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:
Sep. 27, 1977
Filed:
Jun. 11, 1975
Applicant:
Inventors:
Allan Geoffrey Jamieson, Ornskoldsvik, SW;
Hans Olof Samuelson, Goteborg, SW;
Leif Ake Smedman, Domsjo, SW;
Kent Ivar Sondell, Ornskoldsvik, SW;
Assignee:
Mo och Domsjo Aktiebolag, Ornskoldsvik, SW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21C / ; D21C / ; D21C / ; D21C / ;
U.S. Cl.
CPC ...
162 37 ; 162 40 ; 162 60 ; 162 63 ; 162 65 ; 162 79 ;
Abstract
Process for improving the selectivity of delignification of lignocellulosic material in the presence of oxygen gas and alkali by maintaining a carbon monoxide content in the gas phase within the range from about 1% to about 12% by volume. The carbon monoxide concentration is maintained by withdrawing carbon monoxide and oxygen gas from the delignification, and separating and recycling withdrawn oxygen gas.