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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

Active Publication Date: 2011-11-02
ROHM G M B H
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of using distilled reaction mixtures, the service life of the catalyst can be significantly improved, but wherein the overall efficiency of the process is thereby deteriorated due to the energy consumption caused by the distillation

Method used

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

Examples

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Embodiment 1

[0217] Preparation contains 1mol HCN, 2.5mol acetone and 200ppm Li 2 O, and react the mixture at 20°C until equilibrium is established. The reaction mixture obtained contained 47.7% by weight of acetone cyanohydrin and 51.5% by weight of acetone. The HCN content is below 8000 ppm.

[0218] The mixture of compositions was continuously transferred to a hydrolysis reactor where 38.6% by weight of water was added. Here, the HCN content remains essentially unchanged.

[0219] Water is added partly from the reflux obtained from the bottom of the column during the purification of the reaction mixture after the hydrolysis of the acetone cyanohydrin. The hydrolysis uses MnO 2 Catalyst performed, the MnO 2 Catalysts are described in detail, for example, in WO 2008 / 061822. Air was used to stabilize the catalyst as described in Example 1 of publication WO 2008 / 061822. The pH value is 9.0.

[0220] From the reaction mixture obtained after the hydrolysis, the carboxylic acid amide i...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/06C07C253/30C07C67/327C07C253/06C07C255/13C07C69/54
CPCC07C231/065C07C231/14C07C231/06C07C253/00C07C233/09C07C255/16
Inventor A·迈M·克斯特纳J·贝克尔J·沙伦贝格H·西格特B·福格尔
Owner ROHM G M B H
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