Patents by Inventor Neeta Kulkarni
Neeta Kulkarni 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: 8115041Abstract: This invention relates to a process for pretreating a zeolite catalyst, specifically a zeolite which has been modified with phosphorus. The catalyst may be used in a process for alkylation of aromatics, specifically toluene methylation. The pretreatment is first to contact the catalyst with the process reactants used in a process for alkylation of aromatics for at least two hours at conditions to produce an alkylated aromatic product and then with a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption. The zeolite may be a MFI zeolite. This pretreatment procedure for a phosphorus-modified zeolite catalyst produces a catalyst which has increased run time, i.e., decreased deactivation rate, compared to a fresh catalyst, even after successive regenerations.Type: GrantFiled: April 2, 2008Date of Patent: February 14, 2012Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Mohammad Shafiei, Manuel Castelan, Pamela Harvey, Neeta Kulkarni
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Patent number: 8062987Abstract: A zeolite catalyst that may be used in aromatic alkylation is prepared by treating a zeolite with a phosphorus compound. The phosphorus-treated zeolite is calcined and contacted with liquid water, whereby an amount of phosphorus is removed from the phosphorus-treated zeolite. The phosphorus-treated zeolite is then heated. A method of preparing an aromatic product may also be carried out by contacting the prepared zeolite catalyst with an aromatic alkylation feed of an aromatic compound and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: GrantFiled: October 5, 2009Date of Patent: November 22, 2011Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Publication number: 20110270008Abstract: This invention relates to a process for pretreating a zeolite catalyst, specifically a zeolite which has been modified with phosphorus. The catalyst may be used in a process for alkylation of aromatics, specifically toluene methylation. The pretreatment is first to contact the catalyst with the process reactants used in a process for alkylation of aromatics for at least two hours at conditions to produce an alkylated aromatic product and then with a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption. The zeolite may be a MFI zeolite. This pretreatment procedure for a phosphorus-modified zeolite catalyst produces a catalyst which has increased run time, i.e., decreased deactivation rate, compared to a fresh catalyst, even after successive regenerations.Type: ApplicationFiled: July 11, 2011Publication date: November 3, 2011Applicant: SAUDI BASIC INDUSTRIES CORPORATIONInventors: Ashim Kumar Ghosh, Mohammad Shafiei, Manuel Castelan, Pamela Harvey, Neeta Kulkarni
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Publication number: 20110137099Abstract: In a process for the alkylation of aromatic compounds an aromatic compound; an alkylating agent; hydrogen, an inert gas or a mixture there; and steam is contacted with a shape-selective zeolite catalyst in a reactor. Hydrogen, an inert gas or a mixture thereof is introduced into the reactor which is at a temperature of about 200° C., the alkylating agent is introduced into the reactor which is at a temperature of about 480° C. and the aromatic compound may be introduced into the reactor which is at a temperature of about 200° C. or about 480° C. and steam may be introduced into the reactor which is at a temperature of about 200° C. or about 480° C. This process is applicable for toluene methylation with a shape-selective catalyst of an aluminosilicate zeolite, such as ZSM-5 which has been modified with phosphorus, to produce para-xylene (p-xylene).Type: ApplicationFiled: December 8, 2009Publication date: June 9, 2011Applicant: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Pamela Harvey, Neeta Kulkarni
