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:
Nov. 24, 2020
Filed:
Jun. 22, 2018
Covestro Deutschland Ag, Leverkusen, DE;
Michael Merkel, Düsseldorf, DE;
Martin Ehrig, Leverkusen, DE;
Manfred Kobylka, Burscheid, DE;
Jan Morbach, Cologne, DE;
Maria Carrascosa Mas, Cologne, DE;
Christian Morten Jens, Cologne, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The present invention relates to a method for producing purified phosgene vapor, comprising the following steps: 1) providing a gas flow obtainable from the reaction of chlorine with carbon monoxide and comprising phosgene and carbon monoxide; 2) one-stage or multi-stage condensation of the gas flow and separation of non-condensable residue gases; 3) one-stage or multi-stage evaporation of the liquid phosgene obtained in step 2) and optional overheating of the produced phosgene vapour, wherein there is an energy integration between one or more of the condensation steps of step 2) and one or more of the evaporation steps in step 3) and the pressure in the last condensation step is between ≥0.2 and ≤6.0 bar higher than in the first evaporation step.