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:
Jan. 11, 2005
Filed:
Apr. 11, 2002
Applicants:
Hakan Dahllof, Edsvalla, SE;
Martin Ragnar, Karlstad, SE;
Inventors:
Hakan Dahllof, Edsvalla, SE;
Martin Ragnar, Karlstad, SE;
Assignee:
Kvaerner Pulping AB, Karlstad, SE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
D21C 9147 ;
U.S. Cl.
CPC ...
Abstract
A system and process for the oxygen delignification of pulp consisting of a lignocellulose-containing material that has a mean concentration of 8-18% pulp consistency. The oxygen delignification takes place in a first stage with a short dwell time of about 3-6 minutes, at a low temperature of about 85° C. and under a low pressure of approximately 0-4 bar. A concluding stage has a longer dwell time of about 50-90 minutes, at a higher temperature of approximately 100° C. and under a higher pressure of about 8-10 bar.