Patents by Inventor Yu-Hwa E. Sheu
Yu-Hwa E. Sheu 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: 5519099Abstract: A catalyst composition is disclosed for catalyzing the polymerization and copolymerization reactions of ethylene monomers, with or without another olefin monomer. The catalyst composition comprises a metallocene compound represented by the the formula of (C.sub.5 R.sub.n H.sub.5-n)(L)MXY or the formula of (C.sub.5 R.sub.n H.sub.5-n)(L)MX.sup.+ A.sup.- ; wherein: (a) C.sub.5 R.sub.n H.sub.5-n is a substituted or unsubstituted cyclopendadienyl group; (b) L is tetrapyrazolyl borate, hydrotrispyrazolyl borate, dihydrotrispyrazolyl borate or hydrotris-3,5-dimethyl; (c) M is Group IIIB, Group IVB, or Group VB transitional metal; (d) X is a C.sub.1 to C.sub.4 alkyl or alkenyl group, an aromatic group, an alkylaryl, a halogen, a hydrogen, or a silane group; (e) Y, which can the same as or different from X, is a C.sub.1 to C.sub.4 alkyl or alkenyl group, an aromatic group, an alkylaryl, a halogen, a hydrogen, or a silane group; and (f) A.sup.- is non-coordinated or loosely coordinated bulky anion. Examples of the (C.Type: GrantFiled: June 7, 1995Date of Patent: May 21, 1996Assignee: Industrial Technology Research InstituteInventors: Shian-Jy Wang, Yi-Chun Chen, Shu-Hua Chan, Jing-Cherng Tsai, Yu-Hwa E. Sheu
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Patent number: 5436376Abstract: A plural stage process for the production of tertiary butyl alcohol from isobutane wherein isobutane is reacted with oxygen in a first reactor to prepare a primary liquid reaction mixture comprising unreacted isobutane, tertiary butyl alcohol, tertiary butyl hydroperoxide and small amounts of oxygen-containing by-products, distilling the primary reaction product to provide a first lighter isobutane recycle distillation fraction and a first heavier liquid distillation fraction comprising the debutanized mixture of tertiary butyl hydroperoxide with tertiary butyl alcohol, diluting the first heavier liquid distillation fraction with an amount of tertiary butyl alcohol sufficient to provide a feed mixture comprising about 15 to 25 wt. % of tertiary butyl hydroperoxide, about 75 to 85 wt.Type: GrantFiled: August 11, 1994Date of Patent: July 25, 1995Assignee: Texaco Chemical Inc.Inventors: Yu-Hwa E. Sheu, John R. Sanderson, Mark A. Mueller, William A. Smith
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Patent number: 5414145Abstract: Tertiary butyl alcohol (TBA) is prepared by non-catalytically reacting isobutane with oxygen to provide a reaction product comprising isobutane, peroxides including tertiary butyl hydroperoxide and impurities, charging the de-isobutanized reaction product and a soluble hydroperoxide decomposition catalyst to a first hydroperoxide decomposition reactor fitted with a fractionating column to provide a liquid reaction product comprising TBA, catalyst, hydroperoxides, and contaminants, and a vaporized decomposition product, cooling said vaporized reaction product to provide a condensate, and recovering a portion as a TBA reaction product, charging the liquid reaction product to a second hydroperoxide decomposition reactor to substantially completely decompose the peroxides therein and to form a second hydroperoxide decomposition product, which is charged to a second distillation column and separated therein into a third lighter overhead fraction comprising TBA, and a third heavier liquid fraction comprising normalType: GrantFiled: August 11, 1994Date of Patent: May 9, 1995Assignee: Texaco Chemical Inc.Inventors: Yu-Hwa E. Sheu, John R. Sanderson, Mark A. Mueller, William A. Smith
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Patent number: 5401889Abstract: A method for preparing tertiary butyl alcohol wherein a feedstock comprising a solution of tertiary butyl hydroperoxide in a cosolvent mixture of tertiary butyl alcohol with isobutane is charged to a hydroperoxide decomposition reaction zone containing a catalytically effective amount of a hydroperoxide decomposition catalyst and is brought into contact with the catalyst in liquid phase with agitation under hydroperoxide decomposition reaction conditions to convert the tertiary butyl hydroperoxide to decomposition products, principally tertiary butyl alcohol.Type: GrantFiled: November 12, 1993Date of Patent: March 28, 1995Assignee: Texaco Chemical Inc.Inventors: John R. Sanderson, Mark A. Mueller, Yu-Hwa E. Sheu
