd
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Abstract

The utility model discloses a waste alkali liquid chloroethylene recovery processing device, which comprises a waste alkali groove, a waste alkali stripping tower, a waste alkali recovery system and a chloroethylene recovery system; the bottom of the spent caustic soda stripping tower is connected with a steam inlet device, the upper part of the spent caustic soda stripping tower is provided with an alkali liquor inlet pipe, and the top of the spent caustic soda stripping tower is provided with a vinyl chloride condenser; the head end of the alkali liquor feeding pipe is provided with a spray head, the tail end of the alkali liquor feeding pipe is connected with a waste alkali tank, and an alkali liquor lifting pump is also arranged on the alkali liquor feeding pipe; the waste alkali recovery system comprises a waste alkali recovery pump and a waste alkali cooler, a waste alkali outlet is formed in the bottom of the waste alkali stripping tower, the waste alkali outlet is connected with the waste alkali recovery pump and the waste alkali cooler through pipelines, and the outlet of the waste alkali cooler is respectively connected to the neutralization tank and the waste alkali tank through pipelines; the chloroethylene recovery system comprises a gas pipe and a gas cabinet, one end of the gas pipe is connected with the outlet of the chloroethylene condenser, the other end of the gas pipe is connected with the gas cabinet, and the gas pipe is further provided with a control valve.

