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Process and system for recovering sulfonic acid mother liquor by dewatering

A technology of sulfonic acid mother liquor and sulfonic acid mother liquor, which is applied in the chemical industry, can solve the problems of wasting organic matter, and achieve the effects of saving production costs, strong controllability, and reduced consumption

Active Publication Date: 2013-07-17
JINNENG SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This excess sulfonic acid mother liquor is usually used as low-value waste acid in foundry and other industries, wasting the organic part

Method used

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  • Process and system for recovering sulfonic acid mother liquor by dewatering

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Embodiment Construction

[0013] Attached below figure 1 The present invention is described in detail with specific embodiment:

[0014] according to figure 1 As shown, through the analysis of the components of the sulfonic acid mother liquor and dehydration, the sulfonic acid mother liquor can be concentrated by vacuum distillation and dehydration, and after increasing the concentration of concentrated sulfuric acid in the mother liquor, it can be recycled for the next step At the same time, sulfonic acid crystals can be precipitated for reuse, while the distilled toluene vapor and water vapor can be cooled multiple times and separated from toluene water to obtain toluene, which can be reused in the sulfonation reaction, so as to achieve classification and multiple recycling the goal of.

[0015] Concrete sulfonic acid mother liquor dehydration recovery process is realized by the following steps:

[0016] 1) Distill and dehydrate the sulfonic acid mother liquor under reduced pressure, cool the gene...

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Abstract

The invention discloses a process and system for recovering sulfonic acid mother liquor by dewatering, relating to the field of chemical engineering. In the invention, through dewatering and concentrating the sulfonic acid mother liquor, a mixed acid of a high-concentration sulfuric acid and a sulfonic acid is obtained, and then toluene in the mother liquor is separated for recovery; the obtainedsulfonic acid mother liquor subjected to dewatering and the toluene can be reused in sulfonation reactions; and the sulfonic acid part in the sulfonic acid mother liquor subjected to dewatering can be recycled through sulfonation and crystallization processes, thereby achieving the purpose of carrying out various multi-item recycling on the sulfonic acid mother liquor. By using the process and system disclosed by the invention, the recovery rates of toluene, a sulfuric acid and a sulfonic acid are effectively improved, and the toluene, the sulfuric acid and the sulfonic acid can be reused in sulfonation reactions, so that the consumption of main materials in the process of production is significantly reduced, and the consumption of the toluene is reduced by more than 10%; and the process is good in continuity and strong in controllability, and because of recycling the mother liquor, the emission of the 'three wastes' is reduced, thereby saving the production cost and reducing the pollution to the environment.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a sulfonic acid mother liquor dehydration recovery process and system applied in the process of producing p-toluenesulfonic acid. Background technique [0002] In the process of producing p-toluenesulfonic acid in the chemical industry, toluene is sulfonated with concentrated sulfuric acid as a sulfonating agent, and then p-toluenesulfonic acid is produced by using the principle of partial crystallization selectivity. After the sulfonation reaction, the sulfonic acid is separated by cooling and crystallization Crystals and Mother Liquor. The product of this process has high purity and is widely used, but excessive sulfonic acid mother liquor is inevitably produced in the production. Through the analysis of the composition of the sulfonic acid mother liquor, it contains sulfuric acid (H 2 SO 4 ) 25~40%, sulfonic acid 35~45%, H 2 O15~25%. This excess sulfonic acid mother liquo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/30C07C303/06
Inventor 刘红伟党传升赵洪涛
Owner JINNENG SCI & TECH
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