Basf Se Corporation

Thomas A Grzanka

Johannes Jacobs

Steven D Gagnon

Robert A Doerr

Kenneth K Bordelon

Eckhard Stroefer

Heiner Schelling

Ulrich Penzel

Kai Thiele

Matthias Eiermann

Jon S Speier

Dirk Hablawetz

Dave Beckwith

Uwe Storck

William Portwood

Steven Dallas Gagnon

This invention provides a method for purifying a chlorine supply that includes a chlorine component, a bromine component, and nitrogen trichloride. The method includes the steps of introducing the chlorine supply into a vaporizer, heating the chlorine supply in the vaporizer to form a vapor, and introducing the vapor into a distillation system to provide purified chlorine gas, a distillate that includes liquid chlorine and the bromine component, and a bottoms component including the nitrogen trichloride. The method also includes the steps of condensing the vapor in a reflux condenser, heating the condensate in a reboiler, removing the purified chlorine gas from the distillation system, and removing the distillate from the distillation system.

Method for purifying a chlorine supply

The invention relates to a method of measuring entry of water and resulting corrosion in plants for producing isocyanates by reacting phosgene with one or more primary amines in a solvent. The invention further relates to an apparatus for producing such isocyanates, in the work-up section of which probes for monitoring corrosion are arranged in defined places.

Method of measuring entry of water into phosgene-conducting plants

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Baton Rouge, LA, United States of America

Thomas A Grzanka