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Method for recovering hydrochloric acid from HCL gas during the production process of benzene sulfochloride

A production process and gas recovery technology, applied in the direction of chlorine/hydrogen chloride, etc., can solve problems such as polluted environment, smog, high treatment costs, etc., and achieve the effects of improving economic benefits, solving environmental protection problems, and solving leakage problems

Active Publication Date: 2008-05-14
镇江惠隆化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also a small amount of gas released into the air, causing mist, choking people's noses, and seriously polluting the environment
About 700kg (converted) of 31% hydrochloric acid is lost per ton of product. According to the output of 6 tons per day, 4.2 tons of 31% hydrochloric acid is discharged as waste water every day. After entering the waste water treatment station, it needs to be treated with 30% NaOH solution. , each ton of waste water needs to consume about 700kg of liquid caustic soda, liquid caustic soda is calculated at 550 yuan / ton, and the treatment cost of each ton of waste water is nearly 400 yuan, which is relatively large

Method used

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  • Method for recovering hydrochloric acid from HCL gas during the production process of benzene sulfochloride
  • Method for recovering hydrochloric acid from HCL gas during the production process of benzene sulfochloride

Examples

Experimental program
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Effect test

Embodiment 1

[0008] Hydrogen chloride gas is produced during sulfonation, and hydrogen chloride gas is also produced during dilution (decomposition of benzenesulfonyl chloride and hydrolysis of excess chlorosulfonic acid),

[0009]

[0010] HOSO 2 Cl+H 2 O——H 2 SO 4 +HCl

Embodiment 2

[0012] The main technical and economic indicators and social and economic benefits achieved after implementation.

[0013] Quality indicators of benzenesulfonyl chloride products: benzenesulfonyl chloride content ≥ 99.0%, free acid ≤ 0.08%, diphenyl sulfone ≤ 0.10%, chromaticity 25-20; after adopting a new process, not only the leakage problem is solved, but also the A large amount of waste hydrochloric acid cannot be recycled and used, but can only be discharged as wastewater, which not only causes a lot of pollution, but also increases the cost of treatment and improves economic benefits after entering the wastewater treatment station. The recovered hydrochloric acid with a concentration of 31% can increase the economic benefit of nearly 1 million yuan.

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PUM

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Abstract

The invention relates to a method for HCI hydrochloric acid gas recovery in the process of producing benzene sulfone chloride; based on the planar absorption apparatus, the prior positive pressure chlorosulfonation is changed into a bleed chlorosulfonation by adding a water pump and a circulation water tank at the end of tail gas, so that the pressure inside a reaction kettle and a pipeline can be reduced; the unabsorbed HCI tail gas is completely absorbed by the water pump cyclically through implementing a circulation absorption technology in the state of negative pressure. The invention has the advantages that the HCI gas which is generated in the process of sulphonation can be absorbed cyclically by adopting the negative pressure reactivity, so the smoky HCI gas in the air is removed; based on the planar absorption apparatus, the water pump and the circulation tank are added for implementing the circulation absorption under the state of negative pressure, when the absorbed concentration reaches 31% (the specific gravity is up to 1.155 which is measured by a hydrometer), the reclamation can be implemented; the invention can be used in manufacturing the products of rubber strengthening agent white black carbon so as to improve the economic benefit; the invention also can be better to solve the problem in environmental protection.

Description

technical field [0001] The invention relates to a method for recovering hydrochloric acid by using hydrogen chloride (HCl) gas in the production process of benzenesulfonyl chloride, which belongs to the technical field of fine chemicals. Background technique [0002] In the production process of benzenesulfonyl chloride, the sulfonation reaction is a very important process. The traditional process uses positive pressure chlorosulfonation, and pure benzene is slowly added dropwise to chlorosulfonic acid. During the sulfonation reaction process, the Hydrogen chloride (HCl) gas is released, and the release amount per ton of product is about 300kg. Due to the strong hydrophilic force of hydrogen chloride (HCl) gas, the yield is about 70% by plane absorption, and the remaining 30% hydrogen chloride (HCl) ) gas is poured through the tail gas pouring tower, and a large amount of hydrochloric acid waste water flows into the waste water pool. There is also a small amount of gas rele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/01
Inventor 刘兴照朱康洋
Owner 镇江惠隆化工有限公司
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