Patents by Inventor Nanping Xu
Nanping Xu 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: 11390565Abstract: The Invention relates to a method for preparing a multichannel hollow fiber membrane. According to a certain ratio, ceramic powder, a macromolecular polymer, an organic solvent, and a dispersant are mixed evenly to prepare a membrane casting solution; and after bubble removing processing is performed on the membrane casting solution, a membrane green body is formed with the cooperation of a multichannel hollow fiber die and phase inversion. After the membrane green body is roasted at a high temperature, a multichannel ceramic hollow fiber membrane is formed. The multichannel ceramic hollow fiber membrane has an asymmetric structure and a skeleton structure in an inner cavity and can meet the strength and flux requirements of a ceramic hollow fiber membrane.Type: GrantFiled: May 9, 2014Date of Patent: July 19, 2022Assignee: NANJING UNIVERSITY OF TECHNOLOGYInventors: Xuehong Gu, Zhenzhou Shi, Yuanyuan Chen, Chun Zhang, Nanping Xu
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Patent number: 10927229Abstract: The present invention relates to a method for preparing nanoporous polysulfone-based polymers, including: a copolymer of a polysulfone polymer and a polar polymer is immersed into a compound swelling agent, and maintained for at least 1 minute above room temperature; the compound swelling agent is a “solvent pair” composed of the mixture of solvent A and solvent B; the solvent A has high affinity with the polysulfone polymer; and the solvent B has high affinity with the polar polymer; the treated copolymer is taken out from the compound swelling agent and then dried to remove the solvent to obtain the nanoporous polysulfone-based polymers.Type: GrantFiled: June 30, 2017Date of Patent: February 23, 2021Assignee: NANJING TECH UNIVERSITYInventors: Yong Wang, Weihong Xing, Nanping Xu
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Patent number: 10875783Abstract: The present invention relaters to a method for continuously preparing a nano zinc oxide with a membrane reactor. A zinc salt solution and a precipitator solution required for the preparation of a zinc oxide are respectively used as dispersion phases, and under the action of a certain pressure, the two reaction solutions respectively penetrate through a membrane tube at a certain rate and disperse quickly under the action of a shear force and react, producing a precursor precipitate. A precursor suspension penetrates through the membrane tube continuously and circularly after being pressurized by a pump, and at the same time, deionized water as a washing fluid is added to a suspension storage tank, wherein impurity ions penetrate through membrane pores and are discharged along with the liquid medium; after the concentration of the impurity ions meets requirements, the concentrated solution is discharged continuously and then spray-dried to obtain a basic zinc carbonate precursor powder.Type: GrantFiled: September 12, 2014Date of Patent: December 29, 2020Assignee: NANJING UNIVERSITY OF TECHNOLOGYInventors: Weihong Xing, Zhilong Xu, Nanping Xu, Zhaoxiang Zhong, Feng Zhang
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Publication number: 20190211175Abstract: The present invention relates to a method for preparing nanoporous polysulfone-based polymers, including: a copolymer of a polysulfone polymer and a polar polymer is immersed into a compound swelling agent, and maintained for at least 1 minute above room temperature; the compound swelling agent is a “solvent pair” composed of the mixture of solvent A and solvent B; the solvent A has high affinity with the polysulfone polymer; and the solvent B has high affinity with the polar polymer; the treated copolymer is taken out from the compound swelling agent and then dried to remove the solvent to obtain the nanoporous polysulfone-based polymers.Type: ApplicationFiled: June 30, 2017Publication date: July 11, 2019Applicant: NANJING TECH UNIVERSITYInventors: Yong WANG, Weihong XING, Nanping XU
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Patent number: 10287214Abstract: A preparation method of a SiC porous ceramic material and porous ceramic material manufactured by using the method, comprising: mixing a SiC aggregate, a sintering aid (zirconium oxide), a pore-forming agent (activated carbon) and a polymer binder with a reinforcing agent (SiC whiskers) according to a certain proportion, and obtaining a porous ceramic material via forming, drying and high-temperature sintering. The porous ceramic material has a high strength, a high porosity, a good thermal shock resistance and a low sintering temperature, and can server as a filter material of high-temperature flue gas and a carrier material in vehicle exhaust purification.Type: GrantFiled: September 9, 2014Date of Patent: May 14, 2019Assignee: NANJING TECH UNIVERSITYInventors: Weihong Xing, Zhaoxiang Zhong, Feng Han, Feng Zhang, Nanping Xu
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Patent number: 10252985Abstract: The invention relates to a solvent-free green ammoximation process based on membrane distribution with a procedure as: adding TS-1 catalyst and ketone into a reactor in advance; setting the stirring speed and reaction temperature; after reaching the set temperature, adding a certain amount of ammonia and hydrogen peroxide into a reaction solution, wherein the hydrogen peroxide is fed in a way of using membrane as a distributor, the ammonia is fed in a continuous or semi-continuous manner; oxime is produced upon the reaction. The advantages of the invention include the mild reaction conditions, high reacting efficiency, simple operation and environmentally-friendly process. And there is no need to add any solvent during the reaction process. During the ammoximation reaction, both the conversion rate of the ketone and the selectivity of the oxime can be over 98.0%.Type: GrantFiled: July 31, 2015Date of Patent: April 9, 2019Assignee: Nanjing University of TechnologyInventors: Weihong Xing, Honglin Mao, Rizhi Chen, Hongnian Shang, Nanping Xu