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Publication number: 20110082025Abstract: A zeolite catalyst that may be used in aromatic alkylation is prepared by treating a zeolite with a phosphorus compound. The phosphorus-treated zeolite is calcined and contacted with liquid water, whereby an amount of phosphorus is removed from the phosphorus-treated zeolite. The phosphorus-treated zeolite is then heated. A method of preparing an aromatic product may also be carried out by contacting the prepared zeolite catalyst with an aromatic alkylation feed of an aromatic compound and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: ApplicationFiled: October 5, 2009Publication date: April 7, 2011Inventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Patent number: 7713898Abstract: A catalyst is formed from a phosphorus-containing ZSM-5-type zeolite. The ZSM-5-type zeolite has a silica/alumina molar ratio of at least 200. The phosphorus-containing ZSM-5-type zeolite also has a phosphorus content of at least 8% by weight of zeolite and has multiple phosphorus species exhibited by at least two 31P MAS NMR peaks with maxima at from about 0 to about ?50 ppm. The catalyst may be used in aromatic alkylation by contacting the catalyst with a feed of an aromatic hydrocarbon and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: GrantFiled: June 19, 2008Date of Patent: May 11, 2010Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Publication number: 20100113850Abstract: A catalyst and method of forming a catalyst for use in aromatic alkylation involves treating a zeolite, which may be a ZSM-5 zeolite, with a phosphorus-containing compound. The phosphorus-treated zeolite is combined with a binder material. The bound phosphorus-treated zeolite is treated with an aqueous solution of a hydrogenating metal compound by contacting the bound phosphorus-treated zeolite with the aqueous solution and separating the aqueous solution from the bound phosphorus-treated zeolite to form a hydrogenating-metal-containing zeolite catalyst. The catalyst may be used in preparing an alkyl aromatic product by contacting a hydrogenating-metal-containing zeolite catalyst with an aromatic alkylation feed of an aromatic compound and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: ApplicationFiled: November 3, 2008Publication date: May 6, 2010Inventors: Ashim Kumar Ghosh, Neeta Kulkarni
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Patent number: 7674942Abstract: A zeolite catalyst is prepared by treating a zeolite with a phosphorus compound to form a phosphorus-treated zeolite. The phosphorus-treated zeolite is heated to a temperature of about 300° C. or higher and combined with an inorganic oxide binder material to form a zeolite-binder mixture. The zeolite-binder mixture is heated to a temperature of about 400° C. or higher to form a bound zeolite catalyst. The bound zeolite may exhibit at least two 31P MAS NMR peaks with maxima at from about 0 to about ?55 ppm, with at least one peak having a maximum at from about ?40 to about ?50 ppm. Zeolites containing 10-oxygen ring pores that have been prepared in such a way may be used in aromatic alkylation by contacting the bound zeolite catalyst with an aromatic alkylation feed of an aromatic compound and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: GrantFiled: March 25, 2008Date of Patent: March 9, 2010Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Patent number: 7662737Abstract: Disclosed is a bound phosphorus-modified zeolite catalyst. Zeolite is treated with a phosphorus compound to form the phosphorus-treated zeolite. Binder material is treated with a mineral acid prior to being bound with the phosphorus-modified zeolite. The binder material includes inorganic oxide materials, such as alumina, clay, aluminum phosphate and silica-alumina, in particular, a binder of alumina or clay or their combinations. The mineral acid includes hydrochloric acid, nitric acid, phosphoric acid or sulfuric acid. The phosphorus-treated zeolite is combined with the acid-treated inorganic oxide binder material to form a zeolite-binder mixture. Water is added to form an extrudable paste which maybe shaped and is heated to a temperature of about 400° C. or higher to form a bound phosphorus-modified zeolite catalyst.Type: GrantFiled: December 22, 2005Date of Patent: February 16, 2010Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Pamela Harvey, Neeta Kulkarni
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Patent number: 7635793Abstract: A catalyst is formed from a phosphorus-containing ZSM-5-type zeolite. The ZSM-5-type zeolite has a silica/alumina molar ratio of at least 200. The phosphorus-containing ZSM-5-type zeolite also has a phosphorus content of at least 8% by weight of zeolite and has multiple phosphorus species exhibited by at least two 31P MAS NMR peaks with maxima at from about 0 to about ?50 ppm. The catalyst may be used in aromatic alkylation by contacting the catalyst with a feed of an aromatic hydrocarbon and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: GrantFiled: June 19, 2008Date of Patent: December 22, 2009Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Publication number: 20090253949Abstract: This