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Method for purifying (meth)acrylic ester

A technology of acrylate and refining method, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., to achieve the effect of great industrial value

Inactive Publication Date: 2005-01-05
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method that overcomes the problems in the original preparation method, solves the problems caused by the rectification step, and efficiently produces high-purity (meth)acrylate

Method used

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  • Method for purifying (meth)acrylic ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh respectively the 2-ethylhexyl acrylate crude product 30g obtained above and the bis(di-n-butyldithiocarbamate) copper (II) equimolar with p-toluenesulfonic acid existing in the system, put Put it into a container with an inner volume of 100ml equipped with a thermocouple and a gas blowing tube. The container was immersed in an oil bath, and air was blown into the liquid at a rate of 15 ml / min. The liquid temperature in the container was kept at 130°C, and heating was continued for 8 hours. As a result of gas chromatographic analysis every hour, 2-ethylhexanol increased to 0.030% by weight within 1 hour from the start of heating, and no increase in the concentration of 2-ethylhexanol was observed for the next 8 hours.

Embodiment 2

[0042] Except for adding bis(di-n-butyldithiocarbamate) copper (II) in an amount 0.5 times the molar amount of p-toluenesulfonic acid, the result of the heating test was performed in the same manner as in Example 1. The 2-ethylhexanol concentration was 0.090% by weight. The concentration of this alcohol is within the allowable range as a product.

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Abstract

In a process for producing a (meth)acrylic ester by esterifying (meth)acrylic acid and an alcohol in the presence of an acid catalyst, a purification step is conducted which comprises rectifying the reaction mixture in the presence of a heteroatom-containing chelate complex having as the central metal an element in Groups 7 to 12 of the Periodic Table in the longer form to thereby inhibit the (meth)acrylic ester from undergoing transesterification with the hydroxy compound which is a by-product present as an impurity and from yielding an alcohol. Thus, a high-purity (meth)acrylic ester can be produced.

Description

technical field [0001] The present invention relates to the refining method of acrylate or methacrylate (hereinafter collectively referred to as acrylic acid and methacrylic acid as (meth)acrylic acid). In the step of ingredients, to the refined (meth)acrylic acid ester, add a specific chelate complex to inhibit the reaction of alcohol, and obtain a high-purity (meth)acrylic acid industrially ideal refining method. Background technique [0002] Until now, (meth)acrylates have been widely used as monomer components for the preparation of paints, adhesives, and optical materials such as contact lenses. Among them, acrylate is mainly acrylic acid obtained by contact oxidation of propane or propylene, and then esterified. In addition, methacrylate is obtained by acetone cyanohydrin method, new acetone cyanohydrin method, or isobutylene and tert-butanol. The raw material is directly prepared by contact oxidation method, and the methacrylate obtained in these methods is esterifie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/54
CPCC07C67/54
Inventor 矢田修平高崎研二小川宁之铃木芳郎
Owner MITSUBISHI RAYON CO LTD
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