Sergey M 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:

6527914, Mar 4, 2003

Filed:

Jan 30, 2002

Appl. No.:

10/066271

Inventors:

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

Assignee:

Ondeo Nalco Company - Naperville IL

International Classification:

D21H 2138

US Classification:

162142, 162150, 162162, 162158, 162160, 1621646

Abstract:

Methods to enhance the brightness and brightness stability of paper and paperboard made with Mechanical Pulp are described and claimed. The method involves applying a Penetrant Compound to paper or paperboard in an amount from about 0. 001 percent to about 1 percent by weight. The Penetrant Compound can have one component that is either polyamino polyether methylene phosphonate (PAPEMP) and -glucoheptonic--lactone (GL); or the Penetrant Compound can have two components, where the first component is selected from the group consisting of PAPEMP and GL and the second component is an inorganic salt; or the Penetrant Compound can have three components where one component is selected from the group consisting of PAPEMP and GL, the second component is selected from the group consisting of 3,5-dimethylperhydrothiadiazine-2-thion and dialkyldithiocarbamates and the third component is an inorganic salt.

US Patent:

6702921, Mar 9, 2004

Filed:

May 1, 2001

Appl. No.:

09/846635

Inventors:

Prasad Y. Duggirala - Naperville IL
Sergey M. Shevchenko - Aurora IL
Kristine S. Salmen - Naperville IL

Assignee:

Ondeo Nalco Company - Naperville IL

International Classification:

D21C 324

US Classification:

162 70, 162 71, 162 72, 162 76

Abstract:

A method to enhance brightness in Chemical and Mechanical bleached pulps comprising adding an organic sulfide chelant to the Chemical and Mechanical pulp.

US Patent:

6942782, Sep 13, 2005

Filed:

Apr 22, 2002

Appl. No.:

10/127380

Inventors:

Sergey M. Shevchenko - Aurora IL, US
Dmitri L. Kouznetsov - Aurora IL, US
Prasad Y. Duggirala - Naperville IL, US

Assignee:

Nalco Company - Naperville IL

International Classification:

G01N027/42

US Classification:

2057935, 204434, 205794, 73 6162, 73 6175

Abstract:

A method and apparatus for measuring the deposit forming propensity of a continuously flowing fluid having a bulk pH of about 1 to about 12 comprising measuring the rate at which deposit forms on a quartz crystal microbalance having a top side comprising a working electrode in contact with the fluid and a bottom side isolated from the fluid, wherein the pH of the fluid proximate to the microbalance is controlled electrochemically at about 1 to about 14 by applying to the working electrode a cathodic current of about −0. 001 to about −100 mA/cmor an anodic current of from about 0. 001 to about 100 mA/cmand wherein the working electrode is coated with or made of a conductive material on which the rate of hydrogen gas evolution is at least 10 times lower than on a gold cathode in acidic solution.

US Patent:

7229525, Jun 12, 2007

Filed:

May 3, 2005

Appl. No.:

11/121217

Inventors:

Prasad Y. Duggirala - Naperville IL, US
Sergey M. Shevchenko - Aurora IL, US
Kristine S. Salmen - Naperville IL, US

Assignee:

Nalco Company - Naperville IL

International Classification:

D21B 1/16

US Classification:

162 24, 162 17, 162 25, 162 82

Abstract:

A method to enhance brightness in Chemical and Mechanical pulps comprising adding an organic sulfide chelant is described and claimed. A method to enhance delignification in a Chemical pulp comprising adding an organic sulfide chelant is also described and claimed.

US Patent:

7351764, Apr 1, 2008

Filed:

Mar 31, 2004

Appl. No.:

10/814969

Inventors:

Sergey M. Shevchenko - Aurora IL, US
Prasad Y. Duggirala - Naperville IL, US

Assignee:

Nalco Company - Naperville IL

International Classification:

C09K 15/32
C09K 3/10
C01B 15/02
D21C 9/12
D06L 3/02

US Classification:

524556, 25218629, 25218641, 25238922, 25240022, 423272, 423273, 162 76, 162 79

Abstract:

Mechanical or Chemical pulp is treated with about 0. 01 weight % to about 5 weight % of a Mixture. The Mixture is water; diethylenetriaminepentakis(methyl)phosphonic acid or its known salts; polyacrylic acid or its known salts; and optionally one or more inert compounds. This Mixture acts to either maintain the brightness level of the pulp at the target level or to increase the brightness level of the pulp. In addition the Mixture allows for maintaining the pulp at the target level of brightness even when the amounts of other ingredients, such as hydrogen peroxide, hydrosulfite, sodium silicate and magnesium, that are typically added to the pulp, are reduced.

US Patent:

7842165, Nov 30, 2010

Filed:

Aug 29, 2007

Appl. No.:

11/846920

Inventors:

Sergey M. Shevchenko - Aurora IL, US
Michael J. Murcia - Aurora IL, US
Rodney H. Banks - Aurora IL, US

Assignee:

Nalco Company - Naperville IL

International Classification:

D21H 23/08

US Classification:

162198, 162263

Abstract:

A method for monitoring the deposition of one or more organic materials dispersed in an aqueous medium in a papermaking process comprising: measuring the rate of deposition of the organic materials from the aqueous medium on-to a quartz crystal microbalance having a top side contacting with the aqueous medium coated with a layer containing a non-swelling epoxy resin or a silicone containing polymer, and a second, bottom side isolated from the aqueous medium is disclosed. Additionally, a method for measuring the effectiveness of an inhibitor that decreases the deposition of the organic materials in a papermaking process is also disclosed.

US Patent:

7914646, Mar 29, 2011

Filed:

Jul 21, 2006

Appl. No.:

11/490738

Inventors:

Prasad Y. Duggirala - Naperville IL, US
Sergey M. Shevchenko - Aurora IL, US
Katherine M. Broadus - Aurora IL, US

Assignee:

Nalco Company - Naperville IL

International Classification:

D21F 11/00
D21C 9/10

US Classification:

162158, 162 70, 162162, 8119, 8648

Abstract:

Oxidative compositions and processes that preserve and enhance the brightness and improve color of pulp or paper when applied during different stages of the papermaking process are identified. The oxidative composition and method maintains and/or enhances brightness, prevents yellowing, and enhances the performance of paper products. Used in combination with optical brighteners and/or chelants the oxidative agents produce a synergistic effect not previously identified in the paper process.