Basf Aktiengesellschaft

Badische Anilin- & Soda-fabrik Aktiengesellschaft

Hans-Ingo Joschek

Herwig Hoffmann

Siegfried Winderl

Wolfgang Reiss

Klaus Hess

Hans Christoph Horn

Roland Spahl

Juergen Dehler

Ingo H Dorn

Rudolf Schnur

Gunter Dinkhauser

Hans Joachim Pistor

Gotthilf Wenner

A process for decomposing organohalogen compounds which are present in dust-laden gases which have a carbon content of less than 0.6% by weight, by oxidative breakdown with the aid of solid catalysts suitable for this purpose, wherein

Decomposition of organohalogen compounds in dust-laden-waste gases

Butynediol is prepared by reacting acetylene and formaldehyde in contact with a heavy metal acetylide as catalyst, in the liquid phase by the Reppe method. Acetylene is fed upwardly through a suspension of the catalyst in formaldehyde at such a rate that it is virtually completely consumed and a liquid zone containing no catalyst is formed above the suspension.

Manufacture of butynediol

Production of 4,4'-diphenylmethane diisocyanate and a mixture of diisocyanates and polyisocyanates by the phosgenation of pure 4,4'-diaminodiphenylmethane and a mixture of diamines and polyamines. 4,4'-Diaminodiphenylmethane is obtained by distillation of the mixture of products obtained from the reaction of aniline with formaldehyde and crystallization of the distillate from a solvent. The combined distillation residue and mother liquor from the crystallization form the mixture for reaction with phosgene to produce a mixture of diisocyanates and polyiisocyanates. This process produces a highly pure 4,4'-diphenylmethane diisocyanate which is particularly suitable for the production of polyurethanes serving as intermediates in the manufacture of rigid foams or as glue.

Manufacture of 4,4'-diphenylmethane diisocyanate and a mixture of

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Mannheim, Germany

Hans-Ingo Joschek