Sergey V Shevchenko

US Patent:

6440327, Aug 27, 2002

Filed:

Jan 31, 2001

Appl. No.:

09/774413

Inventors:

Sergey M. Shevchenko - Lisle IL
Prasad Y. Duggirala - Naperville IL

Assignee:

Ondeo Nalco Company - Naperville IL

International Classification:

C02F 502

US Classification:

252175, 562409, 562410, 562411, 562412, 562419

Abstract:

Compositions and methods for inhibiting scale are provided. Pursuant to the present invention, a composition for inhibiting scale is provided that includes a carbohydrate polymer having both nitrogen-containing groups and carboxyl groups. The nitrogen-containing groups include amino groups, amido groups and mixtures thereof. The present invention has been found useful for inhibiting scale in industrial waters, such as, pulp bleach plant process waters which contain calcium oxalate and barium sulfate scale.

US Patent:

20140027079, Jan 30, 2014

Filed:

Jul 27, 2012

Appl. No.:

13/560771

Inventors:

Xiaojin Harry Li - Palatine IL, US
Paul F. Richardson - Pittsburgh PA, US
Sergey M. Shevchenko - Aurora IL, US

International Classification:

D21H 21/02
D21H 17/53

US Classification:

1621641

Abstract:

Described herein are methods of reducing the deposition of organic contaminants, such as pitch and stickies, in papermaking processes.

US Patent:

6375829, Apr 23, 2002

Filed:

Mar 7, 2000

Appl. No.:

09/519688

Inventors:

Sergey M. Shevchenko - Lisle IL
Dmitri L. Kouznetsov - Naperville IL
Prasad Y. Duggirala - Naperville IL

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

G01N 2742

US Classification:

2057935, 205794, 204434, 73 6162, 73 6175

Abstract:

This invention is directed to a method and apparatus for measuring the rate of calcium oxalate scale formation in a continuously flowing solution having a pH of from about 2 to about 3 comprising measuring the rate of deposition of calcium oxalate scale from the solution on to a quartz crystal microbalance having a top side comprising a working electrode in contact with the solution and a second, bottom side isolated from the solution, wherein the pH of the solution proximate to the microbalance is measured using a pH measuring module and is controlled electrochemically at from about 3. 5 to about 9 and wherein the working electrode is coated with or made of a conductive material on which the intensive evolution of hydrogen gas proceeds at potentials more negative than those necessary to achieve a pH of 3. 5-9 proximate to the microbalance.