Patents by Inventor Haixuan Zou
Haixuan Zou 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: 8475627Abstract: A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. In one embodiment, the pre-extraction step involves contacting the lignocellulosic material with an aqueous solution under conditions that release acidic material from the lignocellulosic material into the aqueous solution, and the aqueous solution includes a basic material that at least partly neutralizes the acidic material so that the aqueous solution at the end of the pre-extraction step has a pH within a range of from 4.5 to 11. The process also includes a pulping step, after the pre-extraction step, in which the lignocellulosic material is separated into pulp. The process further includes an adsorption step, after the pulping step, in which hemicellulose is adsorbed on the pulp.Type: GrantFiled: May 16, 2011Date of Patent: July 2, 2013Assignees: University of Maine System Board of Trustees, International Paper CompanyInventors: Adriaan Reinhard Pieter van Heiningen, Sung-Hoon Yoon, Haixuan Zou, Jianer Jiang, Gopal C. Goyal
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Publication number: 20110214826Abstract: A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. In one embodiment, the pre-extraction step involves contacting the lignocellulosic material with an aqueous solution under conditions that release acidic material from the lignocellulosic material into the aqueous solution, and the aqueous solution includes a basic material that at least partly neutralizes the acidic material so that the aqueous solution at the end of the pre-extraction step has a pH within a range of from 4.5 to 11. The process also includes a pulping step, after the pre-extraction step, in which the lignocellulosic material is separated into pulp. The process further includes an adsorption step, after the pulping step, in which hemicellulose is adsorbed on the pulp.Type: ApplicationFiled: May 16, 2011Publication date: September 8, 2011Applicants: UNIVERSITY OF MAINE SYSTEM BOARD OF TRUSTEES, INTERNATIONAL PAPER COMPANYInventors: Adriaan Reinhard Pieter van Heiningen, Sung-Hoon Yoon, Haixuan Zou, Jianer Jiang, Gopal C. Goyal
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Patent number: 7943009Abstract: A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. In one embodiment, the pre-extraction step involves contacting the lignocellulosic material with an aqueous solution under conditions that release acidic material from the lignocellulosic material into the aqueous solution, and the aqueous solution includes a basic material that at least partly neutralizes the acidic material so that the aqueous solution at the end of the pre-extraction step has a pH within a range of from 4.5 to 11. The process also includes a pulping step, after the pre-extraction step, in which the lignocellulosic material is separated into pulp. The process further includes an adsorption step, after the pulping step, in which hemicellulose is adsorbed on the pulp.Type: GrantFiled: December 30, 2009Date of Patent: May 17, 2011Assignees: University of Maine System Board of Trustees, International Paper CompanyInventors: Adriaan Reinhard Pieter van Heiningen, Sung-Hoon Yoon, Haixuan Zou, Jianer Jiang, Gopal C. Goyal
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Patent number: 7842161Abstract: A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. Then, in a solvent pulping step, the lignocellulosic material is separated into pulp by contacting the lignocellulosic material with a cooking liquor comprising a solvent. In one embodiment, the solvent has a boiling point of at least about 150° C. In another embodiment, the cooking liquor comprises a mixture of solvent and water.Type: GrantFiled: December 26, 2007Date of Patent: November 30, 2010Assignees: The University of Maine System Board of Trustees, International PaperInventors: Adriaan Reinhard Pieter van Heiningen, Sung-Hoon Yoon, Haixuan Zou, Jianer Jiang, Gopal C. Goyal
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Patent number: 7824521Abstract: A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. In one embodiment, the pre-extraction step involves contacting the lignocellulosic material with an aqueous solution under conditions that release acidic material from the lignocellulosic material into the aqueous solution, and the aqueous solution includes a basic material that at least partly neutralizes the acidic material so that the aqueous solution at the end of the pre-extraction step has a pH within a range of from 4.5 to 11. The process also includes a pulping step, after the pre-extraction step, in which the lignocellulosic material is separated into pulp. The process further includes an adsorption step, after the pulping step, in which hemicellulose is adsorbed on the pulp.Type: GrantFiled: December 18, 2006Date of Patent: November 2, 2010Assignees: University of Maine System Board of Trustees, International Paper CompanyInventors: Adriaan Reinhard Pieter van Heiningen, Sung-Hoon Yoon, Haixuan Zou, Jianer Jiang, Gopal C. Goyal
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Publication number: 20100224336Abstract: A process of bleaching a wood pulp includes contacting the pulp with ozone to delignify the pulp in an ozone bleaching stage. A phosphonate chelant is added to the pulp so that the chelant is present with the pulp during the bleaching stage. The process excludes washing of the pulp to remove chelant between the chelant addition and the bleaching stage.Type: ApplicationFiled: April 28, 2010Publication date: September 9, 2010Applicant: UNIVERSITY OF MAINE SYSTEM BOARD OF TRUSTEESInventors: Dwane Scott Hutto, Haixuan Zou
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Publication number: 20100101742Abstract: A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. In one embodiment, the pre-extraction step involves contacting the lignocellulosic material with an aqueous solution under conditions that release acidic material from the lignocellulosic material into the aqueous solution, and the aqueous solution includes a basic material that at least partly neutralizes the acidic material so that the aqueous solution at the end of the pre-extraction step has a pH within a range of from 4.5 to 11. The process also includes a pulping step, after the pre-extraction step, in which the lignocellulosic material is separated into pulp. The process further includes an adsorption step, after the pulping step, in which hemicellulose is adsorbed on the pulp.Type: ApplicationFiled: December 30, 2009Publication date: April 29, 2010Applicants: University of Maine System Board Of Trustees, International Paper CompanyInventors: Adriaan Reinhard Pieter van Heiningen, Sung-Hoon Yoon, Haixuan Zou, Jianer Jiang, Gopal C. Goyal
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Publication number: 20080142176Abstract: A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. In one embodiment, the pre-extraction step involves contacting the lignocellulosic material with an aqueous solution under conditions that release acidic material from the lignocellulosic material into the aqueous solution, and the aqueous solution includes a basic material that at least partly neutralizes the acidic material so that the aqueous solution at the end of the pre-extraction step has a pH within a range of from 4.5 to 11. The process also includes a pulping step, after the pre-extraction step, in which the lignocellulosic material is separated into pulp. The process further includes an adsorption step, after the pulping step, in which hemicellulose is adsorbed on the pulp.Type: ApplicationFiled: December 18, 2006Publication date: June 19, 2008Inventors: Adriaan Reinhard Pieter van Heiningen, Sung-Hoon Yoon, Haixuan Zou, Jianer Jiang, Gopal C. Goyal
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Publication number: 20070131364Abstract: A process of treating a cellulose-lignin pulp. In an ozone stage, the pulp is contacted with ozone to bleach and delignify the pulp. The ozone stage is conducted without the addition of a peroxide bleaching agent. A chelant is introduced into the ozone stage to improve selectivity of the delignification.Type: ApplicationFiled: December 14, 2005Publication date: June 14, 2007Inventors: Dwane Hutto, Haixuan Zou