Method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid

A technology for carbonyl compounds and carboxylic acid amides, applied in the field of preparing carboxylic acid amides, can solve problems such as poor overall efficiency, and achieve the effects of low energy use and extended service life
CN102232064AActive Publication Date: 2011-11-02ROHM G M B H
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ROHM G M B H
Publication Date
2011-11-02

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Abstract

The invention relates to a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid, comprising the steps of A) reacting a carbonyl compound with hydrocyanic acid to produce a hydroxycarboxylic acid nitrile, B) hydrolysis of the hydroxycarboxylic acid nitrile obtained in step A) in the presence of a catalyst comprising manganese dioxide, wherein a molar excess of carbonyl compound is used in relation to the hydrocyanic acid to react the carbonyl compound with hydrocyanic acid according to step A), and the reaction mixture obtained in step A) is not purified by distillation before the hydrolysis according to step B) is carried out. The invention furthermore relates to a method for producing alkyl(meth)acrylates from polymers, moulding compounds and moulded bodies, wherein a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid is carried out in accordance with the method described above.
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Description

technical field

[0001] The present invention relates to a process for the preparation of carboxylic acid amides from carbonyl compounds and hydrocyanic acid. The invention also relates to processes for the preparation of alkyl (meth)acrylates, polymers, molding materials and plastic moldings. Background technique

[0002] The preparation of carboxylic acid amides by hydrolysis of carboxylic acid nitriles in the presence of catalysts comprising manganese dioxide has been prior art for a long time. Carboxamides are required in many cases as intermediates in industry. For example α-hydroxyisobutyramide can be used for the preparation of methacrylic acid or methacrylate esters, especially methyl methacrylate.

[0003] A particularly preferred process for the preparation of carboxylic acid amides is described in detail in WO 2008 / 061822 A1.

[0004] Although the teachings of the documents detailed above have led to relatively inexpensive preparations, there is a constant need ...

Claims

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