Patents by Inventor Walter S. Dubner
Walter S. Dubner 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).
-
Patent number: 10233166Abstract: A propylene oxide separation system that comprises a distillation column, a decanter, and water wash system. The distillation column is configured to receive a crude propylene oxide stream, discharge an impurity stream that comprises methanol and water, and discharge a bottoms stream that comprises a majority of the propylene oxide entering in the crude propylene oxide stream. The decanter is configured to receive at least a portion of the impurity stream and a hydrocarbon solvent to provide for formation in the decanter of an organic phase and an aqueous phase. The organic phase comprises propylene oxide and hydrocarbon solvent, and is sent to the distillation column. The aqueous phase comprises a majority weight percent of the methanol and the water entering in the impurity stream. The water wash system is configured to receive and purge the aqueous phase from the propylene oxide separation system.Type: GrantFiled: January 30, 2017Date of Patent: March 19, 2019Assignee: Lyondell Chemical Technology, L.P.Inventors: Xiangmin Li, Te Chang, David W. Leyshon, Walter S. Dubner, Elizabeth I. Ross-Medgaarden
-
Patent number: 9914684Abstract: Allyl alcohol production processes are generally described herein. One or more of the processes generally include contacting a propylene oxide stream with an isomerization catalyst under isomerization conditions sufficient to form an isomerization product stream including allyl alcohol, wherein the propylene oxide stream includes a total impurity concentration of at least 100 ppm. One or more of the processes generally includes purging at least a portion of a stream from one or more separation unit(s).Type: GrantFiled: November 16, 2016Date of Patent: March 13, 2018Assignee: Lyondell Chemical Technology, L.P.Inventors: Sarthak Gaur, Beaven S. Mandimutsira, Daniel F. White, Walter S. Dubner
-
Publication number: 20170144953Abstract: Allyl alcohol production processes are generally described herein. One or more of the processes generally include contacting a propylene oxide stream with an isomerization catalyst under isomerization conditions sufficient to form an isomerization product stream including allyl alcohol, wherein the propylene oxide stream includes a total impurity concentration of at least 100 ppm. One or more of the processes generally includes purging at least a portion of a stream from one or more separation unit(s).Type: ApplicationFiled: November 16, 2016Publication date: May 25, 2017Applicant: Lyondell Chemical Technology, L.P.Inventors: Sarthak Gaur, Beaven S. Mandimutsira, Daniel F. White, Walter S. Dubner
-
Publication number: 20170137394Abstract: A propylene oxide separation system that comprises a distillation column, a decanter, and water wash system. The distillation column is configured to receive a crude propylene oxide stream, discharge an impurity stream that comprises methanol and water, and discharge a bottoms stream that comprises a majority of the propylene oxide entering in the crude propylene oxide stream. The decanter is configured to receive at least a portion of the impurity stream and a hydrocarbon solvent to provide for formation in the decanter of an organic phase and an aqueous phase. The organic phase comprises propylene oxide and hydrocarbon solvent, and is sent to the distillation column. The aqueous phase comprises a majority weight percent of the methanol and the water entering in the impurity stream. The water wash system is configured to receive and purge the aqueous phase from the propylene oxide separation system.Type: ApplicationFiled: January 30, 2017Publication date: May 18, 2017Applicant: Lyondell Chemical Technology, L.P.Inventors: Xiangmin Li, Te Chang, David W. Leyshon, Walter S. Dubner, Elizabeth I. Ross-Medgaarden
-
Patent number: 9593090Abstract: A propylene oxide separation system that comprises a distillation column, a decanter, and water wash system. The distillation column is configured to receive a crude propylene oxide stream, discharge an impurity stream that comprises methanol and water, and discharge a bottoms stream that comprises a majority of the propylene oxide entering in the crude propylene oxide stream. The decanter is configured to receive at least a portion of the impurity stream and a hydrocarbon solvent to provide for formation in the decanter of an organic phase and an aqueous phase. The organic phase comprises propylene oxide and hydrocarbon solvent, and is sent to the distillation column. The aqueous phase comprises a majority weight percent of the methanol and the water entering in the impurity stream. The water wash system is configured to receive and purge the aqueous phase from the propylene oxide separation system.Type: GrantFiled: July 21, 2014Date of Patent: March 14, 2017Assignee: Lyondell Chemical Technology, L.P.Inventors: Xiangmin Li, Te Chang, David W. Leyshon, Walter S. Dubner, Elizabeth I. Ross-Medgaarden
-