Description

Waste alkali liquid chloroethylene recovery processing device
Technical Field
The utility model belongs to the technical field of chemical production, and particularly relates to a waste alkali liquid chloroethylene recovery processing device.
Background
In the process of producing chloroethylene, crude chloroethylene is prepared from hydrogen chloride and acetylene, in order to ensure production safety, improve conversion rate and reduce cost consumption, excessive hydrogen chloride gas in the control ratio is required to be absorbed in a water washing tower, but a trace acid mist entrainment phenomenon exists, and the trace acid mist can be brought into a rear system; in addition, in the process of converting hydrogen chloride and acetylene, due to the existence of side reactions, part of acid gases which cannot be absorbed by water, such as carbon monoxide, carbon dioxide and the like, can be generated by the side reactions, and in order to ensure that the acid gases are not brought into a back system to corrode a device pipeline and influence the pH value of a polyvinyl chloride intermediate product, an alkaline tower is required to be used as a device for controlling the pH value of the intermediate product in the vinyl chloride preparation process.
In actual production, the alkali liquor in the alkali washing tower needs to be replaced regularly according to the operation index conditions, the alkali liquor is generally directly discharged to a trench in the industry, by-product waste acid is added into the trench for neutralization and then enters a sewage treatment station or a mercury-containing wastewater treatment device, and the mercury-containing waste alkali is discharged after treatment to reach the standard.
The vinyl chloride-containing waste alkali recovery treatment device is used for thoroughly recovering vinyl chloride contained in waste alkali, is used for device production, solves the potential safety hazard of vinyl chloride enrichment, and can achieve the purposes of saving energy, reducing emission and reducing production cost. The utility model is characterized in that the characteristic that liquid phase chloroethylene is heated and vaporized by reasonably utilizing the different boiling points of the liquid phase chloroethylene and the waste alkali is provided with a waste alkali stripping tower and an auxiliary heat exchange, cooling, conveying and control system, steam is introduced into the waste alkali stripping tower, chloroethylene is heated and vaporized, gas phase chloroethylene is collected in a chloroethylene gas tank after being condensed by a tower top condenser, liquid phase waste alkali liquor is cooled and then conveyed to a wastewater treatment process, and is conveyed to a mercury removal device after being neutralized, when the mercury content in the wastewater reaches a discharge index, the wastewater is conveyed to a sewage treatment station, and when all indexes of the sewage reach the discharge requirement, the wastewater is discharged after reaching the standard.
The device for recycling the waste alkali containing the vinyl chloride is characterized by reasonably utilizing the byproduct low-pressure steam in the boundary area of the device, vaporizing and collecting the vinyl chloride in the waste alkali liquor, reasonably recycling, realizing energy conservation and emission reduction and saving the production cost.
SUMMERY OF THE UTILITY MODEL
The utility model provides a waste alkali liquid chloroethylene recovery processing device, and aims to solve the technical problem.
Therefore, the utility model adopts the following technical scheme:
a vinyl chloride recovery processing device of waste alkali liquor comprises a waste alkali tank, a waste alkali stripping tower, a waste alkali recovery system and a vinyl chloride recovery system;
the bottom of the spent caustic soda stripping tower is connected with a steam inlet device, the upper part of the spent caustic soda stripping tower is provided with an alkali liquor inlet pipe, and the top of the spent caustic soda stripping tower is provided with a vinyl chloride condenser; the head end of the alkali liquor feeding pipe is provided with a spray head, the tail end of the alkali liquor feeding pipe is connected with a waste alkali tank, and an alkali liquor lifting pump is also arranged on the alkali liquor feeding pipe;
the waste alkali recovery system comprises a waste alkali recovery pump and a waste alkali cooler, a waste alkali outlet is formed in the bottom of the waste alkali stripping tower, the waste alkali outlet is connected with the waste alkali recovery pump and the waste alkali cooler through pipelines, and the outlet of the waste alkali cooler is respectively connected to the neutralization tank and the waste alkali tank through pipelines;
the chloroethylene recovery system comprises a gas pipe and a gas cabinet, one end of the gas pipe is connected with the outlet of the chloroethylene condenser, the other end of the gas pipe is connected with the gas cabinet, and the gas pipe is further provided with a control valve.
Furthermore, a waste alkali return pipe is arranged between the alkali liquor lifting pump and the waste alkali tank, and an adjusting valve is arranged on the waste alkali return pipe.
Furthermore, a washing water inlet pipe is connected to the waste alkali tank.
Further, an air pressure balance pipe is connected between the air delivery pipe and the waste alkali tank, and an adjusting valve is arranged on the air pressure balance pipe.
Further, the bottom of the waste alkali groove is also provided with a draining port.
Furthermore, a return pipe is arranged between the waste alkali recovery pump and the waste alkali stripping tower, and a regulating valve is arranged on the return pipe.
Furthermore, a circulating water inlet pipe and a circulating water outlet pipe are arranged on the chloroethylene condenser and the waste alkali cooler.
The utility model has the beneficial effects that: waste alkali liquor from the purification post alkaline tower is hermetically sent into a waste alkali tank through an alkali circulating pump, and vinyl chloride gas phase resolved from the waste alkali enters a vinyl chloride gas cabinet through a balance pipeline; the chloroethylene gas phase desorbed by the waste alkali stripping tower is automatically regulated to enter a chloroethylene gas cabinet by setting the tower top control pressure; the vinyl chloride content in the waste alkali liquor from the tower bottom is less than 5PPm, the use condition of the waste water treatment device is achieved, the hidden danger of vinyl chloride enrichment is eliminated in the waste water treatment process, the operation risk is reduced, the environmental pollution is avoided, and the physical and mental health of staff is protected; is beneficial to saving energy, reducing emission and reducing production cost. By utilizing the operation mode, automatic interlocking control is completely realized, the automation degree is high, and the labor intensity of personnel is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the operation of the system of the present invention;
in the figure: 1-waste alkali tank, 2-alkali liquor lift pump, 3-waste alkali stripping tower, 4-waste alkali recovery pump, 5-waste alkali cooler and 6-vinyl chloride condenser.
Detailed Description
The utility model will be further described with reference to the accompanying drawings in which:
as shown in figure 1, a waste lye chloroethylene recovery processing device comprises a waste lye tank 1, a waste lye stripping tower 3, a waste lye recovery system and a chloroethylene recovery system.
The bottom of the spent caustic soda stripping tower 3 is connected with a steam inlet device, the upper part of the spent caustic soda stripping tower is provided with an alkali liquor inlet pipe, and the top of the spent caustic soda stripping tower is provided with a chloroethylene condenser 6. The head end of the alkali liquor feeding pipe is provided with a spray head, the tail end of the alkali liquor feeding pipe is connected with a waste alkali tank 1, and the alkali liquor feeding pipe is also provided with an alkali liquor lifting pump 2; a waste alkali return pipe is arranged between the alkali liquor lifting pump 2 and the waste alkali tank 1, and an adjusting valve is arranged on the waste alkali return pipe.
The waste alkali recovery system comprises a waste alkali recovery pump 4 and a waste alkali cooler 5, a waste alkali outlet is formed in the bottom of the waste alkali stripping tower 3, the waste alkali outlet is connected with the waste alkali recovery pump 4 and the waste alkali cooler 5 through pipelines, and an outlet of the waste alkali cooler 5 is connected to the neutralization tank and the waste alkali tank 1 through pipelines respectively. A return pipe is arranged between the spent caustic soda recovery pump 4 and the spent caustic soda stripping tower 3, and a regulating valve is arranged on the return pipe.
The chloroethylene recovery system comprises a gas pipe and a gas cabinet, one end of the gas pipe is connected with the outlet of the chloroethylene condenser 6, the other end of the gas pipe is connected with the gas cabinet, and the gas pipe is further provided with a control valve. An air pressure balance pipe is connected between the air delivery pipe and the waste alkali tank 1, and an adjusting valve is arranged on the air pressure balance pipe. And a circulating water inlet pipe and a circulating water outlet pipe are arranged on the chloroethylene condenser 6 and the waste alkali cooler 5.
The body of the waste alkali tank 1 and the inner coil pipe are made of stainless steel, a washing water inlet pipe is connected to the waste alkali tank 1, and a drain port is further formed in the bottom of the waste alkali tank 1.
The working principle of the utility model is as follows:
starting a waste alkali recovery processing device system containing vinyl chloride, opening a gas phase balance valve of a waste alkali tank 1, conveying waste alkali liquor to a waste alkali storage tank by using a purification device alkali circulating pump, opening a cooler circulation regulating valve in each system when the liquid level in the waste alkali tank 1 rises to about 75%, controlling the valve position to about 10%, opening a steam regulating valve in a waste alkali stripping tower 3, slowly introducing steam, opening an outlet valve of the waste alkali tank 1 when the temperature of a tower kettle in the waste alkali stripping tower 3 rises to 115 ℃, starting an alkali liquor tower inlet conveying pump, opening a pump outlet valve, opening a tower inlet regulating valve, conveying the waste alkali liquor to the waste alkali stripping tower 3 through an alkali liquor lifting pump 2, introducing the alkali liquor from the top of the waste alkali stripping tower 3, and uniformly dispersing the waste alkali liquor to a filler section in the tower through a distribution plate in the tower; the method comprises the steps of adjusting the flow of steam entering a tower in time according to the temperature condition of a tower kettle, maintaining the temperature of the tower kettle stable, enabling the steam to enter from the bottom of a stripping tower and to transfer heat with waste alkali liquor, controlling the outlet temperature of a condenser at the top of the tower to be less than 40 ℃, setting the pressure of a gas phase outlet at the top of the tower to be 0.25Mpa, starting a waste alkali recovery pump 4 when the liquid level of the tower kettle of a waste alkali stripping tower 3 rises to 55%, controlling the outlet temperature of a waste alkali liquor cooler at the bottom of the tower to be less than 35 ℃, pumping the cooled waste alkali liquor out of the tower to a waste water neutralization tank for subsequent mercury removal treatment, and normally starting a system.
It should be noted that the above are only some embodiments of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (7)

