Patents by Inventor Chungu Xia
Chungu Xia 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: 9168503Abstract: The invention relates to a reaction system and process for continuously preparing polymethoxy dimethyl ether (DMM3-8) by a continuous acetalization reaction between an aqueous formaldehyde solution or paraformaldehyde and methanol in the presence of a functionalized acidic ionic liquid as a catalyst. The reaction system of the invention preferably comprises a formaldehyde-concentrating unit, a vacuum-drying unit, an acetalization reaction unit, a product-separating unit and a catalyst-regenerating unit. The process of the invention uses aqueous formaldehyde solution as an initial raw material, which is concentrated in the formaldehyde-concentrating unit to a concentrated formaldehyde of 50˜80 wt. %, and vacuum-dried to paraformaldehyde, or uses paraformaldehyde as raw material directly, then obtains DMM3-8 by an acetalization reaction.Type: GrantFiled: March 18, 2014Date of Patent: October 27, 2015Assignees: Suzhou OST Advanced Materials Co., Ltd., Lanzhou Institute of Chemical Physics, Chinese Academy Of SciencesInventors: Jing Chen, Heyuan Song, Chungu Xia, Meirong Kang
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Patent number: 9169186Abstract: A system and method for producing polyoxymethylene dimethyl ethers (DMMn) using an aqueous formaldehyde solution as the initial reaction material. The process system has a polymerization reaction unit, an acetalation unit, a product separation unit, and a catalyst regeneration unit. Both polymerization and acetalation reaction are conducted in the presence of an ionic liquid as a catalyst, which can achieve the effect that two different reactions may be catalyzed by the same ionic liquid. The present invention employs a simple catalyst system, and achieves the efficient separation of the catalyst, the byproduct water, the product and the reaction materials in a separation manner combining the extraction and the rectification.Type: GrantFiled: December 20, 2012Date of Patent: October 27, 2015Assignee: Lanzhou Institute of Chemicals Physics, Chinese Academy of SciencesInventors: Chungu Xia, Heyuan Song, Jing Chen, Fuxiang Jin, Meirong Kang
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Patent number: 9067188Abstract: A reaction system and method for producing polyoxymethylene dialkyl ethers (RO(CH2O)nR, n=1-8) by continuous acetalation of formaldehyde and aliphatic alcohol in the presence of an acid ionic liquid catalyst. The reaction system includes an acetalation reaction unit, a product separation unit, and a catalyst regeneration unit. The recyclable material and catalyst are separated by combining extraction and rectification, and a recovery rate of more than 99% for the catalyst is achieved. Water, as the byproduct, is separated from the reaction system by destroying the azeotrope of water, alcohol, aldehyde, and RO(CH2O)nR, so that the product separation and catalyst regeneration are facilitated and the catalytic cycle is achieved.Type: GrantFiled: December 20, 2012Date of Patent: June 30, 2015Assignee: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Jing Chen, Heyuan Song, Chungu Xia, Meirong Kang, Ronghua Jin
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Publication number: 20150094497Abstract: The invention relates to a reaction system and process for continuously preparing polymethoxy dimethyl ether (DMM3-8) by a continuous acetalization reaction between an aqueous formaldehyde solution or paraformaldehyde and methanol in the presence of a functionalized acidic ionic liquid as a catalyst. The reaction system of the invention preferably comprises a formaldehyde-concentrating unit, a vacuum-drying unit, an acetalization reaction unit, a product-separating unit and a catalyst-regenerating unit. The process of the invention uses aqueous formaldehyde solution as an initial raw material, which is concentrated in the formaldehyde-concentrating unit to a concentrated formaldehyde of 50˜80 wt. %, and vacuum-dried to paraformaldehyde, or uses paraformaldehyde as raw material directly, then obtains DMM3-8 by an acetalization reaction.Type: ApplicationFiled: March 18, 2014Publication date: April 2, 2015Applicants: Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Suzhou OST Advanced Materials Co., Ltd.Inventors: Jing Chen, Heyuan Song, Chungu Xia, Meirong Kang
