Degussa Aktiengesellschaft

Heinrich Petsch

Guenter Prescher

Andreas Grund

Georg Boehme

Willi Hofen

Klaus Huthmacher

Horst Weigel

Stephan Rautenberg

Hans-Albrecht Hasseberg

Method for the continuous preparation of methionine or methionine

Aliphatic epoxides of the formula: ##STR1## can be prepared in a technically efficient manner from the corresponding olefins by means of perpropionic acid in a benzene solution. The benzene solution can also be 1.5 weight percent of hydrogen peroxide, 1.5 weight percent of water and about 800 ppm of mineral acid.

Process for the treatment of aliphatic epoxides

The diepoxide of the formula: ##STR1## can be prepared from the corresponding diolefin in a technically simple manner by means of perpropionic acid in a benzene solution. The solution can also be employed in unpurified form with certain maximum contents of 1.5 weight percent of hydrogen peroxide, 1.5 weight percent of water, and of about 800 ppm of mineral acid.

Process for the preparation of a cycloaliphatic diepoxide

The continuous preparation of .DELTA. 3-tetrahydrobenzoic acid- .DELTA. 3-tetrahydrobenzyl ester by reaction of 3-cyclohexene-1-carboxaldehyde is disclosed. The reaction is carried out in the presence of an aluminum mixed alcoholate, in which half of the alcohol components consists of isopropylate groups and the other half of sec-butylate groups.

Process for the preparation of .DELTA. 3-tetrahydrobenzoic acid- .DELTA.

A continuous process for the production of 3-cyclohexene-1-carboxaldehyde by reaction of acrolein with butadiene at an elevated temperature and increased pressure is described in which good yields are obtained by establishing the weight ratio of the starting substances fed per time unit into a circulation reactor in relation to the reaction mixture circulated per time unit in the range of 1:5 to 1:60 and by carrying out a secondary reaction in successive reactors.

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Hanau, Germany

Heinrich Petsch