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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.:

US 9989476 B1

PDFFull Text
Date of Patent:
Jun. 05, 2018

Filed:

Nov. 18, 2014

Optical determination of anionic charge in a process stream

Applicant:

Kemira Oyj, Helsinki, FI;

Inventors:

Lari Vähäsalo, Espoo, FI;

Iiris Joensuu, Espoo, FI;

Marjatta Piironen, Espoo, FI;

Assignee:

KEMIRA OYJ, Helsinki, FI;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Jennifer Wecker

Int. Cl.
CPC ...
G01N 21/85 (2006.01); B03B 7/00 (2006.01); C09B 67/32 (2006.01); G01N 21/27 (2006.01); G01N 21/59 (2006.01); G01N 21/82 (2006.01); G01N 31/22 (2006.01); G01N 33/18 (2006.01); D21H 23/08 (2006.01); G01N 15/06 (2006.01); G01N 21/31 (2006.01); G01N 33/34 (2006.01); G01N 21/78 (2006.01); D21H 23/78 (2006.01); C09B 21/00 (2006.01); G01N 15/00 (2006.01); C02F 1/52 (2006.01); G01N 21/83 (2006.01); G01N 21/84 (2006.01); G01N 27/447 (2006.01); G01N 21/77 (2006.01);
U.S. Cl.
CPC ...
G01N 21/85 (2013.01); B03B 7/00 (2013.01); C09B 21/00 (2013.01); C09B 67/0075 (2013.01); D21H 23/08 (2013.01); D21H 23/78 (2013.01); G01N 15/06 (2013.01); G01N 21/274 (2013.01); G01N 21/314 (2013.01); G01N 21/59 (2013.01); G01N 21/78 (2013.01); G01N 21/82 (2013.01); G01N 31/22 (2013.01); G01N 33/182 (2013.01); G01N 33/343 (2013.01); C02F 1/5209 (2013.01); G01N 21/83 (2013.01); G01N 27/447 (2013.01); G01N 2015/0053 (2013.01); G01N 2015/0092 (2013.01); G01N 2015/0693 (2013.01); G01N 2021/3155 (2013.01); G01N 2021/7783 (2013.01); G01N 2021/8411 (2013.01); G01N 2021/8416 (2013.01); G01N 2021/8557 (2013.01); G01N 2201/127 (2013.01); G01N 2201/129 (2013.01);
Abstract

The present invention concerns a method of optical measurement of an aqueous stream, and of processing the results of the measurement in order to determine the anionic charge of the stream, the method being carried out by measuring the light absorption of the stream and predicting the amount of anionic groups in the stream using a mathematical processing, such as mathematical calculations. Particularly, the method includes the steps of adding an amount of a cationic dye to the aqueous stream, measuring the light absorption spectra of the obtained dye-containing stream, and processing the obtained light absorption spectrum using said mathematical processing in order to obtain the anionic charge. The invention also concerns the use of the obtained spectrum in determining the turbidity of the stream, as well as a device suitable for use in carrying out the method.

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