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Patent number: 8987521Abstract: It is disclosed a method for preparing polyoxymethylene dimethyl ethers by continuous polymerization and acetalation reactions. The method may include two steps: performing a polymerization reaction of an aqueous formaldehyde solution under catalysis of an ionic liquid IL I to obtain a mixed aqueous solution of trioxymethylene and formaldehyde; and an acetalation reaction of the mixed aqueous solution of trioxymethylene and formaldehyde with methanol is performed under catalysis of an ionic liquid IL II to prepare polyoxymethylene dimethyl ethers. The method may use an aqueous formaldehyde solution as a starting material to prepare polyoxymethylene dimethyl ethers by continuous polymerization and acetalation reactions, achieving a high use ratio of formaldehyde. A film evaporator is used in the invention, realizing a rapid separation and recycling of the light components, with a high separation efficiency. The separation of the catalyst is simple, thereby realizing recycling of the catalyst.Type: GrantFiled: June 20, 2011Date of Patent: March 24, 2015Assignee: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Chungu Xia, Heyuan Song, Jing Chen, Zhen Li
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Patent number: 8921591Abstract: A production process for substituted phenylacetic acids or ester analogs thereof is disclosed. In this process toluene or toluene substituted with various substituents, an alcohol, an oxidant and carbon monoxide are used as raw materials to obtain compounds comprising structure of phenylacetic acid ester or analogs thereof by catalysis of the complex catalyst formed from transition metal and ligand, and such compounds are hydrolyzed to obtain various substituted phenylacetic acid based compounds. This type of compounds and their derivatives serve as important fine chemicals used widely in the industries of pharmaceuticals, pesticides, perfume and the like.Type: GrantFiled: December 20, 2012Date of Patent: December 30, 2014Assignee: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Hanmin Huang, Chungu Xia, Pan Xie
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Patent number: 8816131Abstract: It is related to a method for preparing polyoxymethylene dimethyl ethers by a continuous acetalation reaction of trioxymethylene and methanol or methylal catalyzed by an ionic liquid. The processing apparatus used in the method includes a reaction zone, a separation zone, a catalyst regeneration zone and a product dehydration zone. A manner of circulating tubular reaction is used, resulting in a high external heat exchange efficiency, a simple structure of design and a low investment. A film evaporator is used, realizing a rapid separation and recycling of the light component, with a high separation efficiency. The separation of the catalyst solution from the crude product is simple, thereby realizing the regeneration and recycling of the catalyst.Type: GrantFiled: June 6, 2011Date of Patent: August 26, 2014Assignee: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Jing Chen, Heyuan Song, Chungu Xia, Zhen Li
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Publication number: 20140114092Abstract: A system and method for producing polyoxymethylene dimethyl ethers (DMMn) using an aqueous formaldehyde solution as the initial reaction material. The process system has a polymerization reaction unit, an acetalation unit, a product separation unit, and a catalyst regeneration unit. Both polymerization and acetalation reaction are conducted in the presence of an ionic liquid as a catalyst, which can achieve the effect that two different reactions may be catalyzed by the same ionic liquid. The present invention employs a simple catalyst system, and achieves the efficient separation of the catalyst, the byproduct water, the product and the reaction materials in a separation manner combining the extraction and the rectification.Type: ApplicationFiled: December 20, 2012Publication date: April 24, 2014Applicant: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Chungu XIA, Heyuan Song, Jing Chen, Fuxiang Jin, Meirong Kang
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Patent number: 8344183Abstract: The present invention discloses a method for synthesizing polyoxymethylene dimethyl ethers by ionic liquid catalysis. The method comprises synthesizing polyoxymethylene dimethyl ethers by using a functional acidic ionic liquid as catalyst and using methylal and trioxymethylene as reactant under a relative mild reaction condition. The invention has advantages of high catalyst activity and reaction conversion, simple reaction process, high operationability and controllability, as well as good product distribution and high raw material utilization ratio.Type: GrantFiled: August 27, 2009Date of Patent: January 1, 2013Assignee: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Jing Chen, Heyuan Song, Chungu Xia, Xinzhi Zhang, Zhonghua Tang
