Patents by Inventor Sergey M. Shevchenko
Sergey M. Shevchenko has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10519602Abstract: An acrylamide-based polymer which contains one or more multiquaternized (“multiquat”) monomer unit(s) is provided. The acrylamide-based polymer can be used in a papermaking process to reduce pitch and stickies deposition, improve retention and drainage, and enhance dry strength properties of paper. Also included is a method of controlling pitch and stickies deposition in papermaking comprising treating pulp slurry with an acrylamide-based polymer which contains one or more multiquaternized (“multiquat”) monomer unit(s).Type: GrantFiled: June 14, 2018Date of Patent: December 31, 2019Assignee: Ecolab USA Inc.Inventors: Xiaojin Harry Li, Sergey M. Shevchenko, Ross Gray, Robert M. Lowe, David Jordan, Zhengang Zong
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Publication number: 20180363247Abstract: An acrylamide-based polymer which contains one or more multiquaternized (“multiquat”) monomer unit(s) is provided. The acrylamide-based polymer can be used in a papermaking process to reduce pitch and stickies deposition, improve retention and drainage, and enhance dry strength properties of paper. Also included is a method of controlling pitch and stickies deposition in papermaking comprising treating pulp slurry with an acrylamide-based polymer which contains one or more multiquaternized (“multiquat”) monomer unit(s).Type: ApplicationFiled: June 14, 2018Publication date: December 20, 2018Applicant: Ecolab USA Inc.Inventors: Xiaojin Harry Li, Sergey M. Shevchenko, Ross Gray, Robert M. Lowe, David Jordan, Zhengang Zong
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Patent number: 9932709Abstract: Compositions and methods that preserve and enhance the brightness of pulp, and also improve the color of pulp or paper, when applied during different stages of a papermaking process, are disclosed. The compositions and methods maintain or enhance brightness, prevent yellowing, and enhance the performance of paper products. The compositions can include a mixture of reducing agents and can also include optical brighteners, chelants, polycarboxylates, or other additives. The mixture of reducing agents can include a borohydride, such as sodium borohydride, and any other reducing agent, such as a sulfite or bisulfite.Type: GrantFiled: March 15, 2013Date of Patent: April 3, 2018Assignee: ECOLAB USA INC.Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko
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Publication number: 20180030651Abstract: The present disclosure provides methods and compositions for improving the oxygen delignification process. The methods may include adding low doses of a borohydride stabilized in an alkaline solution to brownstock pulp. The methods may result in significant chemical savings, increased pulp brightness, increased pulp yield, and reduced kappa number.Type: ApplicationFiled: July 20, 2017Publication date: February 1, 2018Applicant: ECOLAB USA, Inc.Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko
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Publication number: 20170268171Abstract: Bleaching methods and formulations for bleaching/delignification processes for chemical pulp are provided. The bleaching methods utilize peroxide and an organomanganese complex under aqueous caustic conditions, increasing bleaching efficiency of the overall bleaching/delignification process. Chemical pulp having increased brightness can be obtained at decreased temperatures and with reduced stage time, resulting in reduced chemical consumption and improved energy efficiency.Type: ApplicationFiled: March 15, 2017Publication date: September 21, 2017Applicant: Ecolab USA Inc.Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko
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Patent number: 9562861Abstract: A challenge in using recycled material in the papermaking process is the presence of hydrophobic organics with adhesive properties commonly known as “stickies.” Hydrophobic agglomerates can result in spots or defects in the final paper product or deposit on papermaking equipment resulting in poor runnability and downtime. Technologies for monitoring and controlling microstickies exist. However, a need exists for a technique to rapidly determine the size and content of macrostickies (diameter>100 microns) in recycled pulp process streams. The present invention is a device and method to perform real-time macrostickies and/or any visible hydrophobic particle analysis in an aqueous medium. Using the present invention, furnish quality can be monitored and treatment performance can be monitored and controlled. The technique is based on fluorescence image analysis to identify and count sticky particles as well as measure their size.Type: GrantFiled: April 5, 2011Date of Patent: February 7, 2017Assignee: Nalco CompanyInventors: William A. Von Drasek, Brett Brotherson, Sergey M. Shevchenko, Michael J. Murcia
