Basf Corporation

Basf Aktiengesellschaft

Hans V Schwarz

Franz Merger

Wolfgang Schwarz

Peter Magnussen

Erwin Brunner

Andreas Otterbach

Otto Mattner

Eckhardt Brandt

K Edward Nuernberg

Reagent grade hydrochloric acid having an iron content of less than 200 p.p.b. is made from an industrial organic isocyanate manufacturing process by removing hydrogen chloride from organic isocyanates produced in the reaction between phosgene and an organic amine, converting the hydrogen chloride to concentrated aqueous hydrochloric acid, and contacting the acid with a strongly basic anion exchange resin.

Process for manufacturing isocyanates and producing reagent grade

A multistep process for the continuous preparation of organic polyisocyanates, preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to give monomeric polyurethanes and pyrolyzing the latter involves separating the resultant polyisocyanates and worthless residues in certain reaction steps and recycling the reusable by-products into earlier steps.

Multistep, continuous preparation of organic polyisocyanates

The invention relates to a process for removing water traces from a liquid phosgene stream in chemical processes which employ a phosgenation step. Water traces are removed from a liquid phosgene stream containing at least 60 weight percent phosgene by contacting the stream with a strongly basic macroreticular anion exchange resin which catalyzes the reaction between phosgene and the water traces.

Removal of water from a phosgene recycle stream

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Baton Rouge, LA, United States of America

Hans V Schwarz