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:
May. 30, 2017
Filed:
Nov. 03, 2015
Applicant:
Valmet Ab, Sundsvall, SE;
Inventors:
Assignee:
VALMET AB, Sundsvall, SE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
D21C 1/02 (2006.01); D21C 1/00 (2006.01); D21C 11/00 (2006.01); D21C 7/12 (2006.01);
U.S. Cl.
CPC ...
D21C 1/02 (2013.01); D21C 1/00 (2013.01); D21C 7/12 (2013.01); D21C 11/00 (2013.01); D21C 11/0007 (2013.01);
Abstract
The method is for producing pulp. More particularly, a displacement batch cooking process comprises recovery of a first treatment liquid by draining of the digester, preferably not using a displacement liquid. The method may preferably be used in a prehydrolysis step, wherein the recovery of the by-products is improved. In the recovery step, after the target P-factor in the prehydrolysis stage is reached, the hydrolysate is withdrawn by draining in at least one phase obtaining a strong first liquid and thereafter any residual hydrolysate may be displaced.