Ruhrchemie Aktiengesellschaft

Norbert Breitkopf

Boy Cornils

Peter Lappe

Helmut Springer

Ernst Wiebus

Hanswilhelm Bach

Heinz Kalbfell

Franz Thonnessen

Georg Dambkes

Wolfgang Hofs

A process for the purification of propanediol-1,3, especially when produced by hydration of acrolein with water, including extracting the diol with cyclohexane. Preferably, from 2 to 10 parts by weight of cyclohexane per part by weight of diol is used. The purification is usually carried out below 60.degree. C.

Process for purifying propanediol-1,3

Preparation of 2,2-dimethylpropanediol-1,3 by the aldol addition of isobutyraldehyde and formaldehyde using tri-n-propylamine as a catalyst, followed by hydrogenation of the reaction mixture, and subsequent distillation of the hydrogenation product in the presence of isobutanol and water.

Process for the preparation of 2,2-dimethylpropanediol-1,3

The present invention relates to a method for purifying N,N-dimethylaminopropylamine containing 1,3-diaminopropane as an impurity. Dimethylaminopropionitrile is formed by adding dimethylamine to acrylonitrile, and is then converted by subsequent hydrogenation and distillation into N,N-dimethylaminopropylamine. The impurity 1,3-diaminopropane is removed by adding a metal salt of a transition element which forms a stable complex with the 1,3-diaminopropane.

Method for purifying N,N-dimethylaminopropylamine

Growing community of inventors

Oberhausen, Germany

Norbert Breitkopf