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Publication number: 20110313202Abstract: It is disclosed a method for preparing polyoxymethylene dimethyl ethers by continuous polymerization and acetalation reactions. The method may include two steps: performing a polymerization reaction of an aqueous formaldehyde solution under catalysis of an ionic liquid IL I to obtain a mixed aqueous solution of trioxymethylene and formaldehyde; and an acetalation reaction of the mixed aqueous solution of trioxymethylene and formaldehyde with methanol is performed under catalysis of an ionic liquid IL II to prepare polyoxymethylene dimethyl ethers. The method may use an aqueous formaldehyde solution as a starting material to prepare polyoxymethylene dimethyl ethers by continuous polymerization and acetalation reactions, achieving a high use ratio of formaldehyde. A film evaporator is used in the invention, realizing a rapid separation and recycling of the light components, with a high separation efficiency. The separation of the catalyst is simple, thereby realizing recycling of the catalyst.Type: ApplicationFiled: June 20, 2011Publication date: December 22, 2011Applicant: LANZHOU INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCESInventors: Chungu Xia, Heyuan Song, Jing Chen, Zhen Li
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Publication number: 20110288343Abstract: It is related to a method for preparing polyoxymethylene dimethyl ethers by a continuous acetalation reaction of trioxymethylene and methanol or methylal catalyzed by an ionic liquid. The processing apparatus used in the method includes a reaction zone, a separation zone, a catalyst regeneration zone and a product dehydration zone. A manner of circulating tubular reaction is used, resulting in a high external heat exchange efficiency, a simple structure of design and a low investment. A film evaporator is used, realizing a rapid separation and recycling of the light component, with a high separation efficiency. The separation of the catalyst solution from the crude product is simple, thereby realizing the regeneration and recycling of the catalyst.Type: ApplicationFiled: June 6, 2011Publication date: November 24, 2011Applicant: LANZHOU INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCESInventors: JING CHEN, HEYUAN SONG, CHUNGU XIA, ZHEN LI
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Publication number: 20100056830Abstract: The present invention discloses a method for synthesizing polyoxymethylene dimethyl ethers by ionic liquid catalysis. The method comprises synthesizing polyoxymethylene dimethyl ethers by using a functional acidic ionic liquid as catalyst and using methylal and trioxymethylene as reactant under a relative mild reaction condition. The invention has advantages of high catalyst activity and reaction conversion, simple reaction process, high operationability and controllability, as well as good product distribution and high raw material utilization ratio.Type: ApplicationFiled: August 27, 2009Publication date: March 4, 2010Applicant: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Jing CHEN, Heyuan SONG, Chungu XIA, Xinzhi ZHANG, Zhonghua TANG
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Patent number: 7598402Abstract: The present invention relates to a process for synthesizing trioxymethylene, wherein an aqueous solution of formaldehyde is used as the reactant; and an acidic ionic liquid in an amount of from 0.01 to 10 wt % is used as a catalyst.Type: GrantFiled: January 18, 2008Date of Patent: October 6, 2009Assignees: Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Blue Diamond International Co., Ltd.Inventors: Jing Chen, Heyuan Song, Chungu Xia, Zhonghua Tang, Xinzhi Zhang, Zhen Li, Enxiu Guo
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Patent number: 7586016Abstract: This invention disclosed a method for producing 1,2-propylene glycol from bio-based glycerol. In this method, a CuO—CeO2—SiO2 catalyst is filled into a fixed bed reactor, a glycerol solution is flowed into the reactor together with hydrogen gas in a manner of top feeding, and controlling the reaction temperature to be 170˜200° C., the reaction pressure to be 1.0˜5.0 MPa, so as to realize the production of 1,2-propylene glycol from the hydrogenation of glycerol. The catalyst used in this invention can sustain a high selectivity for the target product and a high conversion for glycerol for 500 hours.Type: GrantFiled: September 26, 2008Date of Patent: September 8, 2009Assignee: Lanzhou Institute of Chemical Physics, Chinese Academy of ScienceInventors: Fang Cui, Jing Chen, Chungu Xia, Haixiao Kang, Xinzhi Zhang, Jin Tong, Xuemei Li
