Covestro Deutschland Ag

Bayer Materialscience Ag

Dirk Weiβenberg

Knud Werner

Ralph Weber

Torsten Erwe

Martin Ehrig

Johannes Leonhäuser

A method for processing hydrogen chloride from isocyanate preparation comprises the steps: a) providing hydrogen chloride; b) purifying the hydrogen chloride provided; and furthermore step c) or step d): c) bringing the purified hydrogen chloride into contact with water and/or with hydrochloric acid which is not saturated with respect to uptake of hydrogen chloride, d) further processing the purified hydrogen chloride to chlorine by partial oxidation. The hydrogen chloride provided in step a) contains organic and/or nitrogen-containing impurities and in step b) the purification is carried out by bringing hydrogen chloride into contact with hydrochloric acid which is saturated to the extent of &#x2265;90% with respect to uptake of hydrogen chloride at least in a first gas scrubber () and circulating this hydrochloric acid at least partially through the first gas scrubber ().

Method for processing hydrogen chloride from isocyanate preparation

Processes comprising: providing an anion exchanger at least partially loaded with hexachlorostannate; and contacting the at least partially loaded anion exchanger with a 1 to 10 wt. % hydrochloric acid solution to regenerate the anion exchanger.

Processes for the regeneration of an anion exchanger loaded with hexachlorostannate

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Leverkusen, Germany

Dirk Weiβenberg