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:
Jul. 14, 2015
Filed:
Aug. 05, 2009
Applicants:
Jan-willem Brouwer, Willich, DE;
Jens Krömer, Düsseldorf, DE;
Inventors:
Jan-Willem Brouwer, Willich, DE;
Jens Krömer, Düsseldorf, DE;
Assignee:
Henkel AG & Co. KGaA, Duesseldorf, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F 1/42 (2006.01); C02F 1/44 (2006.01); C02F 1/52 (2006.01); C02F 1/66 (2006.01); C23C 22/86 (2006.01); B01D 61/04 (2006.01); C02F 1/00 (2006.01); C02F 101/20 (2006.01); C02F 103/16 (2006.01);
U.S. Cl.
CPC ...
C02F 1/441 (2013.01); C02F 1/42 (2013.01); C02F 1/66 (2013.01); C23C 22/86 (2013.01); C02F 2001/007 (2013.01); C02F 2101/20 (2013.01); C02F 2103/16 (2013.01);
Abstract
A method for recovering demineralized water from zirconium-containing rinse water having a pH lower than 6.0, wherein a) the rinse water has added to it an aqueous solution of Ca(OH)containing no more than 0.1 wt % undissolved Ca(OH), in a quantity such that the pH of the rinse water rises to a value in the range from 6.2 to 8.0, b) a precipitate that forms is separated from the rinse water, and c) the rinse water from which the precipitate was removed in step b) is subjected to an ion exchange method or to reverse osmosis.