Patents by Inventor John G. Zajacek
John G. Zajacek 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: 6127584Abstract: Allyl alcohol is hydroformated to 1,4-butanediol using a rhodium and trialkyl phosphine catalyst having at least 2 methyl groups, the reaction first being carried out at milder conditions and subsequently at more, severe conditions.Type: GrantFiled: April 14, 1999Date of Patent: October 3, 2000Assignee: Arco Chemical Technology, L.P.Inventors: John G. Zajacek, Wilfred P. Shum
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Patent number: 5753576Abstract: A titanium-containing molecular sieve which has been used as an oxidation catalyst is regenerated to provide a level of performance comparable to that of freshly prepared catalyst by heating at less than 400.degree. C. in the presence of molecular oxygen. The same batch of catalyst thus may be used over an extended period of time in a continuous epoxidation process by periodic practice of the aforedescribed reactivation method.Type: GrantFiled: May 18, 1995Date of Patent: May 19, 1998Assignee: ARCO Chemical Technology, L.P.Inventors: Guy L. Crocco, John G. Zajacek
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Patent number: 5741749Abstract: A titanium-containing molecular sieve which has been used as an oxidation catalyst is regenerated to provide a level of performance comparable to that of freshly prepared catalyst by heating in the presence of a gas stream comprised of less than 5 volume percent molecular oxygen. The regeneration temperature may be in the range of from 150.degree. C. to 700.degree. C. The same batch of catalyst thus may be used over an extended period of time in a continuous epoxidation process by periodic practice of the aforedescribed reactivation method.Type: GrantFiled: February 13, 1996Date of Patent: April 21, 1998Assignee: Arco Chemical Technology, L.P.Inventors: Guy L. Crocco, John G. Zajacek
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Patent number: 5695736Abstract: A crystalline molecular sieve having a framework structure isomorphous with zeolite beta and containing Si and Ti, but essentially no framework Al, usefully catalyzes olefin epoxidation wherein hydrogen peroxide is the oxidant.Type: GrantFiled: December 20, 1996Date of Patent: December 9, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Robert J. Saxton, John G. Zajacek, Guy L. Crocco
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Patent number: 5693834Abstract: Epoxides are produced by an integrated process involving molecular oxygen oxidation of a secondary alcohol, separation of the ketone co-product, and epoxidation of an olefin using the ketone-free oxidation product in the presence of a titanium silicalite catalyst and a methanol-containing diluent wherein methanol recovered from the epoxidation product mixture serves as a source of methanol in the epoxidation step.Type: GrantFiled: March 15, 1995Date of Patent: December 2, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Guy L. Crocco, John C. Jubin, Jr., John G. Zajacek
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Patent number: 5688484Abstract: A process for producing a titanium-containing zeolite such as TS-1 titanium silicalite is disclosed. A precursor mixture comprising a silica source such as tetraalkylorthosilicate, a titanium source such as titanium alkoxide, a growth medium comprising a nitrogen-containing organic base such as an amine, a fluoride-containing mineralizing agent such as hydrogen fluoride, and an optional organic solvent, is formed then heated to yield the titanium-containing zeolite as solid crystals. A controlled amount of water may be present in the growth medium. The process is capable of providing good yields of high purity zeolites containing framework titanium atoms even in the absence of a quaternary ammonium salt.Type: GrantFiled: July 29, 1996Date of Patent: November 18, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Robert J. Saxton, John G. Zajacek
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Patent number: 5684170Abstract: A crystalline molecular sieve having a framework structure isomorphous with zeolite beta and containing Si and Ti, but essentially no framework Al, usefully catalyzes olefin epoxidation wherein hydrogen peroxide is the oxidant.Type: GrantFiled: May 20, 1996Date of Patent: November 4, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Robert J. Saxton, John G. Zajacek, Guy L. Crocco
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Patent number: 5681789Abstract: An as-synthesized zeolite having titanium substituted in its lattice framework and containing an organic template such as a quaternary ammonium salt may be activated for use as a catalyst by treating said as-synthesized zeolite with ozone. At least partial removal and/or reaction of the organic template is accomplished even at moderate temperatures, in contrast to conventional calcination techniques which require the use of significantly higher activation temperatures.Type: GrantFiled: February 12, 1996Date of Patent: October 28, 1997Assignee: Arco Chemical Technology, L.P.Inventors: Robert J. Saxton, Guy L. Crocco, John G. Zajacek
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Patent number: 5679749Abstract: Molecular sieve zeolites containing niobium isomorphously substituted in their framework lattice are obtained by hydrothermal crystallization using quaternary ammonium templates. The zeolites are useful catalysts, particularly for the oxidation of hydrocarbons such as olefins.Type: GrantFiled: January 3, 1997Date of Patent: October 21, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Robert J. Saxton, John G. Zajacek
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Patent number: 5663384Abstract: Prochiral ethylenically unsaturated substrates are converted to chiral epoxides by reaction with optically active hydroperoxides in the presence of titanium-containing zeolites such as titanium zeolite beta. The method is particularly suitable for producing epoxides from unsubstituted aliphatic olefins which have exceptionally high optical purity as measured by enantiomeric excess.Type: GrantFiled: March 6, 1996Date of Patent: September 2, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Wilfred Po-sum Shum, Robert J. Saxton, John G. Zajacek