invention relates to a process for pretreating a zeolite catalyst, specifically a zeolite which has been modified with phosphorus. The catalyst may be used in a process for alkylation of aromatics, specifically toluene methylation. The pretreatment is first to contact the catalyst with the process reactants used in a process for alkylation of aromatics for at least two hours at conditions to produce an alkylated aromatic product and then with a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption. The zeolite may be a MFI zeolite. This pretreatment procedure for a phosphorus-modified zeolite catalyst produces a catalyst which has increased run time, i.e., decreased deactivation rate, compared to a fresh catalyst, even after successive regenerations.Type: ApplicationFiled: April 2, 2008Publication date: October 8, 2009Inventors: Ashim Kumar Ghosh, Mohammad Shafiei, Manuel Castelan, Pamela Harvey, Neeta Kulkarni
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Patent number: 7576026Abstract: A method of treating a ZSM-5-type zeolite catalyst is carried out by treating a ZSM-5 zeolite catalyst having a silica/alumina mole ratio of at least about 200 with a phosphorus compound. The phosphorus-treated ZSM-5 zeolite catalyst is calcined and steamed. Steaming of the catalyst is carried out at a temperature of less than about 300° C. The phosphorus-treated ZSM-5 zeolite catalyst has less than 0.05% by weight of the catalyst of any other element other than phosphorus provided from any treatment of the ZSM-5 zeolite with a compound containing said other element. The catalyst may be used in aromatic alkylation by contacting the catalyst with feed of an aromatic hydrocarbon and an alkylating agent within a reactor under reactor conditions suitable for aromatic alkylation. Water cofeed may be introduced water into the reactor during the aromatic alkylation reaction.Type: GrantFiled: September 19, 2007Date of Patent: August 18, 2009Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey, Roncalli J. Twomey
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Patent number: 7560608Abstract: A method of modifying a zeolite catalyst to increase para-xylene selectivity of the zeolite catalyst in toluene methylation reactions is provided. The method includes forming a slurry of a ZSM-5-type zeolite and an aqueous solution of a phosphorus compound. Water is removed from the slurry to provide a non-steamed, phosphorus treated ZSM-5 zeolite catalyst without deposition of phosphorus onto the catalyst by organophosphorus vapor deposition. The resulting non-steamed, phosphorus treated ZSM-5 zeolite catalyst has a pore volume of from 0.2 ml/g or less and provides greater than 80% para-xylene selectivity of mixed xylenes when used in toluene methylation.Type: GrantFiled: October 22, 2007Date of Patent: July 14, 2009Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Gopalakrishnan Juttu, Pamela Harvey, Neeta Kulkarni
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Patent number: 7507685Abstract: A zeolite catalyst is prepared by treating a zeolite with a phosphorus compound to form a phosphorus-treated zeolite. The phosphorus-treated zeolite is heated to a temperature of about 300° C. or higher and combined with an inorganic oxide binder material to form a zeolite-binder mixture. The zeolite-binder mixture is heated to a temperature of about 400° C. or higher to form a bound zeolite catalyst. The bound zeolite may exhibit at least two 31P MAS NMR peaks with maxima at from about 0 to about ?55 ppm, with at least one peak having a maximum at from about ?40 to about ?50 ppm. Zeolites containing 10-oxygen ring pores that have been prepared in such a way may be used in aromatic alkylation by contacting the bound zeolite catalyst with an aromatic alkylation feed of an aromatic compound and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: GrantFiled: March 25, 2008Date of Patent: March 24, 2009Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Publication number: 20090036723Abstract: A method of modifying a zeolite catalyst to increase para-xylene selectivity of the zeolite catalyst in toluene methylation reactions is provided. The method includes forming a slurry of a ZSM-5-type zeolite and an aqueous solution of a phosphorus compound. Water is removed from the slurry to provide a non-steamed, phosphorus treated ZSM-5 zeolite catalyst without deposition of phosphorus onto the catalyst by organophosphorus vapor deposition. The resulting non-steamed, phosphorus treated ZSM-5 zeolite catalyst has a pore volume of from 0.2 ml/g or less and provides greater than 80% para-xylene selectivity of mixed xylenes when used in toluene methylation.Type: ApplicationFiled: October 22, 2007Publication date: February 5, 2009Inventors: Ashim Kumar Ghosh, Gopalakrishnan Juttu, Pamela Harvey, Neeta Kulkarni
