Bayer Aktiengesellschaft

Alexandre Timofeev

Helmut Waldmann

Natalja Zubritskaya

Anatoly Bazanov

Gennady Terechtchenko

Klaus Nachtkamp

Jurgen Dahmer

Josef Pedain

Diaminodipropyl ethers and hydroxyaminodipropyl ethers are prepared by catalytic amination of dipropylene glycol.

Process for the preparation of diaminodipropyl ethers and

The present invention relates to a process for preparing 2-methyl-2,4-diaminopentane by introducing acetone, ammonia and hydrogen into a two-zone reactor at a temperature of 20.degree. to 130.degree. C. and a pressure of 30 to 250 bar, wherein the first zone contains a cationic exchange resin containing NH.sub.4.sup..sym. groups or an aluminum oxide and/or silicon oxide catalyst and the second zone contains a hydrogenation catalyst containing nickel.

Process for the preparation of 2-methyl-2,4-diaminopentane

The present invention relates to a process for preparing 1,4-bis(aminomethyl)cyclohexane by reacting a 40 to 80 wt. % aqueous solution of 1,4-bis(hydroxymethyl)cyclohexane with a mixture of hydrogen and ammonia in the presence of a nickel/copper/chromium catalyst at a pressure of 100 to 250 bar and a temperature of 150.degree. to 250.degree. C.

Process for the preparation of 1,4-bis(aminomethyl) cyclohexane

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St. Petersburg, Russia

Alexandre Timofeev