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Publication number: 20190040003Abstract: The invention relates to a solvent-free green ammoximation process based on membrane distribution with a procedure as: adding TS-1 catalyst and ketone into a reactor in advance; setting the stirring speed and reaction temperature; after reaching the set temperature, adding a certain amount of ammonia and hydrogen peroxide into a reaction solution, wherein the hydrogen peroxide is fed in a way of using membrane as a distributor, the ammonia is fed in a continuous or semi-continuous manner; oxime is produced upon the reaction. The advantages of the invention include the mild reaction conditions, high reacting efficiency, simple operation and environmentally-friendly process. And there is no need to add any solvent during the reaction process. During the ammoximation reaction, both the conversion rate of the ketone and the selectivity of the oxime can be over 98.0%.Type: ApplicationFiled: July 31, 2015Publication date: February 7, 2019Applicant: Nanjing University of TechnologyInventors: Weihong XING, Honglin MAO, Rizhi CHEN, Hongnian SHANG, Nanping XU
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Publication number: 20170283329Abstract: A preparation method of a SiC porous ceramic material and porous ceramic material manufactured by using the method, comprising: mixing a SiC aggregate, a sintering aid (zirconium oxide), a pore-forming agent (activated carbon) and a polymer binder with a reinforcing agent (SiC whiskers) according to a certain proportion, and obtaining a porous ceramic material via forming, drying and high-temperature sintering. The porous ceramic material has a high strength, a high porosity, a good thermal shock resistance and a low sintering temperature, and can server as a filter material of high-temperature flue gas and a carrier material in vehicle exhaust purification.Type: ApplicationFiled: September 9, 2014Publication date: October 5, 2017Inventors: Weihong Xing, Zhaoxiang Zhong, Feng HAN, Feng ZHANG, Nanping XU
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Publication number: 20170044021Abstract: The present invention relaters to a method for continuously preparing a nano zinc oxide with a membrane reactor. A zinc salt solution and a precipitator solution required for the preparation of a zinc oxide are respectively used as dispersion phases, and under the action of a certain pressure, the two reaction solutions respectively penetrate through a membrane tube at a certain rate and disperse quickly under the action of a shear force and react, producing a precursor precipitate. A precursor suspension penetrates through the membrane tube continuously and circularly after being pressurized by a pump, and at the same time, deionized water as a washing fluid is added to a suspension storage tank, wherein impurity ions penetrate through membrane pores and are discharged along with the liquid medium; after the concentration of the impurity ions meets requirements, the concentrated solution is discharged continuously and then spray-dried to obtain a basic zinc carbonate precursor powder.Type: ApplicationFiled: September 12, 2014Publication date: February 16, 2017Inventors: Weihong XING, Zhilong XU, Nanping XU, Zhaoxiang ZHONG, Feng ZHANG
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Publication number: 20160137557Abstract: The Invention relates to a method for preparing a multichannel hollow fiber membrane. According to a certain ratio, ceramic powder, a macromolecular polymer, an organic solvent, and a dispersant are mixed evenly to prepare a membrane casting solution; and after bubble removing processing is performed on the membrane casting solution, a membrane green body is formed with the cooperation of a multichannel hollow fiber die and phase inversion. After the membrane green body is roasted at a high temperature, a multichannel ceramic hollow fiber membrane is formed. The multichannel ceramic hollow fiber membrane has an asymmetric structure and a skeleton structure in an inner cavity and can meet the strength and flux requirements of a ceramic hollow fiber membrane.Type: ApplicationFiled: May 9, 2014Publication date: May 19, 2016Applicant: NANJING UNIVERSITY OF TECHNOLOGYInventors: Xuehong GU, Zhenzhou SHI, Yuanyuan CHEN, Chun ZHANG, Nanping XU
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Patent number: 8809420Abstract: A method for preparing organic-inorganic composite materials is provided. It is a dispersion method that the inorganic phase is introduced into the polymer matrix uniformly. The core-shell structure, in which the inorganic materials are core and the organic materials are shell, is formed by first wrapping the inorganic materials with the organic materials in the same reactor. Therefore, the match between the polarity of inorganic phase and the polarity of polymer phase is increased.Type: GrantFiled: February 8, 2010Date of Patent: August 19, 2014Assignee: Nanjing University of TechnologyInventors: Wang Wei, Gongping Liu, Nanping Xu, Wanqin Jin
