Patents by Inventor Ji-Yong Ryu
Ji-Yong Ryu 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: 6942784Abstract: Zeolite microsphere FCC catalysts having a novel morphology comprising a porous matrix and crystallized zeolite freely coating the walls of the pores of the matrix. The catalysts are formed from microspheres containing a metakaolin and an alumina source other than kaolin having a high pore volume.Type: GrantFiled: February 3, 2004Date of Patent: September 13, 2005Assignee: Engelhard CorporationInventors: David M. Stockwell, Stephen H. Brown, Ji-Yong Ryu
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Patent number: 5177290Abstract: The present invention is directed to a process for producing dienes which involves reacting a reaction mixture of tertiary alkyl ether and a source of oxygen over two functionally distinct catalysts under reaction conditions sufficient to produce high yields of the dienes with minimal recycle of the ether. The two functionally different catalysts are selected from a group of bifunctional catalysts having both oxidation sites and acidic sites and monofunctional acidic catalysts, such as bifunctional catalysts containing components selected from a group of oxides of vanadium, tungsten, molybdenum, copper, iron, chromium, and uranium and mixtures thereof; and monofuctional acid catalysts such as acid treated montmorillonite clays, and acid catalysts comprising an inorganic amorphous or substantially amorphous oxide material comprising the following components reacted therein:M.sup.1 /M.sup.2 /P/Owherein M.sup.1 is at least one Group IIIB element selected from the group consisting of Al, Ga, In and Tl; M.sup.Type: GrantFiled: January 10, 1991Date of Patent: January 5, 1993Assignee: Exxon Chemical Patents Inc.Inventors: Ji-Yong Ryu, Robert C. Michaelson
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Patent number: 4739111Abstract: A process for preparing a catalyst composition wherein a Metal Hydrocarboxide I, such as aluminum secbutoxide, a Metal Hydrocarboxide II, such as zirconium butoxide, an acidic phosphorus-oxygen composition, such as phosphoric acid, and water, are reacted in the presence of a liquid organic medium, such as acetone, to form a catalyst precursor composition, which is then calcined to form the catalyst, is disclosed. The catalyst is useful for condensing carboxylic acids or their ester with aldehydes or acetals to synthesize .alpha. ,.beta.-ethylenically unsaturated acids or esters, such as methylmethacrylate.Type: GrantFiled: September 11, 1985Date of Patent: April 19, 1988Assignee: Exxon Research & Engineering Co.Inventor: Ji-Yong Ryu
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Patent number: 4560790Abstract: A process for preparing a catalyst composition wherein a Metal Hydrocarboxide I, such as aluminum secbutoxide, a Metal Hydrocarboxide II, such as silicon ethoxide, an acidic phosphorus-oxygen composition, such as phosphoric acid, and water, are reacted in the presence of a liquid organic medium, such as acetone, to form a catalyst precursor composition, which is then calcined to form the catalyst, is disclosed. The catalyst is useful for condensing carboxylic acids or their ester with aldehydes or acetals to synthesize .alpha., .beta.-ethylenically unsaturated acids or esters, such as methylmethacrylate.Type: GrantFiled: August 8, 1983Date of Patent: December 24, 1985Assignee: Exxon Research & Engineering Co.Inventor: Ji-yong Ryu
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Patent number: 4444904Abstract: A process for preparing a catalyst composition wherein a Metal Hydrocarboxide I, such as aluminum sec-butoxide, a Metal Hydrocarboxide II, such as zirconium butoxide, an acidic phosphorus-oxygen composition, such as phosphoric acid, and water, are reacted in the presence of a liquid organic medium, such as acetone, to form a catalyst precursor composition, which is then calcined to form the catalyst, is disclosed. The catalyst is useful for condensing carboxylic acids or their ester with aldehydes or acetals to synthesize .alpha.,.beta.-ethylenically unsaturated acids or esters, such as methylmethacrylate.Type: GrantFiled: May 26, 1983Date of Patent: April 24, 1984Assignee: Exxon Research & Engineering Co.Inventor: Ji-Yong Ryu
