Bayer Materialscience Ag

Bayer Materialscience, LLC

Jeffrey S Bolton

Fritz Pohl

Richard Adamson

Rudolf Uchdorf

Spotswood Miller

Ricardo Serra

Matthias Ehlers

Gary B Solak

Kirk J Bourgeois

Gregory L McCullough

Amber R Hicks

Richard G Hillman

James E Sager

Xiaoyan Wang

Ralf Ochel

Sara DeLucia

Isocyanates are produced by reacting an organic amine with phosgene in process which includes at least three stages. The first stage is carried out in a dynamic mixer. The second stage is carried out in at least one reactor. The third stage is carried out in at least one material separating apparatus. The pressure in the reactor of the second stage must be greater than or equal to the pressure in the dynamic mixer. The pressure in the third stage material separating apparatus must be lower than the pressure in the second stage reactor.

Process for the continuous preparation of isocyanates

The invention provides an improved process for preparing diamines and polyamines from the diphenylmethane series by reacting aniline and formaldehyde in the presence of an acid catalyst, the improvement involving the aniline containing less than about 3 wt. % of diamines and polyamines from the diphenylmethane series, based on the weight of the aniline.

Process for preparing diamines and polyamines from the diphenylmethane series

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Dusseldorf, Germany

Jeffrey S Bolton