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Publication number: 20080305945Abstract: A catalyst is formed from a phosphorus-containing ZSM-5-type zeolite. The ZSM-5-type zeolite has a silica/alumina molar ratio of at least 200. The phosphorus-containing ZSM-5-type zeolite also has a phosphorus content of at least 8% by weight of zeolite and has multiple phosphorus species exhibited by at least two 31P MAS NMR peaks with maxima at from about 0 to about ?50 ppm. The catalyst may be used in aromatic alkylation by contacting the catalyst with a feed of an aromatic hydrocarbon and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: ApplicationFiled: June 19, 2008Publication date: December 11, 2008Inventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Publication number: 20080306317Abstract: A catalyst is formed from a phosphorus-containing ZSM-5-type zeolite. The ZSM-5-type zeolite has a silica/alumina molar ratio of at least 200. The phosphorus-containing ZSM-5-type zeolite also has a phosphorus content of at least 8% by weight of zeolite and has multiple phosphorus species exhibited by at least two 31P MAS NMR peaks with maxima at from about 0 to about ?50 ppm. The catalyst may be used in aromatic alkylation by contacting the catalyst with a feed of an aromatic hydrocarbon and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: ApplicationFiled: June 19, 2008Publication date: December 11, 2008Inventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Publication number: 20080275280Abstract: A zeolite catalyst is prepared by treating a zeolite with a phosphorus compound to form a phosphorus-treated zeolite. The phosphorus-treated zeolite is heated to a temperature of about 300° C. or higher and combined with an inorganic oxide binder material to form a zeolite-binder mixture. The zeolite-binder mixture is heated to a temperature of about 400° C. or higher to form a bound zeolite catalyst. The bound zeolite may exhibit at least two 31P MAS NMR peaks with maxima at from about 0 to about ?55 ppm, with at least one peak having a maximum at from about ?40 to about ?50 ppm. Zeolites containing 10-oxygen ring pores that have been prepared in such a way may be used in aromatic alkylation by contacting the bound zeolite catalyst with an aromatic alkylation feed of an aromatic compound and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: ApplicationFiled: March 25, 2008Publication date: November 6, 2008Inventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Publication number: 20080176736Abstract: A zeolite catalyst is prepared by treating a zeolite with a phosphorus compound to form a phosphorus-treated zeolite. The phosphorus-treated zeolite is heated to a temperature of about 300° C. or higher and combined with an inorganic oxide binder material to form a zeolite-binder mixture. The zeolite-binder mixture is heated to a temperature of about 400° C. or higher to form a bound zeolite catalyst. The bound zeolite may exhibit at least two 31P MAS NMR peaks with maxima at from about 0 to about ?55 ppm, with at least one peak having a maximum at from about ?40 to about ?50 ppm. Zeolites containing 10-oxygen ring pores that have been prepared in such a way may be used in aromatic alkylation by contacting the bound zeolite catalyst with an aromatic alkylation feed of an aromatic compound and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: ApplicationFiled: March 25, 2008Publication date: July 24, 2008Applicant: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey
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Patent number: 7399727Abstract: A catalyst is formed from a phosphorus-containing ZSM-5-type zeolite. The ZSM-5-type zeolite has a silica/alumina molar ratio of at least 200. The phosphorus-containing ZSM-5-type zeolite also has a phosphorus content of at least 8% by weight of zeolite and has multiple phosphorus species exhibited by at least two 31P MAS NMR peaks with maxima at from about 0 to about ?50 ppm. The catalyst may be used in aromatic alkylation by contacting the catalyst with a feed of an aromatic hydrocarbon and an alkylating agent under reaction conditions suitable for aromatic alkylation.Type: GrantFiled: May 25, 2005Date of Patent: July 15, 2008Assignee: Saudi Basic Industries CorporationInventors: Ashim Kumar Ghosh, Neeta Kulkarni, Pamela Harvey