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Patent number: 4430252Abstract: A process for preparing a catalyst composition wherein a Metal Hydrocarboxide I, such as aluminum secbutoxide, a Metal Hydrocarboxide II, such as silicon ethoxide, an acidic phosphorus-oxygen composition, such as phosphoric acid, and water, are reacted in the presence of a liquid organic medium, such as acetone, to form a catalyst precursor composition, which is then calcined to form the catalyst, is disclosed. The catalyst is useful for condensing carboxylic acids or their ester with aldehydes or acetals to synthesize .alpha., .beta.-ethylenically unsaturated acids or esters, such as methylmethacrylate.Type: GrantFiled: December 10, 1982Date of Patent: February 7, 1984Assignee: Exxon Research & Engineering Co.Inventor: Ji-yong Ryu
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Patent number: 4415745Abstract: Production of aromatic polyisocyanates is achieved by a multireaction process comprising sequentially; the ammoxidation of a methylated aromatic, e.g. toluene; hydrolysis of the aromatic nitrile; conversion of the resultant amide to a carbamate; condensation with aldehyde; decomposition of the condensation product; and, recovery of the aromatic polyisocyanate.Type: GrantFiled: January 28, 1982Date of Patent: November 15, 1983Assignee: Exxon Research & Engineering Co.Inventors: Ji-Yong Ryu, Arthur M. Brownstein
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Patent number: 4321402Abstract: In the process of producing an aromatic polyisocyanate from a methylated benzene compound having the sequential steps of ammoxidation, hydrolysis, conversion of amide to carbamate, condensation and conversion of polycarbamate ester to polyisocyanate, the improvement of converting said amide to said carbamate in a one-step reaction wherein said amide is reacted with an N-halogenating agent in the presence of alcohol and in a reaction medium having a pH of from neutral to basic and a temperature greater than 40.degree. C.Type: GrantFiled: August 18, 1980Date of Patent: March 23, 1982Assignee: Exxon Research & Engineering Co.Inventors: Ji-Yong Ryu, Krishna K. Rao, Ralph J. Spohn, Robert Drogin
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Patent number: 4313021Abstract: A process for the conversion of aromatic hydrocarbons, e.g., reacting an alkylating agent, preferably an olefin, with an aromatic hydrocarbon. The process uses a novel catalyst prepared by subjecting alumina to an anhydrous tetravalent titanium fluoride complex of an organic compound selected from the group of organic compounds containing at least one methoxy group per molecule of organic compounds having at least one electron donor atom and double bond per molecule, and heat treating the resulting impregnated alumina in an inert atmosphere.Type: GrantFiled: October 6, 1980Date of Patent: January 26, 1982Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4312785Abstract: A process for the conversion of aromatic hydrocarbons, e.g., reacting an alkylating agent, preferably an olefin, with an aromatic hydrocarbon. The process uses a novel catalyst prepared by subjecting alumina to an anhydrous tetravalent titanium fluoride complex of an organic compound selected from the group of organic compounds containing at least one methoxy group per molecule or organic compounds having at least one electron donor atom and double bond per molecule, and heat treating the resulting impregnated alumina in an inert atmosphere.Type: GrantFiled: October 5, 1980Date of Patent: January 26, 1982Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4275052Abstract: High surface area alumina, and a method of preparing them. More specifically, a method of preparing aluminas having a surface area of from about 300 square meters per gram to about 700 square meters per gram, by preparing a first solution of an aluminum alkoxide and an organic solvent selected from the group consisting of ethers, ketones, aldehydes, and mixtures thereof, admixing the first solution with a second solution comprising water and an organic solvent selected from the group consisting of ethers, ketones, aldehydes, and mixtures thereof, to form a solid material, and drying and calcining the solid material to recover alumina. Also, an alumina with an average micropore diameter of from about 20 angstroms to about 100 angstroms, and a total pore volume of from about 0.35 ml/g to about 1 ml/g.Type: GrantFiled: May 2, 1980Date of Patent: June 23, 1981Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4243827Abstract: A process for the conversion of aromatic hydrocarbons, e.g., reacting an alkylating agent, preferably an olefin, with an aromatic hydrocarbon. The process uses a novel catalyst prepared by