Patents by Inventor Pravin P. UPARE

Pravin P. UPARE 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).

  • Method for preparing furan derivatives from biomass
    Patent number: 9988362
    Abstract: The present invention relates to a method for preparing for a furan derivative from biomass, comprising step (1) of preparing 5-hydroxymethylfurfural by reacting biomass and a solid acid catalyst in butanol; and step (2) of preparing a furan derivative by reacting the butanol solution of 5-hydroxymethylfurfural, obtained in step (1), with a hydrogenation catalyst.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: June 5, 2018
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Dong Won Hwang, Pravin P. Upare, Jong San Chang, Young Kyu Hwang, U Hwang Lee, Do Young Hong
  • Method for producing lactide directly from lactic acid and a catalyst used therein
    Patent number: 9561492
    Abstract: The present invention provides a method for directly producing lactide by subjecting lactic acid to a dehydration reaction in the presence of a catalyst comprising a tin compound, preferably, a tin (IV) compound, wherein lactide can be produced directly or by one step from lactic acid, without going through the step of producing or separating lactic acid oligomer. The method of the present invention has advantages of causing no loss of lactic acid, having a high conversion ratio to lactic acid and a high selectivity to optically pure lactide, and maintaining a long life time of the catalyst. Further, since lactic acid oligomer is not or hardly generated and the selectivity of meso-lactide is low, the method also has an advantage that the cost for removing or purifying this can be saved.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: February 7, 2017
    Assignee: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY
    Inventors: Dong Won Hwang, Jong-San Chang, Pravin P. Upare, U-Hwang Lee, Young Kyu Hwang
  • Method for producing lactide directly from lactic acid and a catalyst used therein
    Patent number: 9539561
    Abstract: The present invention provides a method for directly producing lactide by subjecting lactic acid to a dehydration reaction in the presence of a catalyst comprising a tin compound, preferably, a tin (IV) compound, wherein lactide can be produced directly or by one step from lactic acid, without going through the step of producing or separating lactic acid oligomer. The method of the present invention has advantages of causing no loss of lactic acid, having a high conversion ratio to lactic acid and a high selectivity to optically pure lactide, and maintaining a long life time of the catalyst. Further, since lactic acid oligomer is not or hardly generated and the selectivity of meso-lactide is low, the method also has an advantage that the cost for removing or purifying this can be saved.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: January 10, 2017
    Assignee: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY
    Inventors: Dong Won Hwang, Jong-San Chang, Pravin P. Upare, U-Hwang Lee, Young Kyu Hwang
  • METHOD FOR PREPARING FURAN DERIVATIVES FROM BIOMASS
    Publication number: 20160304480
    Abstract: The present invention relates to a method for preparing for a furan derivative from biomass, comprising step (1) of preparing 5-hydroxymethylfurfural by reacting biomass and a solid acid catalyst in butanol; and step (2) of preparing a furan derivative by reacting the butanol solution of 5-hydroxymethylfurfural, obtained in step (1), with a hydrogenation catalyst.
    Type: Application
    Filed: April 14, 2016
    Publication date: October 20, 2016
    Inventors: Dong Won HWANG, Pravin P. UPARE, Jong San CHANG, Young Kyu HWANG, U Hwang LEE, Do Young HONG
  • METHOD FOR PRODUCING LACTIDE DIRECTLY FROM LACTIC ACID AND A CATALYST USED THEREIN
    Publication number: 20160016151
    Abstract: The present invention provides a method for directly producing lactide by subjecting lactic acid to a dehydration reaction in the presence of a catalyst comprising a tin compound, preferably, a tin (IV) compound, wherein lactide can be produced directly or by one step from lactic acid, without going through the step of producing or separating lactic acid oligomer. The method of the present invention has advantages of causing no loss of lactic acid, having a high conversion ratio to lactic acid and a high selectivity to optically pure lactide, and maintaining a long life time of the catalyst. Further, since lactic acid oligomer is not or hardly generated and the selectivity of meso-lactide is low, the method also has an advantage that the cost for removing or purifying this can be saved.
    Type: Application
    Filed: September 29, 2015
    Publication date: January 21, 2016
    Inventors: Dong Won HWANG, Jong-San CHANG, Pravin P. UPARE, U-Hwang LEE, Young Kyu HWANG