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Patent number: 5354430Abstract: Contaminants are removed from impure propylene oxide by fractionating in a first column to remove overhead essentially all of the pentenes and pentanes and most of the oxygen-containing impurities to provide a partially purified first propylene oxide bottoms fraction, extractively distilling the first bottoms fraction in a second extractive column using a C.sub.2 to C.sub.6 alkylene glycol extractive distillation agent to form a second overhead fraction comprising propylene oxide, hexenes, hexanes, water, residual quantities of pentenes and pentanes and oxygen-containing impurities, extractively distilling the second overhead fraction in a third column using a C.sub.6 to C.sub.10 alkane hydrocarbon extractive distillation agent to form a third bottoms fraction comprising the extractive distillation agent, propylene oxide, hexenes, hexanes, residual quantities of pentenes and pentanes and water, and extractively distilling said third bottoms fraction in a fourth column using a C.sub.6 to C.sub.Type: GrantFiled: October 26, 1993Date of Patent: October 11, 1994Assignee: Texaco Chemical CompanyInventors: William K. Culbreth, III, Yu-Hwa E. Sheu, David G. Pottratz
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Patent number: 5276215Abstract: Disclosed is a one-step method for synthesis of alkylphenols which comprises reacting phenol with the corresponding olefin under adiabatic conditions in the presence of a zeolite catalyst, preferably a dealuminated Y-zeolite, a modified Y-zeolite, or a .beta.-zeolite.Type: GrantFiled: April 9, 1993Date of Patent: January 4, 1994Assignee: Texaco Chemical CompanyInventors: John F. Knifton, Yu-Hwa E. Sheu, Pei-Shing Dai
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Patent number: 5243101Abstract: Motor-fuel tertiary butyl alcohol contaminated with residual amounts of tertiary butyl hydroperoxide, ditertiary butyl peroxide and allyl tertiary butyl peroxide (which is prepared, for example, by reacting propylene with tertiary butyl hydroperoxide to form propylene oxide and a motor fuel grade tertiary butyl alcohol reaction product) can be effectively catalytically treated under mild conversion conditions including a temperature of about 160.degree. to 200.degree. C. with a catalyst consisting essentially of vitrified silica to substantially completely decompose the peroxide contaminants to thereby provide a treated tertiary butyl alcohol product substantially free from contaminating quantities of such peroxides.Type: GrantFiled: June 12, 1992Date of Patent: September 7, 1993Assignee: Texaco Chemical CompanyInventors: John R. Sanderson, Yu-Hwa E. Sheu, Michael W. Peters
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Patent number: 5171896Abstract: Disclosed is a one step method for synthesis of alkylphenols which comprises reacting phenol with the corresponding olefin under adiabatic conditions in the presence of a catalyst comprising an acidic montmorillonite clay having the structure:M.sub.x/n.sup.n+ .multidot.yH.sub.2 O(Al.sub.4-x Mg.sub.x)(Si.sub.8)O.sub.20 (OH).sub.4where M represent the interlamellar (balancing cation, normally sodium or lithium) and x, y and n are integers, wherein the acidic clay has been pretreated with an acid and optionally has deposited thereon an acid selected from the group consisting hydrogen fluoride, a fluorosulfonic acid or a mineral acid, at a temperature of from 60.degree. C. to 250.degree. C. and a pressure of from near atmospheric to about 500 psi.Type: GrantFiled: March 5, 1992Date of Patent: December 15, 1992Assignee: Texaco Chemical CompanyInventors: John F. Knifton, Yu-Hwa E. Sheu
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Patent number: 5160587Abstract: An extractive distillation agent consisting essentially of dipropylene glycol is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water, acetone and methanol to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide contaminated with reduced quantities of acetone and methanol, and a heavier bottoms distillation fraction containing substantially all of the dipropylene glycol, water and acetone and some of the methanol introduced into the distillation column.Type: GrantFiled: November 1, 1991Date of Patent: November 3, 1992Assignee: Texaco Chemical CompanyInventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz