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Patent number: 5646314Abstract: The selectivity of an olefin epoxidation process catalyzed by titanium silicalite is improved by performing the epoxidation in the presence of minor amounts of nonbasic salts such as lithium chloride, sodium nitrate, potassium sulfate, and ammonium dihydrogen phosphate. For example, when hydrogen peroxide is reacted with propylene to form propylene oxide, non-selective ring-opening reactions of the propylene oxide are suppressed when low concentrations of a nonbasic salt are added to the hydrogen peroxide feed.Type: GrantFiled: February 28, 1995Date of Patent: July 8, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Guy L. Crocco, John G. Zajacek
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Patent number: 5621122Abstract: A crystalline molecular sieve having a framework structure isomorphous with zeolite beta and containing Si and Ti, but essentially no framework Al, usefully catalyzes olefin epoxidation wherein hydrogen peroxide or an organic hydroperoxide is utilized as the oxidizing agent.Type: GrantFiled: April 11, 1995Date of Patent: April 15, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Robert J. Saxton, John G. Zajacek, Guy L. Crocco, Kanthi S. Wijesekera
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Patent number: 5618512Abstract: Molecular sieve zeolites containing niobium isomorphously substituted in their framework lattice are obtained by hydrothermal crystallization using quaternary ammonium templates. The zeolites are useful catalysts, particularly for the oxidation of hydrocarbons such as olefins.Type: GrantFiled: November 30, 1995Date of Patent: April 8, 1997Assignee: Arco Chemical Technology, L.P.Inventors: Robert J. Saxton, John G. Zajacek
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Patent number: 5599987Abstract: An integrated process for producing cyclohexanone oxime, a caprolactam precursor, is provided wherein isopropanol is utilized to generate the hydrogen peroxide oxidizing agent. The acetone produced as a co-product is recycled back to the secondary alcohol by hydrogenation. Ammoximation of cyclohexanone is performed in the presence of water and an alcohol other than isopropanol such as methanol or t-butyl alcohol.Type: GrantFiled: March 31, 1995Date of Patent: February 4, 1997Assignee: Arco Chemical Technology, L.P.Inventors: Guy L. Crocco, John C. Jubin, Jr., John G. Zajacek
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Patent number: 5581000Abstract: Hydrogen peroxide is produced by oxidizing alkylammonium salts of sulfonic acid-substituted anthrahydroquinones. As said salts are highly soluble in protic polar solvents such as water and lower aliphatic alcohols, the concentration of hydrogen peroxide in the reaction product thereby obtained may be advantageously high. The anthraquinone salt co-product generated by such oxidation may be readily converted in high yield back to the starting anthrahydroquinone salt by hydrogenation.Type: GrantFiled: June 2, 1995Date of Patent: December 3, 1996Assignee: ARCO Chemical Technology, L.P.Inventors: Carmen L. Rodriguez, John G. Zajacek
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Patent number: 5554356Abstract: A molecular sieve having a zeolite beta morphology, but essentially free of alumina, is prepared from a silicon oxide source in high yield by a hydrothermal crystallization in the presence of a diquaternary templating agent. The templating agent may be derived from a diamine such as 4,4'-trimethylenebis(N-benzylpiperidine).Type: GrantFiled: June 7, 1995Date of Patent: September 10, 1996Assignee: ARCO Chemical Technology, L.P.Inventors: Robert J. Saxton, John G. Zajacek
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Patent number: 5540906Abstract: Hydrogen peroxide is produced by oxidizing alkylammonium salts of sulfonic acid-substituted anthrahydroquinones. As said salts are highly soluble in protic polar solvents such as water and lower aliphatic alcohols, the concentration of hydrogen peroxide in the reaction product thereby obtained may be advantageously high. The anthraquinone salt co-product generated by such oxidation may be readily converted in high yield back to the starting anthrahydroquinone salt by hydrogenation.Type: GrantFiled: September 28, 1994Date of Patent: July 30, 1996Assignee: ARCO Chemical Technology, L.P.Inventors: Carmen L. Rodriguez, John G. Zajacek
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Patent number: 5527520Abstract: A crystalline molecular sieve having a framework structure isomorphous with zeolite beta and containing Si and Ti, but essentially no framework Al, usefully catalyzes olefin epoxidation wherein hydrogen peroxide or an organic hydroperoxide is utilized as the oxidizing agent.Type: GrantFiled: April 11, 1995Date of Patent: June 18, 1996Assignee: ARCO Chemical Technology, L. P.Inventors: Robert J. Saxton, John G. Zajacek, Guy L. Crocco, Kanthi S. Wijesekera
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Patent number: 5523426Abstract: Epoxides are produced by an integrated process involving molecular oxygen oxidation of a secondary alcohol, separation of the ketone by-product, and epoxidation of an olefin in the presence of a titanium silicalite catalyst and a diluent, wherein a crude alcohol stream obtained by removing epoxide from the epoxidation product mixture serves as the diluent. Despite use of the crude alcohol stream, which typically comprises water, organic acids and glycols, high selectivities to epoxides such as propylene oxide are realized.Type: GrantFiled: January 4, 1995Date of Patent: June 4, 1996Assignee: ARCO Chemical Technology, L.P.Inventors: John C. Jubin, Jr., Guy L. Crocco, John G. Zajacek
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Patent number: 5508019Abstract: Crystalline aluminosilicates such as zeolite beta may be readily dealuminated using organic sulfonic acids such as methanesulfonic acid to provide useful catalysts or catalyst precursors. A high degree of aluminum removal with minimal loss of crystallinity is possible even when an organic template is not present in the starting aluminosilicate.Type: GrantFiled: June 30, 1994Date of Patent: April 16, 1996Assignee: ARCO Chemical Technology, L.P.Inventors: Robert J. Saxton, Guy L. Crocco, John G. Zajacek