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A kind of post-processing method of pivalic acid synthesis reaction solution

A synthesis reaction and pivalic acid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of low efficiency and high pressure in the treatment section, achieve low energy consumption, reduce the pressure of the section, and achieve good separation effect Effect

Active Publication Date: 2022-07-26
ZHENGZHOU TIANYI EXTRACTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a post-treatment method for pivalic acid synthesis reaction liquid to solve the problems of high pressure and low efficiency in the subsequent processing section caused by the post-treatment method of pivalic acid synthesis reaction liquid in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using isobutene and carbon monoxide as raw materials, using concentrated sulfuric acid as a catalyst to prepare pivalic acid, after the high-pressure reaction is completed, the reaction solution is used for subsequent use.

[0026] (1) adopt compound extractant to extract pivalic acid from reaction solution: pass reaction solution and compound extractant into CWL-M centrifugal extractor, and make the volume ratio of compound extractant and reaction solution be 1: (1-5), adopt 3-6 stage extraction, obtain pivalic acid extract and raffinate after separation, and the raffinate can directly recover the catalyst used for pivalic acid synthesis. Wherein, the compound extraction agent includes a main extraction agent and a co-extracting agent, the main extraction agent is selected from one or more combinations of dichloromethane, chloroform or chlorobenzene, and the volume fraction of the main extraction agent is 60-90 %; the co-extracting agent is selected from a combination ...

Embodiment 2

[0031] Using isobutylene and carbon monoxide as raw materials, and using concentrated sulfuric acid as a catalyst to prepare pivalic acid, after the high-pressure reaction is completed, the reaction solution is detected. The volume fraction of pivalic acid in the reaction solution is 20%, and the mass fraction of concentrated sulfuric acid is 92%. The reaction solution is processed according to the following steps:

[0032] (1) adopt compound extractant to extract pivalic acid from reaction solution: pass reaction solution and compound extractant into CWL-M centrifugal extractor, and make the volume ratio of compound extractant and reaction solution be 1: 1. Adopt 3-stage extraction to obtain pivalic acid extract and raffinate after separation, and the raffinate (concentrated sulfuric acid) can directly recover the catalyst used for the synthesis of pivalic acid. The compound extractant includes 60% dichloromethane (volume fraction) and 40% ethyl acetate (volume fraction). Aft...

Embodiment 3

[0037] Using isobutylene and carbon monoxide as raw materials, and using concentrated sulfuric acid as a catalyst to prepare pivalic acid, after the high-pressure reaction is completed, the reaction solution is detected, and the volume fraction of pivalic acid in the reaction solution is 25%, and the mass fraction of concentrated sulfuric acid is 85%. The reaction solution is processed according to the following steps:

[0038] (1) adopt compound extractant to extract pivalic acid from reaction solution: pass reaction solution and compound extractant into CWL-M centrifugal extractor, and make the volume ratio of compound extractant and reaction solution be 1: 5. Adopt 6-stage extraction to obtain pivalic acid extract and raffinate after separation, and the raffinate (concentrated sulfuric acid) can directly recover the catalyst used for the synthesis of pivalic acid. Wherein, the compound extractant includes 70% chloroform (volume fraction) and 30% isopropyl ether (volume frac...

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Abstract

The invention belongs to the technical field of pivalic acid synthesis, and in particular relates to a post-processing method for a pivalic acid synthesis reaction solution. The post-processing method of the pivalic acid synthesis reaction solution is that after the pivalic acid synthesis reaction is completed, a compound extractant is added to the reaction solution, extracted and separated to obtain a pivalic acid extract and a raffinate, and the pivalic acid is rectified. The acid extraction solution is to obtain the pure product of pivalic acid; the compound extraction agent includes a main extraction agent and a co-extracting agent, and the main extraction agent is selected from any one of methylene chloride, chloroform or chlorobenzene or The co-extracting agent is selected from any one or more of cyclohexane, ethyl acetate or isopropyl ether. The post-treatment method of the pivalic acid synthesis reaction solution of the present invention produces less waste water, greatly reduces the pressure on environmental protection, can realize continuous operation at the same time, and has the advantages of high efficiency, environmental protection, low energy consumption, low production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of pivalic acid synthesis, and in particular relates to a post-processing method for a pivalic acid synthesis reaction solution. Background technique [0002] Pivalic acid is an important chemical raw material, which can be used in the production and manufacture of adhesives, medicines, initiators, pesticides, fragrances, etc. It is the raw material for the synthesis of many drugs and fragrances, and can be used as a stabilizer for polymer materials such as polyvinyl chloride and a catalyst for some chemical reactions. [0003] In industry, isobutylene and carbon monoxide are generally used as raw materials, and concentrated sulfuric acid is used as a catalyst to synthesize pivalic acid under a certain pressure. After the high-pressure reaction is completed, water is generally added to hydrolyze the reaction solution to separate the pivalic acid from the concentrated sulfuric acid, and then a high-purity pi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/48C07C51/44C07C51/42C07C53/128
CPCC07C51/48C07C51/44C07C51/42C07C53/128
Inventor 高艳芳李瑞琛杨鹏飞张书锋王利军
Owner ZHENGZHOU TIANYI EXTRACTION TECH
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