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. 26, 2020
Filed:
Aug. 31, 2016
Applicant:
Kemira Oyj, Helsinki, FI;
Inventors:
Jonni Ahlgren, Espoo, FI;
Sakari Halttunen, Espoo, FI;
Jussi Ruotsalainen, Espoo, FI;
Maria Luhtala, Kirkkonummi, FI;
Miia Niemelä, Helsinki, FI;
Assignee:
Kemira Oyj, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F 1/52 (2006.01); B01D 21/01 (2006.01); C02F 1/56 (2006.01); C02F 103/28 (2006.01); C02F 101/30 (2006.01);
U.S. Cl.
CPC ...
C02F 1/5263 (2013.01); B01D 21/01 (2013.01); C02F 1/56 (2013.01); C02F 2101/30 (2013.01); C02F 2103/28 (2013.01);
Abstract
A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises —obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and —adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.