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Patent number: 8545685Abstract: Provided is a cleaning process of producing lactic acid. Firstly saccharification liquid is prepared through saccharated materials, then fermented with nutritive materials and lactic acid bacteria, and liquid alkali is used to adjust the pH. The fermentation broth is filtrated with porous membrane, and the lactic acid bacteria in the interception liquid are then reintroduced into the porous membrane for recycling. The permeate from porous membrane is subjected to nanofiltration to be decolored and purified. The concentrated solution from nanofiltration and the cleaning liquid from fermentation tank and its affiliated equipment are filtrated and sterilized by using ceramic membrane, and then are reintroduced into the fermentation unit for recycling. The permeate from nanofiltration is then subjected to bipolar electrodialysis system to prepare lactic acid, and the liquid alkali produced at the same time is reintroduced into the fermentation tank for recycling.Type: GrantFiled: April 20, 2009Date of Patent: October 1, 2013Assignee: Nanjing University of TechnologyInventors: Nanping Xu, Weixing Li, Weihong Xing, Yiqun Fan
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Patent number: 8486171Abstract: Dry dust removal method in organic chlorosilane production is provided, in which the detailed steps are as follows: delivering high-temperature flue gas (a) from fluidized bed reactor (I) into inorganic film cross-flow filter (E) to remove dust for the first time; delivering the concentrated dust gas (c) trapped by inorganic film cross-flow filter (II) into bag filter (III) to remove dust for the second time; returning the gas mixture (f) of passing through bag filter (EI) to the air intake of inorganic film cross-flow filter (II); condensing the residual clean gas (b) from the osmotic side of inorganic film in condenser (A), and then rectifying in rectifying column (B) to separate the products of chloromethane (g) and methyl chlorosilane (h) to obtain the product of methyl chlorosilane (h); returning chloromethane to fluidized bed reactor to take part in reaction; retreating the dust (e) trapped by inorganic film cross-flow filter and bag filter, and then returning it to fluidized bed reactor (I) to take parType: GrantFiled: February 4, 2010Date of Patent: July 16, 2013Assignees: Nanjing University of Technology, Nanjing Jiusi High-Tech Co., Ltd.Inventors: Weihong Xing, Zhaoxiang Zhong, Nanping Xu
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Publication number: 20120302682Abstract: A method for preparing organic-inorganic composite materials is provided. It is a dispersion method that the inorganic phase is introduced into the polymer matrix uniformly. The core-shell structure, in which the inorganic materials are core and the organic materials are shell, is formed by first wrapping the inorganic materials with the organic materials in the same reactor. Therefore, the match between the polarity of inorganic phase and the polarity of polymer phase is increased.Type: ApplicationFiled: February 8, 2010Publication date: November 29, 2012Applicant: NANJING UNIVERSITY OF TECHNOLOGYInventors: Wang Wei, Gongping Liu, Nanping Xu, Wanqin Jin
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Publication number: 20120285194Abstract: Dry dust removal method in organic chlorosilane production is provided, in which the detailed steps are as follows: delivering high-temperature flue gas (a) from fluidized bed reactor (I) into inorganic film cross-flow filter (E) to remove dust for the first time; delivering the concentrated dust gas (c) trapped by inorganic film cross-flow filter (II) into bag filter (III) to remove dust for the second time; returning the gas mixture (f) of passing through bag filter (EI) to the air intake of inorganic film cross-flow filter (II); condensing the residual clean gas (b) from the osmotic side of inorganic film in condenser (A), and then rectifying in rectifying column (B) to separate the products of chloromethane (g) and methyl chlorosilane (h) to obtain the product of methyl chlorosilane (h); returning chloromethane to fluidized bed reactor to take part in reaction; retreating the dust (e) trapped by inorganic film cross-flow filter and bag filter, and then returning it to fluidized bed reactor (I) to take parType: ApplicationFiled: February 4, 2010Publication date: November 15, 2012Applicants: NANJING JIUSI HIGH-TECH CO., LTD., NANJING UNIVERSITY OF TECHNOLOGYInventors: Weihong Xing, Zhaoxiang Zhong, Nanping Xu
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Publication number: 20110210001Abstract: Provided is a cleaning process of producing lactic acid. Firstly saccharification liquid is prepared through saccharated materials, then fermented with nutritive materials and lactic acid bacteria, and liquid alkali is used to adjust the pH. The fermentation broth is filtrated with porous membrane, and the lactic acid bacteria in the interception liquid are then reintroduced into the porous membrane for recycling. The permeate from porous membrane is subjected to nanofiltration to be decoloured and purified. The concentrated solution from nanofiltration and the cleaning liquid from fermentation tank and its affiliated equipment are filtrated and sterilized by using ceramic membrane, and then are reintroduced into the fermentation unit for recycling. The permeate from nanofiltration is then subjected to bipolar electrodialysis system to prepare lactic acid, and the liquid alkali produced at the same time is reintroduced into the fermentation tank for recycling.Type: ApplicationFiled: April 20, 2009Publication date: September 1, 2011Applicant: NANJING UNIVERSITY OF TECHNOLOGYInventors: Nanping Xu, Weixing Li, Weihong Xing, Yiqun Fan