subjecting alumina to an anhydrous tetravalent titanium flouride complex of an organic compound selected from the group of organic compounds containing at least one methoxy group per molecule or organic compounds having at least one electron donor atom and double bond per molecule, and heat treating the resulting impregnated alumina in an inert atmosphere.Type: GrantFiled: April 6, 1979Date of Patent: January 6, 1981Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4123468Abstract: A process for the conversion of aromatic hydrocarbons is disclosed which is especially useful for reaction of an alkylating agent, preferably propylene, with an aromatic hydrocarbon. Novel feature is use of a catalyst system comprising TiCl.sub.4 and a Group III-A metal oxide.Type: GrantFiled: April 21, 1977Date of Patent: October 31, 1978Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4119675Abstract: Process for the conversion of aromatic hydrocarbons. Especially useful for reaction of an alkylating agent, preferably propylene, with an aromatic hydrocarbon. Novel feature is use of a catalyst system comprising TiF.sub.4 and a metal oxide which possesses surface hydroxyl groups.Type: GrantFiled: April 21, 1977Date of Patent: October 10, 1978Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4119677Abstract: A process for the conversion of aromatic hydrocarbons is disclosed which is especially useful for reaction of an alkylating agent, preferably propylene, with an aromatic hydrocarbon. Novel feature is use of a catalyst system comprising TiCl.sub.4 and a Group III-A metal oxide.Type: GrantFiled: April 21, 1977Date of Patent: October 10, 1978Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4119676Abstract: Process for the conversion of aromatic hydrocarbons. Especially useful for reaction of an alkylating agent, preferably propylene, with an aromatic hydrocarbon. Novel feature is use of a catalyst system comprising TiF.sub.4 and a metal oxide which possesses surface hydroxyl groups.Type: GrantFiled: April 21, 1977Date of Patent: October 10, 1978Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4110410Abstract: Olefinic hydrocarbons containing from 2 to about 6 carbon atoms are oligomerized by treatment with a heterogeneous oligomerization catalyst which has been prepared by heating a metal oxide, thereafter contacting the metal oxide with titanium tetrachloride vapor in a series of steps at progressively higher temperatures ranging from about 50.degree. to about 600.degree. C. and thereafter heating the impregnated metal oxide in contact with hydrogen gas at an elevated temperature in the range of from about 300.degree. to about 700.degree. C. to reduce the titanium to a valence state of less than +4.Type: GrantFiled: June 22, 1977Date of Patent: August 29, 1978Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4108920Abstract: Olefinic hydrocarbons containing from 3 to about 6 carbon atoms are oligomerized in the presence of a heterogeneous oligomerization catalyst which has been prepared by heating a metal oxide with hydrogen or nitrogen at an elevated temperature, impregnating the heated metal oxide with a solution of titanium tetrafluoride, cold rolling the impregnated oxide followed by steam drying at a temperature of about 100.degree. C. and further drying at an elevated temperature above 100.degree. C.Type: GrantFiled: June 1, 1977Date of Patent: August 22, 1978Assignee: UOP Inc.Inventor: Ji-Yong Ryu
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Patent number: 4061689Abstract: A process for the converting of aromatic hydrocarbons, e.g., reacting an alkylating agent, preferably an olefin, with an aromatic hydrocarbon. The process uses a catalyst prepared by reducing, with hydrogen gas at an elevated temperature, titanium tetrafluoride on an inorganic oxide which contained surface hydroxyl groups.Type: GrantFiled: December 29, 1975Date of Patent: December 6, 1977Assignee: UOP Inc.Inventors: Ji-Yong Ryu, Dalia Germanas
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Patent number: 4048108Abstract: Olefinic hydrocarbons containing from 3 to about 6 carbon atoms in which the olefinic linkage is in a terminal position are oligomerized by treatment with a heterogeneous oligomerization catalyst which is prepared by treating an activated metal oxide of Group IIIA of the Periodic Table with a titanium tetrafluoride compound at an elevated temperature.Type: GrantFiled: December 29, 1975Date of Patent: September 13, 1977Assignee: UOP Inc.Inventor: Ji-Yong Ryu