Patents by Inventor Rajendra Srivastava

Rajendra Srivastava 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).

  • Process for the preparation of lubricants
    Patent number: 7842653
    Abstract: The present invention provides an improved process for the preparation of lubricants from vegetable oil or fat obtained from animal source. The present invention involves a reaction of vegetable oil or fat with an alcohol in the presence of a double metal cyanide catalyst, at a temperature in the range of 150° to 200° C. for a period of 3-6 hrs to obtain the desired bio-lubricant.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: November 30, 2010
    Assignee: Council of Scientific & Industrial Research
    Inventors: Srinivas Darbha, Rajendra Srivastava, Paul Ratnasamy
  • Transesterification catalyst and a process for the preparation thereof
    Patent number: 7754643
    Abstract: The present invention provides a novel transesterification catalyst having the general formula: Zn3M2(CN)n(ROH).xZnCl2.yH2O wherein R is tertiary-butyl and M is a transition metal ion selected from Fe, Co and Cr, x varies from 0 to 0.5, y varies from 3-5 and n is 10 or 12. The above said catalyst is useful for an efficient transesterification of glycerides, fatty acid esters and cyclic carbonates on reactions with alcohols.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: July 13, 2010
    Assignee: Council of Scientific & Industrial Research
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of dialkyl carbonate
    Patent number: 7518012
    Abstract: The present invention provides a process for the preparation of dialkyl carbonates of general formula (1) wherein R=alkyl (C1-C8) or C6H5CH2 the said process comprises a reaction in between cyclic carbonate and alcohol, in the presence of a solid, double metal cyanide complex catalyst, at a temperature in the range of 140-180° C., for a period of 4-10 hrs, followed by the separation of catalyst from the above said reaction mixture by known methods to obtain the desired product.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: April 14, 2009
    Assignee: Council of Scientific & Industrial Research
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of hydrocarbon fuel
    Patent number: 7482480
    Abstract: The present invention provides a process for the preparation of hydrocarbon fuels, which comprises contacting fatty acid glycerides with alcohols in the presence of a solid, double metal cyanide catalyst at a temperature in the range of 150° to 200° C. for a period of 2-6 hrs and separating the catalyst from the above said reaction mixture to obtain the desired hydrocarbon fuel.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: January 27, 2009
    Assignee: Council of Scientific & Industrial Research
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of carbamates
    Patent number: 7405319
    Abstract: The present invention provides an improved process for the preparation of carbamates with high selectivity of pharmaceutical interest by an eco-friendly, non-toxic, phosgene-/isocyanate-/CO-free clean route through a reaction of amine, organic halide compound and carbon dioxide in the presence of a solid, reusable catalyst at moderate conditions and does not require additional cocatalyst/promoter as well as solvent.
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: July 29, 2008
    Assignee: Council of Scientific and Industrial Research
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Adenine modified silica-based catalyst, a process for the preparation and use there for the production of cyclic carbonates
    Patent number: 7375224
    Abstract: The present invention provides an adenine modified solid, ordered, mesoporous, bifunctional, organo-inorganic silica-based catalyst, its method of preparation and also a process for the production of cyclic carbonates of the formula hereinbelow wherein R?H, CH2Cl, CH3, C4H9, C6H11, C6H5.
