Patents by Inventor Vasant Choudhary

Vasant Choudhary 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).

  • Publication number: 20060120949
    Abstract: A method for improving drastically both the selectivity and yield of hydrogen peroxide in the direct oxidation of hydrogen to hydrogen peroxide over a solid catalyst comprising palladium, which comprises: i) depositing on the solid catalyst at least two halogen containing compounds, one compound essentially comprising bromine and second compound essentially comprising fluorine with the bromine to palladium and fluorine to palladium atom ratios in the range from 0.02 to 20 and from 0.01 to 50, respectively; ii) decomposing the halo compounds deposited on the solid catalyst by calcination at a temperature above 200° C. under inert, reducing or oxidizing gas atmosphere or under vacuum; and iii) contacting the solid catalyst obtained from step (ii) with a gas mixture consisting of hydrogen and oxygen or air or O2 enriched air in an aqueous reaction medium, comprising a mineral acid at the following reaction conditions: concentration of mineral acid in the reaction medium above 0.
    Type: Application
    Filed: June 27, 2005
    Publication date: June 8, 2006
    Inventors: Vasant Choudhary, Chancal Samanta, Prabhas Jana
  • Publication number: 20060093550
    Abstract: This invention discloses a high temperature stable supported non-noble metal catalyst, represented by a general formula: NiCoaCebMgcYdOx(y)/S wherein, S is a low surface area macroporous highly sintered solid support essentially comprising zirconium and hafnium oxides with less than 3 wt % silica and/or alumina and having surface area less than 1.0 m2/g and pore diameter greater than 0.1 micron, in a form of pellet, ring, monolith or granules; Ni, Co, Ce, Mg, Y and O are nickel, cobalt, cerium, magnesium, yttrium and oxygen, respectively; a is Co/Ni mole ratio in the range from 0.01 to 10; b is Ce/Ni mole ratio in the range from 0.001 to 10; c is Mg/Ni mole ratio in the range from 0.001 to 10; d is Y/Ni mole ratio in the range from 0.005 to 5; x is number of oxygen atoms required to fulfil the valance requirement of the metallic elements, NiCoaCebMgcYd; and y is weight percent loading of the active catalyst mass, NiCoaCebMgcYdOx, on the support, S, in the range from 0.
    Type: Application
    Filed: November 1, 2004
    Publication date: May 4, 2006
    Inventors: Vasant Choudhary, Kartick Mondal, Ajit Mamman
  • Patent number: 7022307
    Abstract: The present invention relates to a method for gas-solid contacting in a bubbling fluidized bed reactor by: (a) introducing into a reactor with bed length to bed diameter ratio below about 5.
    Type: Grant
    Filed: December 2, 2003
    Date of Patent: April 4, 2006
    Assignee: Council of Scientific and Industrial Research
    Inventors: Vasant Ramchandra Choudhary, Tushar Vasant Choudhary
  • Publication number: 20060002846
    Abstract: The present invention discloses a process for the production of hydrogen peroxide from hydrazine hydrate or hydrazine salt, represented by a general formula: N2H4.nX, wherein, X is H2O, H2SO4, HNO3, HCl, HBr, HI or CH3COOH; n is 0.5, 1 or 2; N is nitrogen; H is hydrogen; S is sulfur; Cl is chlorine; Br is bromine; and I is iodine, by its liquid phase oxidation with oxygen, using a solid catalyst comprising palladium but with or without halogen promoter, in an aqueous reaction medium with or without comprising a mineral acid and/or halide anions, which comprises: i) contacting the solid catalyst with a hydrazine hydrate or hydrazine salt and oxygen containing gas selected from oxygen, air and oxygen enriched air, in aqueous reaction medium at the following reaction conditions: the concentration of hydrazine hydrate or hydrazine salt in the reaction medium above 0.
    Type: Application
    Filed: June 30, 2004
    Publication date: January 5, 2006
    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
    Inventors: Vasant Choudhary, Chanchal Samanta, Prabhas Jana
  • Publication number: 20050227863
    Abstract: A solid catalyst, consisting of partially halogenated metal oxide or mixed metal oxide or zeolite or zeolite-like solid, represented by a general formula: X(a)/PbMOc(OH)d wherein, X is halogen element selected from F, Cl, Br and I; P is phosphorous element; M is at least one metallic element selected from alkaline earth metals, rare earth metals, group IIIa metals, non-noble transition metals, Sn, Sb, Bi, Si, thorium and uranium; O is oxygen; H is hydrogen; a is the concentration of halogen element X present in the catalyst in the range from 0.01 wt % to 50 wt %; b is the mole ratio of P to M in the range from zero to 1.0; c and d are the number of oxygen and OH groups, respectively, required to satisfy the valence requirement of the metallic and non-metallic elements (M and P); and the ratio of d to c in the range from zero to about 1.0, with or without any catalyst support, useful for the Friedel-Crafts reactions and also its method of preparation are disclosed.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 13, 2005
    Inventors: Vasant Choudhary, Rani Jha
  • Publication number: 20050222465
    Abstract: This invention particularly relates to a process for the acylation of aromatic compounds by an acylating agent for preparing corresponding acylated aromatic compounds, using a solid catalyst.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 6, 2005
    Inventors: Vasant Choudhary, Rani Jha
  • Publication number: 20050113586
    Abstract: The present invention relates to a biphasic process for the epoxidation of an organic compound by organic compound by organic hydroperoxide. More particularly, the present invention relates to a biphasic process for the epoxidation of an organic compound by organic hydroperoxide to the corresponding epoxide, using chromate or dichromate anions as the catalyst in aqueous medium.
    Type: Application
    Filed: November 26, 2003
    Publication date: May 26, 2005
    Inventors: Vasant Choudhary, Nilesh Patil
  • Patent number: 6894183
    Abstract: The present invention relates to a method for gas-solid contacting in a bubbling fluidized bed reactor by: (a) introducing into a reactor with bed length to bed diameter ratio below about 5.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: May 17, 2005
    Assignee: Council of Scientific and Industrial Research
    Inventors: Vasant Ramachandra Choudhary, Tushar Vasant Choudhary
  • Publication number: 20050065355
    Abstract: The present invention relates to a process for the liquid phase epoxidation of a normally liquid olefinic compound to corresponding organic epoxide compound using aqueous or anhydrous organic hydroperoxide as an oxidizing agent in the presence of a supported nano-gold catalysts at the effective organic hydroperoxide/olefinic compound mole ratio, catalyst/olefinic compound weight ratio and temperature to yield the epoxide.
    Type: Application
    Filed: September 22, 2003
    Publication date: March 24, 2005
    Inventors: Vasant Choudhary, Nilesh Patil, Balu Uphade, Prabhas Jana
  • Publication number: 20040122116
    Abstract: The present invention relates to a method for gas-solid contacting in a bubbling fluidized bed reactor by:
    Type: Application
    Filed: December 2, 2003
    Publication date: June 24, 2004
    Applicant: COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
    Inventors: Vasant Ramchandra Choudhary, Tushar Vasant Choudhary
  • Publication number: 20020179489
    Abstract: The present invention relates to a method for gas-solid contacting in a bubbling fluidized bed reactor by:
    Type: Application
    Filed: March 26, 2001
    Publication date: December 5, 2002
    Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
    Inventors: Vasant Ramchandra Choudhary, Tushar Vasant Choudhary