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Treatment technology for tail gas generated from production process of cis-Z-3-(2-chloro-3, 3, 3-triflulo-1-propenyl)-2, 2-dimethyl cyclopropane carbonyl chloride

A production process, the technology of kung fu acid chloride, applied in the direction of dispersion particle separation, chemical instruments and methods, separation methods, etc., can solve the problems of high processing cost and complicated process, and achieve the effect of reducing processing cost, simple process and improving economic benefits

Inactive Publication Date: 2012-12-19
安徽新北卡化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The tail gas produced in the acyl chloride production process is mainly a mixed gas of hydrogen chloride and sulfur dioxide. The traditional process of absorbing the tail gas mostly adopts secondary sodium hydroxide lye to absorb, and the waste water after absorption must undergo three-effect evaporation because it contains sodium chloride and sodium sulfite. After desalination, it can be sent to the comprehensive sewage biochemical treatment system for subsequent treatment, and it will be discharged after reaching the standard. The process is complicated and the treatment cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Firstly, the tail gas is passed into the falling film absorption tower and passes through the first-level falling film absorber. After the hydrogen chloride gas in the tail gas is absorbed by the first-level falling film absorber, most of the hydrogen chloride gas is absorbed to generate hydrochloric acid, which is released from the absorption tower. The gas is sulfur dioxide and part of hydrogen chloride gas, when the concentration of hydrochloric acid reaches more than 20%, start pumping hydrochloric acid into the hydrochloric acid storage tank;

[0027] (2) The released gas enters the secondary falling film absorber for absorption again, the hydrogen chloride gas is completely absorbed, and the gas released from the absorption tower is sulfur dioxide;

[0028] (3) The released sulfur dioxide gas is passed into 18% soda ash aqueous solution for tertiary absorption, and most of the sulfur dioxide reacts with soda ash to form sodium bisulfite;

[0029] (4) After the th...

Embodiment 2

[0031] Test Data

[0032] According to the production capacity of the company's kung fu acid chloride production device, the use of the present invention can produce about 274.5 tons of hydrochloric acid (30%) by-product a year, which can be used for pH adjustment in the company's acetamiprid production process, which is conducive to reducing production costs . The by-product of 30% sodium bisulfite is about 780 tons a year, worth more than 1.56 million yuan. In terms of cost, only 120 tons of soda ash is needed, about 300,000 yuan. In contrast, the original process used about 190 tons of caustic soda to absorb hydrogen chloride and sulfur dioxide, and about 1,900 tons of sodium chloride and sodium sulfite wastewater were produced (the absorption solution was prepared at 10%). This part of high-salt wastewater needs to be desalinated by a three-effect evaporator before entering the sewage biochemical treatment system, which consumes 1,140 tons of steam and is worth 279,300 y...

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PUM

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Abstract

The invention discloses an improved treatment technology for tail gas from production of cis-Z-3-(2-chloro-3, 3, 3-triflulo-1-propenyl)-2, 2-dimethyl cyclopropane carbonyl chloride. The improved treatment technology is performed by adopting a four-stage tail gas absorption system to respectively absorb chlorine hydride and sulfur dioxide by utilizing the different solubilities of chlorine hydride gas and sulfur dioxide gas in water. The improved treatment technology disclosed by the invention has the advantages of low investment, fast onset of action and effect of changing waste into valuable things, and can enable products generated by absorption to re-enter into a production link or a selling link, not only reduce environmental pollution, but also save production cost and increase economic benefits.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a tail gas treatment process produced in the production process of kung fu acid chloride. Background technique [0002] Kungfu acid chloride, chemical name: 2,2-dimethyl-3-(2-chloro-3,3,3-trifluoro-1-propenyl) cyclopropane acid chloride, also known as trifluorochlorochrysanthemum acid chloride, chemical structure formula is : [0003] , [0004] The tail gas produced in the production process of acyl chloride is mainly a mixed gas of hydrogen chloride and sulfur dioxide. The traditional process of absorbing the tail gas mostly adopts secondary sodium hydroxide lye to absorb, and the waste water after absorption must undergo three-effect evaporation because it contains sodium chloride and sodium sulfite. After desalination, it can be sent to the comprehensive sewage biochemical treatment system for subsequent treatment, and it will be discharged after reaching the standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/78B01D53/50
Inventor 陈前虎
Owner 安徽新北卡化学有限公司
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