Patents by Inventor Fengxian LI
Fengxian LI 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: 10087125Abstract: Disclosed in the present invention are a chromium-free gas phase fluorination catalyst and an application thereof. The precursor of the related chromium-free gas phase fluorination catalyst consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to roasting and fluorination treating to obtain the chromium-free gas phase fluorination catalyst. The precursor of the catalyst is roasted at 400-500° C. and fluoridized with hydrogen fluoride at 350-450° C. to obtain the chromium-free gas phase fluorination catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.Type: GrantFiled: November 7, 2017Date of Patent: October 2, 2018Assignee: XI'AN MODERN CHEMISTRY RESEARCH INSTITUTEInventors: Jian Lu, Bo Wang, Yue Qin, Wei Mao, Liangang Kou, Zhenhua Zhang, Fei He, Wei Zhang, Hui Ma, Yangbo Ma, Zhijun Hao, Chunying Li, Yongmei Du, Fengxian Li, Sheng Han
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Publication number: 20180057431Abstract: Disclosed in the present invention are a chromium-free gas phase fluorination catalyst and an application thereof. The precursor of the related chromium-free gas phase fluorination catalyst consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to roasting and fluorination treating to obtain the chromium-free gas phase fluorination catalyst. The precursor of the catalyst is roasted at 400-500° C. and fluoridized with hydrogen fluoride at 350-450° C. to obtain the chromium-free gas phase fluorination catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.Type: ApplicationFiled: November 7, 2017Publication date: March 1, 2018Inventors: Jian LU, Bo WANG, Yue QIN, Wei MAO, Liangang KOU, Zhenhua ZHANG, Fei HE, Wei ZHANG, Hui MA, Yangbo MA, Zhijun HAO, Chunying LI, Yongmei DU, Fengxian LI, Sheng HAN
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Patent number: 9878969Abstract: Disclosed is a process for the preparation of 1,3,3,3-tetrafluoropropene, comprising: (a) a compound having the formula CF3-xClxCHClCHF2-yCly and in the presence of a compound catalyst, undergoes, through n serially-connected reactors, gas-phase fluorination with hydrogen fluoride, producing 1,2,3-trichloro-1,1,3-trifluoropropane, and 1,2-dichloro-1,1,3,3-tetrafluoropropane; in said formula, x=1, 2 or 3; y=1 or 2, and 3?x+y?5; (b) 1,2,3-trichloro-1,1,3-trifluoropropane, and 1,2-dichloro-1,1,3,3-tetrafluoropropane undergo, in the presence of a dehalogenation catalyst, gas-phase dehalogenation with hydrogen, producing 3-chloro-1,3,3-trifluoropropene, and 1,1,3,3-tetrafluoropropene; (c) 3-chloro-1,3,3-trifluoropropene and 1,1,3,3-tetrafluoropropene undergo, in the presence of a fluorination catalyst, gas-phase fluorination with hydrogen fluoride, producing 1,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 1,3,3,3-tetrafluoropropene.Type: GrantFiled: February 5, 2015Date of Patent: January 30, 2018Assignee: Xi'an Modern Chemistry Research InstituteInventors: Jian Lv, Hui Ma, Yujie Gu, Bo Wang, Yue Qin, Zhenhua Zhang, Zhijun Hao, Chunying Li, Fengxian Li, Jing Lv, Yanbo Bai
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Patent number: 9862661Abstract: Disclosed is a process for the preparation of 2,3,3,3-tetrafluoropropene, comprising the following two reaction steps: a. a compound having the formula CF3-xClxCF2-yClyCH2Cl undergoes gas-phase fluorination with hydrogen fluoride through n serially-connected reaction vessels in the presence of a compound catalyst, producing 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane; in said formula, x=1, 2, 3, y=1, 2, and 3?x+y?5; b. the 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane undergo gas-phase dehalogenation with hydrogen in the presence of a dehalogenation catalyst, producing 2,3,3,3-tetrafluoropropene and 3-chloro-2,3,3-trifluoropropene, then separation and refining are performed, producing 2,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 2,3,3,3-tetrafluoropropene.Type: GrantFiled: February 5, 2015Date of Patent: January 9, 2018Assignee: Xi'an Modern Chemistry Research InstituteInventors: Jian Lv, Hui Ma, Jijun Zeng, Wei Zhang, Zhijun Hao, Sheng Han, Yongmei Du, Jianping Kang, Chunying Li, Fengxian Li
