Post-treatment method of pivalic acid synthesis reaction solution

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

Active Publication Date: 2020-06-12
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] The pivalic acid is prepared by using isobutene and carbon monoxide as raw materials and concentrated sulfuric acid as a catalyst. After the high-pressure reaction is completed, the reaction liquid is used for standby.

[0026] (1) Adopt compound extractant to extract pivalic acid from reaction solution: pass reaction solution and compound extractant in the 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 raffinate can directly reclaim the catalyst that is used for pivalic acid synthesis. Wherein, the composite extraction agent includes a main extraction agent and a co-extraction 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 %; co-extracting agent is selected from one or more com...

Embodiment 2

[0031] Taking isobutylene and carbon monoxide as raw materials, using concentrated sulfuric acid as a catalyst to prepare pivalic acid, after the high pressure reaction, 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 was processed according to the following steps:

[0032] (1) Adopt compound extractant to extract pivalic acid from reaction solution: pass reaction solution and compound extractant in the CWL-M centrifugal extractor, and make the volume ratio of compound extractant and reaction solution be 1: 1. Three-stage extraction is used to obtain pivalic acid extract and raffinate after separation, and the raffinate (concentrated sulfuric acid) can be directly recovered as a catalyst for pivalic acid synthesis. Wherein, the compound extractant includes 60% dichloromethane (volume fraction) and 40% ethyl acetate (volume fraction), and aft...

Embodiment 3

[0037] Taking isobutylene and carbon monoxide as raw materials, using concentrated sulfuric acid as a catalyst to prepare pivalic acid, after the high-pressure reaction, 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 was processed according to the following steps:

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

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Abstract

The invention belongs to the technical field of pivalic acid synthesis, and particularly relates to a pivalic acid synthesis reaction liquid post-treatment method. The post-treatment method of the pivalic acid synthesis reaction liquid comprises the following steps: after the pivalic acid synthesis reaction is finished, adding a compound extraction agent into the reaction liquid for extraction andseparating the extract to obtain a pivalic acid extraction liquid and a raffinate, and rectifying the pivalic acid extraction liquid to obtain a pure pivalic acid product. The compound extraction agent comprises a main extraction agent and a synergistic extraction agent, wherein the main extraction agent is selected from any one or more of dichloromethane, trichloromethane or chlorobenzene, and the synergistic extraction 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 liquid produces lesswastewater, greatly reduces the environmental protection pressure, can realize continuous operation, 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-treatment method for a pivalic acid synthesis reaction liquid. 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, spices, etc. It is a raw material for the synthesis of many drugs and spices, and can be used as a stabilizer for polymer materials such as polyvinyl chloride and a catalyst for some chemical reactions. [0003] In industry, isobutene and carbon monoxide are generally used as raw materials and concentrated sulfuric acid 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 pivalic acid from concentrated sulfuric acid, and then high-purity pivalic acid products are obtained b...

Claims

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Application Information

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Patent Type & Authority Applications(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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