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:
Aug. 01, 2017
Filed:
Aug. 13, 2015
Applicant:
Upm-kymmene Corporation, Helsinki, FI;
Inventor:
Mauno Miettinen, Lappeenranta, FI;
Assignee:
UPM-KYMMENE CORPORATION, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C 11/10 (2006.01); B01J 3/02 (2006.01); B01J 3/04 (2006.01); B01J 3/00 (2006.01); C07G 1/00 (2011.01); D21C 11/00 (2006.01); D21C 11/04 (2006.01);
U.S. Cl.
CPC ...
D21C 11/10 (2013.01); B01J 3/00 (2013.01); B01J 3/02 (2013.01); B01J 3/042 (2013.01); C07G 1/00 (2013.01); D21C 11/0007 (2013.01); D21C 11/04 (2013.01);
Abstract
In a method for the continuous precipitation of lignin from black liquor black liquor is provided so as to flow as a pressurized flow in a reactor with a dwell time of less than 300 s. An acidifying agent selected from the group of carbon dioxide, acid and their combinations is led to the flow at one or more feeding sites to lower the pH of black liquor. The pH is allowed to decrease by the effect of the acidifying agent in the pressurized flow to the precipitation point of lignin, the pressure of the pressurized flow is abruptly released, and lignin particles are separated from black liquor.