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Method for treating sulfolane wastewater

A technology for wastewater treatment and sulfolane, which is applied in extraction water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of simple process flow, low equipment investment and high recovery rate

Active Publication Date: 2018-12-18
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For sulfolane wastewater with a sulfolane content of about 10%, the distillation method needs to remove about 90% of the water, and a large amount of water needs to be vaporized, and the latent heat of vaporization of water is extremely high, and the energy consumption of the distillation method is very large
Moreover, high temperature can easily cause side reactions such as ring opening of sulfolane
Biochemical treatment of sulfolane wastewater, sulfolane is biodegraded and cannot be recycled, resulting in waste of resources

Method used

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  • Method for treating sulfolane wastewater

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Effect test

Embodiment 1

[0022] A set of treatment equipment with a treatment capacity of 100t / h waste water, the content of sulfolane is 100g / L, the method of the present invention is adopted, the extraction agent is dichloromethane, and the extraction equipment is an extraction tower. The waste water and the extractant are pumped into the extraction tower from the bottom and the top of the extraction tower respectively for countercurrent extraction to obtain the extract phase and the raffinate phase, and then the extractant and sulfolane in the extract phase are recovered through the rectification process. The recovered extractant is recycled after cooling. The extraction temperature is 15°C, the volume ratio of extractant to waste water is 1:2, and the theoretical extraction stages are 15. The theoretical stages of the rectification column are 3, the reflux ratio is 0.10, the operating temperature at the top of the tower is 32°C, and the operating temperature at the bottom of the tower is 167°C.

...

Embodiment 2

[0025] A set of treatment equipment with a treatment capacity of 100t / h waste water, the content of sulfolane is 100g / L, the method of the present invention is adopted, and the extractant is a mixture of dichloromethane and chloroform. The mixing ratio is dichloromethane:chloroform=1:4, and the extraction equipment is an extraction tower. The waste water and the extractant are pumped into the extraction tower from the bottom and the top of the extraction tower respectively for countercurrent extraction to obtain the extract phase and the raffinate phase, and then the extractant and sulfolane in the extract phase are recovered through the rectification process. The recovered extractant is recycled after cooling. The extraction temperature is 25°C, the volume ratio of extractant to waste water is 1:2, and the theoretical extraction stages are 4. The theoretical stage of the rectification tower is 6, the reflux ratio is 0.49, the operating temperature at the top of the tower is ...

Embodiment 3

[0028] A set of treatment equipment with a treatment capacity of 100t / h waste water, the content of sulfolane is 100g / L, the method of the present invention is adopted, the extraction agent is ethyl acetate, and the extraction equipment is an extraction tower. The waste water and the extractant are pumped into the extraction tower from the bottom and the top of the extraction tower respectively for countercurrent extraction to obtain the extract phase and the raffinate phase, and then the extractant and sulfolane in the extract phase are recovered through the rectification process. The recovered extractant is recycled after cooling. The extraction temperature is 40°C, the volume ratio of extractant to waste water is 1:1, and the theoretical extraction stages are 14. The theoretical stages of the rectification tower are 5, the reflux ratio is 0.15, the operating temperature at the top of the tower is 65°C, and the operating temperature at the bottom of the tower is 255°C.

[0...

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Abstract

The invention belongs to the technical field of wastewater treatment and relates to a method for treating sulfolane wastewater. The method comprises the following steps: treating wastewater and an extraction agent in an extraction tower or a mixer-settler to obtain an extract phase and a raffinate phase; recycling the raffinate phase; rectifying the extract phase, recovering the extraction agent at the top of the tower, cooling and recycling, and recovering at the tower bottom to obtain sulfolane, wherein the extraction agent is one or more ingredients selected from a group consisting of halogenated hydrocarbon, aromatic hydrocarbon and an ester compound, preferably one or more ingredients selected from a group consisting of dichloromethane, trichloromethane, dichloroethane, benzene, chlorobenzene, o-dichlorobenzene and ethyl acetate. The method has advantages of simple process, convenient operation, energy conservation and high efficiency. The extraction agent can be recycled; the extraction rate of sulfolane and the purity of the recovered sulfolane are both greater than 99%; the content of sulfolane in the treated wastewater is less than 50 mg / L, and the sulfolane can be recycled to achieve zero discharge of wastewater.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to a method for treating sulfolane wastewater. Background technique [0002] Sulfolane is a multi-performance solvent with excellent performance. In addition to being used as an aromatic hydrocarbon extraction solvent, it can also be used as a purifying agent for natural gas, synthetic raw gas and gas refining plants, a solvent for polymer spinning and casting, and a variety of organic reactions It is widely used in the reaction process of halogenation, hydrogenation, hydration, hydrolysis, dehydration, sulfonation, diazotization and polymerization, and is an important chemical raw material. In the sulfolane-containing wastewater produced in the chemical process, the content of sulfolane is high, and direct discharge not only pollutes the environment, but also causes a waste of resources. Therefore, efficient and energy-saving recovery of sulfolane in sulfolane wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26C07D333/48C02F101/34
CPCC02F1/26C02F2101/34C02F2101/40C07D333/48
Inventor 蹇锡高丁秋霞李战胜张守海王锦艳刘程
Owner DALIAN UNIV OF TECH
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