Publication number: 20150031905Abstract: A propylene oxide separation system that comprises a distillation column, a decanter, and water wash system. The distillation column is configured to receive a crude propylene oxide stream, discharge an impurity stream that comprises methanol and water, and discharge a bottoms stream that comprises a majority of the propylene oxide entering in the crude propylene oxide stream. The decanter is configured to receive at least a portion of the impurity stream and a hydrocarbon solvent to provide for formation in the decanter of an organic phase and an aqueous phase. The organic phase comprises propylene oxide and hydrocarbon solvent, and is sent to the distillation column. The aqueous phase comprises a majority weight percent of the methanol and the water entering in the impurity stream. The water wash system is configured to receive and purge the aqueous phase from the propylene oxide separation system.Type: ApplicationFiled: July 21, 2014Publication date: January 29, 2015Inventors: Xiangmin Li, Te Chang, David W. Leyshon, Walter S. Dubner, Elizabeth I. Ross-Medgaarden
-
Publication number: 20090143630Abstract: A process comprising reacting a feed comprising isobutene and a modifier in the presence of an acidic solid catalyst to produce diisobutene is disclosed. The amount of the modifier in the feed is reduced as the catalyst ages. Lower reaction temperature is maintained throughout the catalyst life, which is less likely to corrode the reactor. When an alcohol is used as a modifier, a lower reaction temperature causes lower degree of dehydration of the modifier, thus lower water concentration is maintained, which in turn reduces the likelihood of reactor corrosion.Type: ApplicationFiled: December 4, 2007Publication date: June 4, 2009Inventors: Walter S. Dubner, Christopher P. Renaudo, Shaw-Chan Lin
-
Patent number: 7271295Abstract: A process for the production of 4-hydroxybutyraldehyde is described. The process comprises reacting allyl alcohol with a mixture of carbon monoxide and hydrogen in the presence of a solvent and a catalyst system comprising a rhodium complex and a 2,3-O-isopropylidene-2,3-dihydroxy-1,4-bis[bis(3,5-di-n-alkylphenyl)phosphino]butane. The process gives high yield of 4-hydroxybutyraldehyde compared to 3-hydroxy-2-methylpropionaldehyde.Type: GrantFiled: October 13, 2006Date of Patent: September 18, 2007Assignee: Lyondell Chemical Technology, L.P.Inventors: Daniel F. White, Walter S. Dubner
-
Patent number: 6969780Abstract: The catalytic hydrogenation of HBA and/or HMPA is improved by either or both of (1) increasing the temperature in the hydrogenation zone from about 50 to 70° C. at the inlet to above 80° C. at the outlet and (2) raising the pH of the hydrogenation feed to 4.5–6.0 before hydrogenation.Type: GrantFiled: December 20, 2004Date of Patent: November 29, 2005Assignee: Lyondell Chemical Technology, L.P.Inventors: Walter S. Dubner, Wilfred Po-sum Shum
-
Patent number: 6225509Abstract: Hydroxybutyraldehyde is formed by hydroformylation of allyl alcohol using a catalyst comprised of a rhodium complex and a ligand such as DIOP, the concentration of CO in the reaction liquid is maintained above about 4.5 mg. mols/liter.Type: GrantFiled: January 6, 2000Date of Patent: May 1, 2001Assignee: ARCO Chemical Technology, L.P.Inventors: Walter S. Dubner, Wilfred Po-sum Shum
-
Patent number: 5639928Abstract: The present invention relates to the improved liquid phase dehydration of 1-phenyl ethanol to styrene monomer, the improvement comprising the use of a residue formation inhibiting agent during the liquid phase dehydration.Type: GrantFiled: August 26, 1994Date of Patent: June 17, 1997Assignee: ARCO Chemical Technology, L.P.Inventors: Walter S. Dubner, Lawrence M. Candela
-
Patent number: 5276235Abstract: In the co-production of propylene oxide and styrene monomer, there is produced a sodium-containing heavy residue stream previously suitable only as a low grade fuel. In accordance with the invention, the heavy residue stream is contacted with acid having a molar concentration with respect to water above that which corresponds to the product salt solubility limit, and the resulting mixture is phase separated into an aqueous sodium salt-containing slurry phase and an organic phase reduced in sodium.Type: GrantFiled: February 19, 1993Date of Patent: January 4, 1994Assignee: ARCO Chemical Technology, L.P.Inventor: Walter S. Dubner
-
Patent number: 5210354Abstract: In the co-production oxide and styrene monomer, there is produced a sodium-containing heavy residue stream previously suitable only as a low grade fuel. In accordance with the invention, the heavy residue stream is contacted with aqueous acid, and the resulting mixture is phase separated into an aqueous sodium-containing phase and an organic phase reduced in sodium, and at least a portion of the organic phase reduced in sodium is converted to styrene monomer.Type: GrantFiled: May 8, 1992Date of Patent: May 11, 1993Assignee: ARCO Chemical Technology, L.P.Inventors: Walter S. Dubner, Robert N. Cochran