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:
Nov. 04, 2014
Filed:
Aug. 21, 2013
Applicant:
University of New Brunswick, Fredericton, CA;
Inventors:
Yonghao Ni, Fredericton, CA;
Guojun Kang, Fredericton, CA;
Assignee:
University of New Brunswick, Fredericton, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C 3/06 (2006.01); D21C 3/26 (2006.01);
U.S. Cl.
CPC ...
D21C 3/266 (2013.01);
Abstract
Systems and methods are provided for refining and reclaiming rejects in a sulfite pulping process. Wood chips and sulfite cooking liquor are provided to a digester for delignification. The slurry obtained from the digester is screened to obtain a reject portion containing sulfite rejects. The sulfite rejects are disintegrated in a refiner, such that the rejects are refined to a freeness suitable for digestion in a subsequent re-cooking step. Refined rejects are then returned to the digester for re-cooking with wood chips.