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Patent number: 5154804Abstract: An extractive distillation agent consisting essentially of a monohydroxy alkoxyalkanol containing 5 to 8 carbon atoms is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide, and a heavier bottoms distillation fraction containing substantially all of the monohydroxy alkoxyalkanol and water introduced into the distillation column.Type: GrantFiled: November 1, 1991Date of Patent: October 13, 1992Assignee: Texaco Chemical CompanyInventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz
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Patent number: 5154803Abstract: An extractive distillation agent consisting essentially of 2-methyl-2,4-pentanediol is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water, acetone and methanol to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide contaminated with reduced quantities of acetone and methanol, and a heavier bottoms distillation fraction containing substantially all of the 2-methyl-2,4-pentanediol, water and acetone and some of the methanol introduced into the distillation column.Type: GrantFiled: November 1, 1991Date of Patent: October 13, 1992Assignee: Texaco Chemical CompanyInventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz
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Patent number: 5145561Abstract: An extractive distillation agent consisting essentially of ethylene carbonate, propylene carbonate or a mixture thereof is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide, and a heavier bottoms distillation fraction containing substantially all of the extraction distillation solvent and water introduced into the distillation column.Type: GrantFiled: November 1, 1991Date of Patent: September 8, 1992Assignee: Texaco Chemical CompanyInventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz
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Patent number: 5145563Abstract: An extractive distillation agent consisting essentially of glycerol-1,3-di-t-butylether is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide, and a heavier bottoms distillation fraction containing substantially all of the glycerol-1,3-di-t-butylether and water introduced into the distillation column.Type: GrantFiled: November 1, 1991Date of Patent: September 8, 1992Assignee: Texaco Chemical CompanyInventors: William K. Culbreth, III, David G. Pottratz, Wei-Yang Su, Yu-Hwa E. Sheu, Carter G. Naylor
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Patent number: 5139622Abstract: An extractive distillation agent consisting essentially of triethylene glycol is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water, acetone and methanol to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide contaminated with reduced quantities of acetone and methanol, and a heavier bottoms distillation fraction containing substantially all of the triethylene glycol, water and acetone and some of the methanol introduced into the distillation column.Type: GrantFiled: October 3, 1991Date of Patent: August 18, 1992Assignee: Texaco Chemical CompanyInventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz
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Patent number: 5116466Abstract: An extractive distillation agent consisting essentially of 1-methyl-2-pyrrolidone is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water, acetone and methanol to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide contaminated with reduced quantities of acetone and methanol, and a heavier bottoms distillation fraction containing substantially all of the 1-methyl-2-pyrrolidone, water and acetone and some of the methanol introduced into the distillation column.Type: GrantFiled: November 1, 1991Date of Patent: May 26, 1992Assignee: Texaco Chemical CompanyInventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz
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Patent number: 5116467Abstract: An extractive distillation agent consisting essentially of sulfolane is fed to an extractive distillation column used for the distillation of propylene oxide contaminated with water to obtain an overhead distillate fraction consisting of essentially anhydrous propylene oxide, and a heavier bottoms distillation fraction containing substantially all of the sulfolane and water introduced into the distillation column.Type: GrantFiled: November 1, 1991Date of Patent: May 26, 1992Assignee: Texaco Chemical CompanyInventors: Edward T. Marquis, George P. Speranza, Yu-Hwa E. Sheu, William K. Culbreth, III, David G. Pottratz