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Patent number: 9068293Abstract: The invention is directed towards methods and compositions for processes based on the combination of organic peroxyacids and ammonium salts that preserve and enhance the response to optical brighteners (fluorescent whitening dyes), brightness and improve color of pulp or paper when applied during different stages of the papermaking process are identified. The composition and method improve response to optical brighteners (fluorescent whitening dyes), maintain and/or enhance brightness and enhance the performance of paper products. Used in combination with optical brighteners the described agents produce a synergistic effect not previously identified in the paper process.Type: GrantFiled: March 27, 2013Date of Patent: June 30, 2015Assignee: NALCO COMPANYInventors: Prasad Y. Duggirala, Sergey M. Shevchenko
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Patent number: 9063080Abstract: The invention provides methods and compositions for measuring the formation of scale within a process system. The method involves measuring changes in the cell fouling as reflected on the refraction index measurements of a liquid medium with a refractometer and determining the scale formation from changes in the cell fouling factor. This allows for a refractometer to determine the formation of scale in locations that otherwise would not be measurable.Type: GrantFiled: July 26, 2013Date of Patent: June 23, 2015Assignee: ECOLAB USA INC.Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko, Michael J. Murcia
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Patent number: 8992688Abstract: The invention provides methods and compositions for the removal of lignin from water suspensions originating from lignocellulosic feedstocks. The method involves adding coagulants and flocculants to the suspension. While hydrolysis does remove some lignin, the pitch in many feedstocks prevents the hydrolysis from coming into contact with all of the lignin or so effectively blocks it that the lignin can re-condense. This is especially the case with low lignin grass based lignocellulosic feedstock. But with the addition of the inventive coagulants and flocculants, a phase separation substantially accelerates and lignin forms flocs that forms that physically separates the lignin from the pitch and the cellulose thereby makes removal the lignin from aqueous suspensions by decanting and filtration effective and easy.Type: GrantFiled: March 10, 2013Date of Patent: March 31, 2015Assignee: Ecolab USA Inc.Inventors: Sergey M. Shevchenko, Jane B. Wong Shing, Olivier Clot
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Publication number: 20150029496Abstract: The invention provides methods and compositions for measuring the formation of scale within a process system. The method involves measuring changes in the cell fouling as reflected on the refraction index measurements of a liquid medium with a refractometer and determining the scale formation from changes in the cell fouling factor. This allows for a refractometer to determine the formation of scale in locations that otherwise would not be measureable.Type: ApplicationFiled: July 26, 2013Publication date: January 29, 2015Applicant: Ecolab USA Inc.Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko, Michael J. Murcia
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Publication number: 20140318724Abstract: The invention provides methods and compositions for enhancing the digestion of pulp in a chemical pulping process. The method uses ultra-low, economically feasible dosages of BH applied right before the pulping process begins, in a stable alkaline solution fed into white liquor line, to improve the process by saving pulping chemicals, increasing pulp brightness and yield and reducing the kappa number.Type: ApplicationFiled: July 14, 2014Publication date: October 30, 2014Applicant: NALCO COMPANYInventors: Prasad Y. Duggirala, Sergey M. Shevchenko
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Publication number: 20140259458Abstract: Compositions and methods that preserve and enhance the brightness of pulp, and also improve the color of pulp or paper, when applied during different stages of a papermaking process, are disclosed. The compositions and methods maintain or enhance brightness, prevent yellowing, and enhance the performance of paper products. The compositions can include a mixture of reducing agents and can also include optical brighteners, chelants, polycarboxylates, or other additives. The mixture of reducing agents can include a borohydride, such as sodium borohydride, and any other reducing agent, such as a sulfite or bisulfite.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Applicant: Ecolab USA Inc.Inventors: Prasad Y. Duggirala, Sergey M. Shevchenko
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Publication number: 20140251318Abstract: The invention provides methods and compositions for the removal of lignin from water suspensions originating from lignocellulosic feedstocks. The method involves adding coagulants and flocculants to the suspension. While hydrolysis does remove some lignin, the pitch in many feedstocks prevents the hydrolysis from coming into contact with all of the lignin or so effectively blocks it that the lignin can re-condense. This is especially the case with low lignin grass based lignocellulosic feedstock. But wWith the addition of the inventive coagulants and flocculants, a phase separation substantially accelerates and lignin forms flocs that forms that physically separates the lignin from the pitch and the cellulose thereby makes removal the lignin from aqueous suspensions by decanting and filtration effective and easy.Type: ApplicationFiled: March 10, 2013Publication date: September 11, 2014Applicant: Ecolab USA Inc.Inventors: Sergey M. Shevchenko, Jane B. Wong Shing, Olivier Clot