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Patent number: 9845274Abstract: Disclosed in the present invention is a chromium-free catalyst for gas-phase fluorination and an application thereof. The precursor of the related chromium-free catalyst for gas-phase fluorination consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to calcination and fluorination treatment to obtain the chromium-free catalyst for gas-phase fluorination. The precursor of the catalyst is calcined at 400-500° C. and fluorinated with hydrogen fluoride at 350-450° C. to obtain the chromium-free fluorinated catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.Type: GrantFiled: August 5, 2014Date of Patent: December 19, 2017Assignee: XI'AN MODERN CHEMISTRY RESEARCH INSTITUTEInventors: Jian Lu, Bo Wang, Yue Qin, Wei Mao, Liangang Kou, Zhenhua Zhang, Fei He, Wei Zhang, Hui Ma, Yangbo Ma, Zhijun Hao, Chunying Li, Yongmei Du, Fengxian Li, Sheng Han
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Publication number: 20170342003Abstract: Disclosed is a process for the preparation of 1,3,3,3-tetrafluoropropene, comprising: (a) a compound having the formula CF3-xClxCHClCHF2-yCly and in the presence of a compound catalyst, undergoes, through n serially-connected reactors, gas-phase fluorination with hydrogen fluoride, producing 1,2,3-trichloro-1,1,3-trifluoropropane, and 1,2-dichloro-1,1,3,3-tetrafluoropropane; in said formula, x=1, 2 or 3; y=1 or 2, and 3?x+y?5; (b) 1,2,3-trichloro-1,1,3-trifluoropropane, and 1,2-dichloro-1,1,3,3-tetrafluoropropane undergo, in the presence of a dehalogenation catalyst, gas-phase dehalogenation with hydrogen, producing 3-chloro-1,3,3-trifluoropropene, and 1,1,3,3-tetrafluoropropene; (c) 3-chloro-1,3,3-trifluoropropene and 1,1,3,3-tetrafluoropropene undergo, in the presence of a fluorination catalyst, gas-phase fluorination with hydrogen fluoride, producing 1,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 1,3,3,3-tetrafluoropropene.Type: ApplicationFiled: February 5, 2015Publication date: November 30, 2017Inventors: Jian LV, Hui MA, Yujie GU, Bo WANG, Yue QIN, Zhenhua ZHANG, Zhijun HAO, Chunying LI, Fengxian LI, Jing LV, Yanbo BAI
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Publication number: 20170327441Abstract: Disclosed is a process for the preparation of 2,3,3,3-tetrafluoropropene, comprising the following two reaction steps: a. a compound having the formula CF3-xClxCF2-yClyCH2Cl undergoes gas-phase fluorination with hydrogen fluoride through n serially-connected reaction vessels in the presence of a compound catalyst producing 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane; in said formula, x=1, 2, 3, y=1, 2, and 3?x+y?5; b. the 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane undergo gas-phase dehalogenation with hydrogen in the presence of a dehalogenation catalyst, producing 2,3,3,3-tetrafluoropropene and 3-chloro-2,3,3-trifluoropropene, then separation and refining are performed, producing 2,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 2,3,3,3-tetrafluoropropene.Type: ApplicationFiled: February 5, 2015Publication date: November 16, 2017Inventors: Jian LV, Hui MA, Jijun ZENG, Wei ZHANG, Zhijun HAO, Sheng HAN, Yongmei DU, Jianping KANG, Chunying LI, Fengxian LI
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Publication number: 20160311736Abstract: Disclosed in the present invention is a chromium-free catalyst for gas-phase fluorination and an application thereof. The precursor of the related chromium-free catalyst for gas-phase fluorination consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to calcination and fluorination treatment to obtain the chromium-free catalyst for gas-phase fluorination. The precursor of the catalyst is calcined at 400-500° C. and fluorinated with hydrogen fluoride at 350-450° C. to obtain the chromium-free fluorinated catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.Type: ApplicationFiled: August 5, 2014Publication date: October 27, 2016Inventors: Jian LU, Bo WANG, Yue QIN, Wei MAO, Liangang KOU, Zhenhua ZHANG, Fei HE, Wei ZHANG, Hui MA, Yangbo MA, Zhijun HAO, Chunying LI, Yongmei DU, Fengxian LI, Sheng HAN