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Industrial synthetic process for cis-2-butenic acid

A crotonic acid and process technology, which is applied in the field of industrial synthesis of cis-2-butenoic acid, can solve problems such as inability to produce cis-structure crotonic acid, and achieve the effects of improving quality grade, high risk and low investment cost

Inactive Publication Date: 2009-02-25
仪征新蕾香精香料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present the production of domestic crotonic acid is limited by technology and technological level, can only produce the crotonic acid of the trans structure, can't produce the crotonic acid (cis 2-butenoic acid) product of the cis structure, and only one company in Switzerland can do it abroad Production, which uses the sodium mercury reduction synthesis production process route

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] 1. When 1 mol mass of butanone solution is heated to 75-85°C, bromine gas is slowly introduced into the solution and stirred at a stirring speed of about 120-130rpm / min to carry out bromination reaction to generate 1·3-dibromodi Butanone product yield is 99.2%.

[0022] 2. Add NaOH alkaline solution to 1.3-dibromodibutyl ketone and heat to 116-122°C. Under normal pressure, when the stirring speed is 120-135rpm / min, add copper acetate-cobalt acetate evenly solution, after continuous oxidation for 6 to 8 hours, to obtain maleic acid. A mixture of sodium bromide and water. In the reaction, the mass molar ratio of 1.3-dibromodibutanone to sodium hydroxide is 1:2, the amount of catalyst copper acetate-cobalt acetate added is 0.1-0.3mol, and the yield of cis-2-butenoic acid is 96 %, the content in the mixed solution is 66%.

[0023] 3. The above mixed solution is fed with 0.02-0.03mol of CO at 50°C-70°C under normal pressure 2 and 0.01mol of metal magnesium to extract and...

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Abstract

The industrial cis-2-butenic acid producing process includes the reaction of butanone as main material and led in bromine gas under certain temperature and pressure to prepare bromide, oxidation in the presence of flavone acetate and cobalt acetate to eliminating bromine, reduction in the presence of metal magnesiu, and final extracting fractionation to obtain cis-2-butenic acid. Compared with available sodium-mercury reduction process, the present invention has simple technological process, high yield, no environmental pollution and other advantages.

Description

technical field [0001] The invention relates to an industrial production method of chemical products. Background technique [0002] Crotonic acid is an important chemical basic material and pharmaceutical intermediate, which can be widely used in the preparation of various resin coatings, fungicides, plasticizers and drugs, and even as a raw material for polyvinyl acetate coatings. The copolymer of this product and vinyl acetate can be used as a hot melt agent for book binding, as a coating and paper for wallpaper, as an adhesive for laminated boards, and as a component of film developer and electrostatic copying solution. But at present the production of domestic crotonic acid is limited by technology and technological level, can only produce the crotonic acid of the trans structure, can't produce the crotonic acid (cis 2-butenoic acid) product of the cis structure, and only one company in Switzerland can do it abroad Production, which uses the sodium mercury reduction syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C57/08C07C51/00
Inventor 包生皓王立新
Owner 仪征新蕾香精香料有限公司