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Patent number: 8728275Abstract: Described herein are methods of reducing the deposition of organic contaminants, such as pitch and stickies, in papermaking processes.Type: GrantFiled: July 27, 2012Date of Patent: May 20, 2014Assignee: Ecolab USA Inc.Inventors: Xiaojin Harry Li, Paul F. Richardson, Sergey M. Shevchenko
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Publication number: 20140027079Abstract: Described herein are methods of reducing the deposition of organic contaminants, such as pitch and stickies, in papermaking processes.Type: ApplicationFiled: July 27, 2012Publication date: January 30, 2014Inventors: Xiaojin Harry Li, Paul F. Richardson, Sergey M. Shevchenko
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Patent number: 8500957Abstract: A method for monitoring with enhanced sensitivity of the deposition of one or more organic materials dispersed in an aqueous medium in a papermaking process which includes measuring the rate of deposition of the organic materials from the aqueous medium onto a quartz crystal microbalance having a top side contacting with the aqueous medium coated with a layer containing a material with surface energy in the range from about 34 to about 49 dynes/cm2, 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.Type: GrantFiled: October 19, 2010Date of Patent: August 6, 2013Assignee: Nalco CompanyInventors: Sergey M. Shevchenko, Michael J. Murcia
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Patent number: 8303768Abstract: A method of monitoring and inhibiting scale precipitation and deposition from spent liquor in pulp mill evaporators and concentrators is disclosed. The method includes connecting a black liquor deposition monitor to a pulp mill evaporator or concentrator and measuring the thermal conductivity on the outer surface of the monitor. A controller interprets the measured thermal conductivity and determines a level of scale deposition. If the level of scale deposition is above a predetermined level, the controller is operable to introduce a scale-inhibiting composition to the spent liquor. The scale-inhibiting composition may include organic polycarboxylic acids; organic fatty acids; low molecular weight and polymeric aromatic acids; organic acid esters, anhydrides, and amides; low molecular weight and polymeric aliphatic and aromatic sulfonic acids; and low molecular weight and polymeric amines; and any combinations.Type: GrantFiled: July 25, 2011Date of Patent: November 6, 2012Assignee: Nalco CompanyInventors: Sergey M. Shevchenko, Prasad Y. Duggirata, Dmitri L. Kouznetsov
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Publication number: 20120258547Abstract: A challenge in using recycled material in the papermaking process is the presence of hydrophobic organics with adhesive properties commonly known as “stickies.” Hydrophobic agglomerates can result in spots or defects in the final paper product or deposit on papermaking equipment resulting in poor runnability and downtime. Technologies for monitoring and controlling microstickies exist. However, a need exists for a technique to rapidly determine the size and content of macrostickies (diameter>100 microns) in recycled pulp process streams. The present invention is a device and method to perform real-time macrostickies and/or any visible hydrophobic particle analysis in an aqueous medium. Using the present invention, furnish quality can be monitored and treatment performance can be monitored and controlled. The technique is based on fluorescence image analysis to identify and count sticky particles as well as measure their size.Type: ApplicationFiled: April 5, 2011Publication date: October 11, 2012Inventors: William A. Von Drasek, Brett Brotherson, Sergey M. Shevchenko, Michael J. Murcia
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Patent number: 8262858Abstract: 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.Type: GrantFiled: March 29, 2011Date of Patent: September 11, 2012Assignee: Nalco CompanyInventors: Prasad Y. Duggirala, Sergey M. Shevchenko, Katherine M. Broadus
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Patent number: 8262852Abstract: This invention provides a composition and method for improving a mechanical pulping process by decreasing freeness and amount of shives, providing energy and chemical savings, and enhancing brightness and mechanical strength of a paper product made from a pulp material in the process. The composition includes formulations, such as surfactants, chelants, hydrotropes, reductive and oxidative pulp modifiers, and pH-controlling chemicals. The method includes selectively introducing these formulations to the pulp material in the mechanical pulping process.Type: GrantFiled: July 8, 2010Date of Patent: September 11, 2012Assignee: Nalco CompanyInventors: Prasad Y. Duggirala, Sergey M. Shevchenko