The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2019
Filed:
May. 27, 2015
Covestro Deutschland Ag, Leverkusen, DE;
Ralph Weber, Leichlingen, DE;
Martin Ehrig, Leverkusen, DE;
Johannes Leonhäuser, Bergisch Gladbach, DE;
Dirk Weiβenberg, Leverkusen, DE;
COVESTRO DEUTSCHLAND AG, Leverkusen, DE;
Abstract
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 ≥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 ().