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:
Jul. 07, 2009
Filed:
Feb. 26, 2004
Bill L. Brady, Jr., Duesseldorf, DE;
Guenther Weymans, Kuerten-Bechen, DE;
Berthold Keggenhoff, Krefeld, DE;
Friedhelm Steffens, Leverkusen, DE;
Bill L. Brady, Jr., Duesseldorf, DE;
Guenther Weymans, Kuerten-Bechen, DE;
Berthold Keggenhoff, Krefeld, DE;
Friedhelm Steffens, Leverkusen, DE;
Bayer MaterialScience LLC, Pittsburgh, PA (US);
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
High boiling contaminants such as chloro-aromatic compounds are removed from a gas by compressing the gas containing the contaminant, cooling the compressed gas to reduce the temperature of the gas to at least 20° C. above the outlet temperature of a second cooling stage but above the freezing point of the highest melting compound in the first cooling stage, further cooling the gas in a second cooling stage to at least −20° C., returning cooled gas from the second cooling stage to the first cooling stage, and recovering condensate streams which contain the contaminant compound from the first and second cooling stages. An apparatus suitable for carrying out this process is also disclosed. The process of the present invention is particularly useful for removing chloro-aromatic compounds from anhydrous hydrogen chloride gas.