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:
Dec. 14, 2010
Filed:
Oct. 29, 2004
Chad L. Felch, Mosinee, WI (US);
Richard W. Lehmann, Birnamwood, WI (US);
Todd J. Wingers, Rothschild, WI (US);
Bruce L. Brandenburg, Wausau, WI (US);
William M. Copa, Weston, WI (US);
Chad L. Felch, Mosinee, WI (US);
Richard W. Lehmann, Birnamwood, WI (US);
Todd J. Wingers, Rothschild, WI (US);
Bruce L. Brandenburg, Wausau, WI (US);
William M. Copa, Weston, WI (US);
Siemens Water Technologies Holding Corp., Warrendale, PA (US);
Abstract
A wet oxidation process is used to control the concentration of reduced sulfur compounds from a viscose process. The wet oxidation process oxidizes the reduced sulfur compounds to convert such reduced sulfur compounds to an alkali sulfate and/or thiosulfate species. The alkali sulfate stream is recycled to the viscose process. Oxidation is performed under elevated temperature and pressure conditions such that the offgas has an oxygen concentration of between about 2% to 18% and the alkali sulfate stream has a pH of about 2 to 10.