    Type: Grant
    Filed: May 23, 2006
    Date of Patent: May 20, 2008
    Assignee: Council of Scientific and Industrial Research
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of cyclic carbonates
    Patent number: 7365214
    Abstract: The present invention provides an improved process for the preparation of cyclic carbonates which comprises reacting an olefins or its epoxide with carbon dioxide or a mixture of oxygen-containing compound and carbon dioxide, in the presence of zeolite-based catalyst and a Lewis base co-catalyst, at a minimum pressure of 30 psig and temperature between 40 to 120° C. for 0.5 to 4 hrs., separating the catalyst and recovering the corresponding cyclic carbonate formed by conventional methods.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: April 29, 2008
    Assignee: Council of Scientific and Industrial Research
    Inventors: Darbha Srinivas, Rajendra Srivastava
  • Adenine modified silica-based catalyst, a process for the preparation and use there for the production of cyclic carbonates
    Publication number: 20070276146
    Abstract: The present invention provides an adenine modified solid, ordered, mesoporous, bifunctional, organo-inorganic silica-based catalyst, its method of preparation and also a process for the production of cyclic carbonates of the formula hereinbelow wherein R?H, CH2Cl, CH3, C4H9, C6H11, C6H5
    Type: Application
    Filed: May 23, 2006
    Publication date: November 29, 2007
    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of carbamates
    Publication number: 20070270605
    Abstract: The present invention provides an improved process for the preparation of carbamates with high selectivity of pharmaceutical interest by an eco-friendly, non-toxic, phosgene-/isocyanate-/CO-free clean route through a reaction of amine, organic halide compound and carbon dioxide in the presence of a solid, reusable catalyst at moderate conditions and does not require additional cocatalyst/promoter as well as solvent
    Type: Application
    Filed: May 22, 2006
    Publication date: November 22, 2007
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Novel transesterification catalyst and a process for the preparation thereof
    Publication number: 20070093380
    Abstract: The present invention provides a novel transesterification catalyst having the general formula: Zn3M2(CN)n(ROH).xZnCl2.yH2O wherein R is tertiary-butyl and M is a transition metal ion selected from Fe, Co and Cr, x varies from 0 to 0.5, y varies from 3-5 and n is 10 or 12. The above said catalyst is useful for an efficient transesterification of glycerides, fatty acid esters and cyclic carbonates on reactions with alcohols.
    Type: Application
    Filed: March 30, 2006
    Publication date: April 26, 2007
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of hydrocarbon fuel
    Publication number: 20070083056
    Abstract: The present invention provides a process for the preparation of hydrocarbon fuels, which comprises contacting fatty acid glycerides with alcohols in the presence of a solid, double metal cyanide catalyst at a temperature in the range of 150° to 200° C. for a period of 2-6 hrs and separating the catalyst from the above said reaction mixture to obtain the desired hydrocarbon fuel.
    Type: Application
    Filed: March 30, 2006
    Publication date: April 12, 2007
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of dialkyl carbonate
    Publication number: 20070083062
    Abstract: The present invention provides a process for the preparation of dialkyl carbonates of general formula (1) wherein R=alkyl (C1-C8) or C6H5CH2 the said process comprises a reaction in between cyclic carbonate and alcohol, in the presence of a solid, double metal cyanide complex catalyst, at a temperature in the range of 140-180° C., for a period of 4-10 hrs, followed by the separation of catalyst from the above said reaction mixture by known methods to obtain the desired product.
    Type: Application
    Filed: March 30, 2006
    Publication date: April 12, 2007
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of lubricants
    Publication number: 20070004599
    Abstract: The present invention provides an improved process for the preparation of lubricants from vegetable oil or fat obtained from animal source. The present invention involves a reaction of vegetable oil or fat with an alcohol in the presence of a double metal cyanide catalyst, at a temperature in the range of 150° to 200° C. for a period of 3-6 hrs to obtain the desired bio-lubricant.
    Type: Application
    Filed: May 26, 2006
    Publication date: January 4, 2007
    Inventors: Srinivas Darbha, Rajendra Srivastava, Paul Ratnasamy
  • Process for preparing cyclic carbonates
    Publication number: 20060094893
    Abstract: The present invention relates to a process for the preparation of cyclic carbonates comprising contacting an epoxide with CO2 in the presence of a titanosilicate catalyst and a base co-catalyst at a temperature above 313 K and a pressure above 2 bar for a period of 0.5 to 8 hrs and isolating the formed cyclic carbonate from the reaction mixture by conventional methods.
    Type: Application
    Filed: October 29, 2004
    Publication date: May 4, 2006
    Inventors: Darbha Srinivas, Rajendra Srivastava, Paul Ratnasamy
  • Process for the preparation of cyclic carbonates
    Publication number: 20050070724
    Abstract: The present invention provides an improved process for the preparation of cyclic carbonates which comprises reacting an olefins or its epoxide with carbon dioxide or a mixture of oxygen-containing compound and carbon dioxide, in the presence of zeolite-based catalyst and a Lewis base co-catalyst, at a minimum pressure of 30 psig and temperature between 40 to 120° C. for 0.5 to 4 hrs., separating the catalyst and recovering the corresponding cyclic carbonate formed by conventional methods.
    Type: Application
    Filed: September 29, 2003
    Publication date: March 31, 2005
    Applicant: Council of Scientific and Industrial Research
    Inventors: Darbha Srinivas, Rajendra Srivastava