Patents by Inventor Prashant Purushottam Barve
Prashant Purushottam Barve 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: 9688589Abstract: Disclosed is a process for preparation of n-propyl benzene. The process gives high selectivity and yield of n-propyl benzene by single step catalytic alkylation that involves contacting a mixture of aromatic hydrocarbon having an active hydrogen on a saturated ?-carbon, such as toluene, and an alkene, such as ethylene, in presence of a metal catalyst, a solid support, and an initiator. Following the alkylation, aqueous and organic phases are separated from a reaction mixture. The aqueous phase is separated for recovery of the catalyst, the solid support, and un-reacted aromatic hydrocarbon (e.g., toluene); and the organic phase is separated for obtaining n-propyl benzene and byproduct. Thus, the catalyst phase can be recovered and recycled in the next alkylation reaction. Also, the process facilitates recovery and recycling of the byproduct for the better selectivity.Type: GrantFiled: December 8, 2014Date of Patent: June 27, 2017Assignee: VINATI ORGANICS LIMITEDInventors: Prashant Purushottam Barve, Jayesh Ajitkumar Ashar
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Publication number: 20160046543Abstract: Disclosed is a process for preparation of n-propyl benzene. The process gives high selectivity and yield of n-propyl benzene by single step catalytic alkylation that involves contacting a mixture of aromatic hydrocarbon having an active hydrogen on a saturated ?-carbon, such as toluene, and an alkene, such as ethylene, in presence of a metal catalyst, a solid support, and an initiator. Following the alkylation, aqueous and organic phases are separated from a reaction mixture. The aqueous phase is separated for recovery of the catalyst, the solid support, and un-reacted aromatic hydrocarbon (e.g., toluene); and the organic phase is separated for obtaining n-propyl benzene and byproduct. Thus, the catalyst phase can be recovered and recycled in the next alkylation reaction. Also, the process facilitates recovery and recycling of the byproduct for the better selectivity.Type: ApplicationFiled: December 8, 2014Publication date: February 18, 2016Inventors: Prashant Purushottam Barve, Jayesh Ajitkumar Ashar
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Patent number: 8674131Abstract: The dehydrated alkali metal salts of carboxylic acid are dissolved in the alcohol such as methanol or ethanol or butanol to make their solution in corresponding alcohol. The solution alcohol is further treated with carbon dioxide under pressure or at atmospheric pressure at elevated temperature such as 150 to 200° C. The carboxylic acid gets converted into corresponding alkyl ester and calcium carbonate or sodium carbonate or potassium carbonate as the byproduct. Calcium lactate or sodium lactate or sodium acetate or sodium benzoate or sodium salicylate as alkali metal salt solution prepared in methanol or ethanol or butanol when treated with carbon dioxide under pressure or at atmospheric pressure at elevated temperature gets converted to methyl lactate or ethyl lactate or methyl acetate or methyl benzoate or methyl salicylate as product.Type: GrantFiled: September 6, 2010Date of Patent: March 18, 2014Assignee: Council of Scientific and Industrial ResearchInventors: Prashant Purushottam Barve, Bhaskar Dattatraya Kulkarni, Milind Yashwant Gupte, Sanjay Narayan Nene, Ravindra William Shinde
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Publication number: 20120296110Abstract: The dehydrated alkali metal salts of carboxylic acid are dissolved in the alcohol such as methanol or ethanol or butanol to make their solution in corresponding alcohol. The solution alcohol is further treated with carbon dioxide under pressure or at atmospheric pressure at elevated temperature such as 150 to 200° C. The carboxylic acid gets converted into corresponding alkyl ester and calcium carbonate or sodium carbonate or potassium carbonate as the byproduct. Calcium lactate or Sodium lactate or Sodium acetate or Sodium benzoate or Sodium salicylate as alkali metal salt solution prepared in Methanol or Ethanol or Butanol when treated with carbon di-oxide under pressure or at atmospheric pressure at elevated temperature gets converted to Methyl lactate or Ethyl lactate or Methyl acetate or Methyl benzoate or Methyl salicylate as product.Type: ApplicationFiled: September 6, 2010Publication date: November 22, 2012Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCHInventors: Prashant Purushottam Barve, Bhaskar Dattatraya Kulkarni, Milind Yashwant Gupte, Sanjay Narayan Nene, Ravindra William Shinde
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Patent number: 7820859Abstract: The present invention provides a commercially viable process for the preparation of highly pure and optically active L-(+)-lactic acid and S-(?)-methyl lactate, in high yield, obtained from esterification of aqueous crude lactic acid solution produced by sugar cane juice fermentation broth and methanol in continuous counter current trickle phase approach or in continuous counter current bubble column manner, using stabilizers and the methyl lactate so obtained is recovered and followed by purification of reasonably pure methyl lactate using reagent mixture such as sodium bi-carbonate, mono-ethanolamine or di-ethanolamine, urea or sodium-bicarbonate, mono-ethanolamine or di-ethanolamine, thiourea to reduce the impurity of dimethyl ester of dicarboxylic such as dimethyl oxalate or di-methyl succinate or methyl ester of mono-carboxylic acid such as methyl pyruvate present as an impurity, so as to get highly pure S-(?)-methyl lactate followed by hydrolyzing highly pure S-(?)-methyl lactate using highly pure lactiType: GrantFiled: December 30, 2005Date of Patent: October 26, 2010Assignee: Council of Scientific & Industrial ResearchInventors: Prashant Purushottam Barve, Bhaskar Dattatreya Kulkarni, Sanjay Narayan Nene, Ravindra William Shinde, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi, Gandhali Arun Thite, Vilas Bhiku Chavan, Tushar Ramchandra Deshpande