1. A vinyl chloride recovery processing device of waste alkali liquor is characterized by comprising a waste alkali tank (1), a waste alkali stripping tower (3), a waste alkali recovery system and a vinyl chloride recovery system;
the bottom of the spent caustic soda stripping tower (3) is connected with a steam inlet device, the upper part of the spent caustic soda stripping tower is provided with an alkali liquor inlet pipe, and the top of the spent caustic soda stripping tower is provided with a vinyl chloride condenser (6); the head end of the alkali liquor feeding pipe is provided with a spray head, the tail end of the alkali liquor feeding pipe is connected with a waste alkali tank (1), and the alkali liquor feeding pipe is also provided with an alkali liquor lifting pump (2);
the waste alkali recovery system comprises a waste alkali recovery pump (4) and a waste alkali cooler (5), a waste alkali outlet is formed in the bottom of the waste alkali stripping tower (3), the waste alkali outlet is connected with the waste alkali recovery pump (4) and the waste alkali cooler (5) through pipelines, and the outlet of the waste alkali cooler (5) is respectively connected to the neutralization tank and the waste alkali tank (1) through pipelines;
the chloroethylene recovery system comprises a gas conveying pipe and a gas cabinet, one end of the gas conveying pipe is connected with the outlet of the chloroethylene condenser (6), the other end of the gas conveying pipe is connected with the gas cabinet, and the gas conveying pipe is further provided with a control valve.
2. The vinyl chloride recycling device of waste lye of claim 1 wherein there is a waste lye return pipe between the lye lift pump (2) and the waste lye tank (1), and there is a regulating valve on the waste lye return pipe.
3. The vinyl chloride recycling device of the waste alkali liquor according to claim 1, characterized in that the waste alkali tank (1) is connected with a washing water inlet pipe.
4. The vinyl chloride recycling device of waste alkali liquor according to claim 3, wherein an air pressure balance pipe is connected between the air delivery pipe and the waste alkali tank (1), and an adjusting valve is arranged on the air pressure balance pipe.
5. The vinyl chloride recycling device of the spent caustic solution according to claim 3, wherein the bottom of the spent caustic tank (1) is further provided with a drain outlet.
6. The vinyl chloride recycling device of the spent caustic soda as claimed in claim 2, wherein a return pipe is arranged between the spent caustic soda recycling pump (4) and the spent caustic soda stripping tower (3), and the return pipe is provided with a regulating valve.
7. The vinyl chloride recycling device of waste alkali liquor according to claim 2, wherein the vinyl chloride condenser (6) and the waste alkali cooler (5) are both provided with a circulating water inlet pipe and a circulating water outlet pipe.
CN202122179625.7U 2021-09-09 2021-09-09 Waste alkali liquid chloroethylene recovery processing device Active CN215855209U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122179625.7U CN215855209U (en) 2021-09-09 2021-09-09 Waste alkali liquid chloroethylene recovery processing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122179625.7U CN215855209U (en) 2021-09-09 2021-09-09 Waste alkali liquid chloroethylene recovery processing device

Publications (1)

Publication Number Publication Date
CN215855209U true CN215855209U (en) 2022-02-18

Family

ID=80258420

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202122179625.7U Active CN215855209U (en) 2021-09-09 2021-09-09 Waste alkali liquid chloroethylene recovery processing device

Country Status (1)

Country Link
CN (1) CN215855209U (en)

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