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Patent number: 7560599Abstract: This invention describes a method for preparing polymethoxymethylal. By this method, polymethoxymethylal is prepared by a catalytic reaction using methanol and trioxymethylene as reactants and using an ionic liquid as catalyst under a relatively moderate reaction condition. The catalyst of this invention has a high catalytic activity and a high conversion; the reaction process is simple, easy to be operated and has a strong controllability; the distribution of the products after reaction is superior and the utilization ratio of the raw materials is high.Type: GrantFiled: July 28, 2008Date of Patent: July 14, 2009Assignee: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Jing Chen, Zhonghua Tang, Chungu Xia, Xinzhi Zhang, Zhen Li
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Publication number: 20090156866Abstract: This invention disclosed a method for producing 1,2-propylene glycol from bio-based glycerol. In this method, a CuO—CeO2—SiO2 catalyst is filled into a fixed bed reactor, a glycerol solution is flowed into the reactor together with hydrogen gas in a manner of top feeding, and controlling the reaction temperature to be 170˜200° C., the reaction pressure to be 1.0˜5.0 MPa, so as to realize the production of 1,2-propylene glycol from the hydrogenation of glycerol. The catalyst used in this invention can sustain a high selectivity for the target product and a high conversion for glycerol for 500 hours.Type: ApplicationFiled: September 26, 2008Publication date: June 18, 2009Applicant: LANZHOU INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCEInventors: Fang Cui, Jing Chen, Chungu Xia, Haixiao Kang, Xinzhi Zhang, Jin Tong, Xuemei Li
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Publication number: 20090036715Abstract: This invention describes a method for preparing polymethoxymethylal. By this method, polymethoxymethylal is prepared by a catalytic reaction using methanol and trioxymethylene as reactants and using an ionic liquid as catalyst under a relatively moderate reaction condition. The catalyst of this invention has a high catalytic activity and a high conversion; the reaction process is simple, easy to be operated and has a strong controllability; the distribution of the products after reaction is superior and the utilization ratio of the raw materials is high.Type: ApplicationFiled: July 28, 2008Publication date: February 5, 2009Applicant: Lanzhou Institute of Chemical Physics, Chinese Academy of SciencesInventors: Jing CHEN, Zhonghua TANG, Chungu XIA, Xinzhi ZHANG, Zhen LI
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Publication number: 20080293954Abstract: The present invention relates to a process for synthesizing trioxymethylene, wherein an aqueous solution of formaldehyde is used as the reactant; and an acidic ionic liquid in an amount of from 0.01 to 10 wt % is used as a catalyst.Type: ApplicationFiled: January 18, 2008Publication date: November 27, 2008Applicants: Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Blue Diamond International Co., Ltd.Inventors: Jing CHEN, Heyuan Song, Chungu Xia, Zhonghua Tang, Xinzhi Zhang, Zhen Li, Enxiu Guo
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Publication number: 20070191629Abstract: The invention disclosed a method for producing 3-hydroxy-propionate and 1,3-propylene glycol by using epoxide as raw material. In the method, a transitional metal cobalt catalyst and a cocatalyst for the hydroesterification reaction among epoxide, carbon monoxide, and alcohol were chosen, and a hydrogenation catalyst for hydrogenating 3-hydroxy-propionate as well as the corresponding process conditions were selected for producing 3-hydroxy-propionate and 1,3-propylene glycol.Type: ApplicationFiled: September 6, 2006Publication date: August 16, 2007Inventors: Jing Chen, Fang Cui, Jianhua Liu, Chungu Xia, Jin Tong
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Patent number: 7244854Abstract: The present invention relates to a method of synthesizing trioxymethylene from formaldehyde by the catalytic action of an acidic ionic liquid. In the method, formaldehyde solution with a concentration of 30˜80 wt % is used as reactant, and an ionic liquid is used as catalyst. The cation moiety of the catalyst is selected from either imidazoles cation or pyridines cation, and the anion moiety of the catalyst is selected from one of p-tolyl benzene sulfonate, trifluoromethyl sulfonate, and hydrogen sulfate. In the present invention, ionic liquid is used, for the first time, as a catalyst to synthesize trioxymethylene from formaldehyde. The catalyst can be circularly used for continuous sampling.Type: GrantFiled: December 8, 2006Date of Patent: July 17, 2007Assignee: Lanzhou Institute of Chemical Physics Chinese Academy of SciencesInventors: Chungu Xia, Zhonghua Tang, Jing Chen, Xinzhi Zhang, Zhen Li, Enxiu Guo