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Publication number: 20090203937Abstract: The present invention provides a commercially viable process for the preparation of highly pure and optically active L-(+)-lactic acid and S-(?)-methyl lactate, in high yield, obtained from esterification of aqueous crude lactic acid solution produced by sugar cane juice fermentation broth and methanol in continuous counter current trickle phase approach or in continuous counter current bubble column manner, using stabilizers and the methyl lactate so obtained is recovered and followed by purification of reasonably pure methyl lactate using reagent mixture such as sodium bi-carbonate, mono-ethanolamine or di-ethanolamine, urea or sodium-bicarbonate, mono-ethanolamine or di-ethanolamine, thiourea to reduce the impurity of dimethyl ester of dicarboxylic such as dimethyl oxalate or di-methyl succinate or methyl ester of mono-carboxylic acid such as methyl pyruvate present as an impurity, so as to get highly pure S-(?)-methyl lactate followed by hydrolyzing highly pure S-(?)-methyl lactate using highly pure lactiType: ApplicationFiled: December 30, 2005Publication date: August 13, 2009Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCHInventors: Prashant Purushottam Barve, Bhaskar Dattatreya Kulkarni, Sanjay Narayan Nene, Ravindra William Shinde, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi, Gandhali Arun Thite, Vilas Bhiku Chavan, Tushar Ramchandra Deshpande
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Patent number: 7128815Abstract: Process for recovery of highly pure acrylonitrile by quickly vaporizing under vacuum the contaminated acrylonitrile as well as fresh acrylonitrile followed by contacting with hydrophilic agents in an extractive distillation column using plural number of packed sections.Type: GrantFiled: March 25, 2003Date of Patent: October 31, 2006Assignee: Council of Scientific and Industrial ResearchInventors: Prashant Purushottam Barve, Shrikant Madhukar Ghike, Ravindra William Shinde, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi
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Publication number: 20040188236Abstract: Process for recovery of highly pure acrylonitrile by quickly vaporizing under vacuum the contaminated acrylonitrile as well as fresh acrylonitrile followed by contacting with hydrophilic agents in an extractive distillation column using plural number of packed sections.Type: ApplicationFiled: March 25, 2003Publication date: September 30, 2004Inventors: Prashant Purushottam Barve, Shrikant Madhukar Ghike, Ravindra William Shinde, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi
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Patent number: 6660882Abstract: The present invention provides a process for the preparation of highly pure 2-Methyl-2-propene-1-sulfonic acid, sodium salt in high yield, with very low iron content, by the reaction of distilled sulfur trioxide complexed with a Lewis base in a halogentated solvent, the unreacted sulfur trioxide vapors being removed from the reactor before the mixture is treated with liquefied isobutylene, and neutralization by a base with an iron content within the range of 0 to 20 ppm.Type: GrantFiled: March 18, 2002Date of Patent: December 9, 2003Assignee: Council of Scientific and Industrial ResearchInventors: Prashant Purushottam Barve, Sunil Shankar Joshi, Ravindra William Shinde, Shrikant Madhukar Ghike, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi, Raghavendra Venkatrao Naik
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Publication number: 20030176731Abstract: The present invention provides a process for the preparation of highly pure 2-Methyl-2-propene-1-sulfonic acid, sodium salt in high yield, with very low iron content, by the reaction of distilled sulfur trioxide complexed with a Lewis base in a halogentated solvent, the unreacted sulfur trioxide vapors being removed from the reactor before the mixture is treated with liquefied isobutylene, and neutralization by a base with an iron content within the range of 0 to 20 ppm.Type: ApplicationFiled: March 18, 2002Publication date: September 18, 2003Inventors: Prashant Purushottam Barve, Sunil Shankar Joshi, Ravindra William Shinde, Shrikant Madhukar Ghike, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi, Raghavendra Venkatrao Naik
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Patent number: 6504050Abstract: The present invention provides a process for the preparation of highly pure 2-acrylamido-2-methyl-1-propanesulfonic acid in high yield, with improved appearance, by the reaction of acrylonitrile with more than 98% sulfuric acid or oleum and liquefied isobutylene in presence of weak inorganic acids or organic sulfonic acids.Type: GrantFiled: March 13, 2002Date of Patent: January 7, 2003Assignee: Council of Scientific and Industrial ResearchInventors: Prashant Purushottam Barve, Sunil Shankar Joshi, Ravindra William Shinde, Milind Yashwant Gupte, Chandrashekhar Narayan Joshi, Shrikant Madhukar Ghike, Raghavendra Venkatrao Naik, Rajendra Anantrao Kulkarni, Aruna Narayan Bote