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, 2021
Filed:
Sep. 11, 2017
Applicant:
Haldor Topsøe A/s, Kgs. Lyngby, DK;
Inventors:
Niklas Bengt Jakobsson, Kågeröd, SE;
Peter Bo Olsen, Hørsholm, DK;
Per Aggerholm Sørensen, Kgs. Lyngby, DK;
Anders Theilgaard Madsen, Copenhagen S, DK;
Assignee:
HALDOR TOPSØE A/S, Kgs. Lyngby, DK;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 53/86 (2006.01); B01D 53/00 (2006.01); B01D 53/04 (2006.01); B01D 53/50 (2006.01); B01D 53/75 (2006.01); C01B 17/04 (2006.01); C01B 17/56 (2006.01); B01J 21/08 (2006.01); B01J 23/22 (2006.01); D01F 13/02 (2006.01);
U.S. Cl.
CPC ...
B01D 53/8612 (2013.01); B01D 53/002 (2013.01); B01D 53/04 (2013.01); B01D 53/501 (2013.01); B01D 53/75 (2013.01); B01J 21/08 (2013.01); B01J 23/22 (2013.01); C01B 17/0426 (2013.01); C01B 17/0434 (2013.01); C01B 17/56 (2013.01); D01F 13/02 (2013.01); B01D 2251/304 (2013.01); B01D 2251/404 (2013.01); B01D 2251/604 (2013.01); B01D 2251/606 (2013.01); B01D 2253/102 (2013.01); B01D 2255/207 (2013.01); B01D 2255/209 (2013.01); B01D 2255/2027 (2013.01); B01D 2255/20723 (2013.01); B01D 2255/30 (2013.01); B01D 2257/30 (2013.01); B01D 2257/304 (2013.01); Y02P 70/62 (2015.11);
Abstract
A method for cleaning an off-gas from viscose production, essentially containing HS and CS, comprises passing the gas through a catalytic reactor containing a direct oxidation type catalyst, such as VOon silica, to convert HS in the gas to elemental sulfur, SOor mixtures thereof, either via the oxygen present in the gas or via oxygen added to the gas stream. Elemental sulfur and SOare removed from the effluent gas from the catalytic reactor, and the unconverted CSis recycled to the viscose production process.