Patents by Inventor Vinay Medhekar
Vinay Medhekar 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).
-
Patent number: 11406966Abstract: The present invention relates to heterogeneous catalysts and methods of making and using the same. In various embodiments, the present invention provides a method of making a hydrogenation catalyst including particulate nickel metal (Ni(0)). The method includes calcining first nickel(II)-containing particles in an atmosphere including oxidizing constituents to generate second nickel(II)-containing particles. The method also includes reducing the second nickel(II)-containing particles in a reducing atmosphere while rotating or turning the second nickel(II)-containing particles at about 275° C. to about 360° C. for a time sufficient to generate the particulate nickel metal (Ni(0)), wherein the particulate nickel metal (Ni(0)) is free flowing.Type: GrantFiled: April 19, 2017Date of Patent: August 9, 2022Assignee: INV Nylon Chemicals Americas, LLCInventor: Vinay Medhekar
-
Publication number: 20210187484Abstract: The present invention relates to heterogeneous catalysts and methods of making and using the same. In various embodiments, the present invention provides a method of making a hydrogenation catalyst including particulate nickel metal (Ni(0)). The method includes calcining first nickel(II)-containing particles in an atmosphere including oxidizing constituents to generate second nickel(II)-containing particles. The method also includes reducing the second nickel(II)-containing particles in a reducing atmosphere while rotating or turning the second nickel(II)-containing particles at about 275° C. to about 360° C. for a time sufficient to generate the particulate nickel metal (Ni(0)), wherein the particulate nickel metal (Ni(0)) is free flowing.Type: ApplicationFiled: April 19, 2017Publication date: June 24, 2021Applicant: INVISTA NORTH AMERICA S.A.R.L.Inventor: Vinay MEDHEKAR
-
Patent number: 10537885Abstract: Methods are described herein that involve rotating or gently mixing nickel(II)-containing particles in a reaction vessel while heating the particles and flowing a reducing atmosphere through the reaction vessel for a time sufficient to generate free-flowing nickel metal (Ni(0)) from the nickel(II)-containing particles.Type: GrantFiled: July 1, 2015Date of Patent: January 21, 2020Assignee: INVISTA North America S.a.r.l.Inventor: Vinay Medhekar
-
Patent number: 10143999Abstract: Disclosed are nickel-containing complexation precursors having high complexation activity for bidentate phosphite ligands. Also disclosed are methods of making the complexation precursors. The disclosed method of generating the nickel-containing complexation precursor includes including contacting a nickel starting material with a reductant under conditions sufficient to generate a nickel-containing complexation precursor having at least about 1,500 ppmw sulfur in the form of sulfide.Type: GrantFiled: November 11, 2015Date of Patent: December 4, 2018Assignee: INVISTA NORTH AMERICA S.A R.L.Inventors: Joan Fraga-Dubreuil, Vinay Medhekar, John A. Turner, Keith Whiston
-
Patent number: 9981257Abstract: As described herein, nickel treated with sulfur provides a surprisingly effective source of nickel atoms for generating nickel-phosphorus-containing ligand complexes useful as hydrocyanation catalysts.Type: GrantFiled: June 6, 2012Date of Patent: May 29, 2018Assignee: INVISTA North America S.a.r.l.Inventors: Joan Fraga-Dubreuil, Vinay Medhekar, Thomas A. Micka, Keith Whiston, John J. Ostermaier, Colin S. Slaten
-
Publication number: 20170333879Abstract: Disclosed are nickel-containing complexation precursors having high complexation activity for bidentate processed under various conditions phosphite ligands. Also disclosed are methods of making the complexation precursors. The disclosed method of generating the nickel-containing complexation precursor includes including contacting a nickel starting material with a reductant under conditions sufficient to generate a nickel-containing complexation precursor having at least about 1,500 ppmw sulfur in the form of sulfide.Type: ApplicationFiled: November 11, 2015Publication date: November 23, 2017Applicant: INVISTA NORTH AMERICA S.A R.L.Inventors: Joan FRAGA-DUBREUIL, Vinay MEDHEKAR, John A. TURNER, Keith WHISTON
-
Publication number: 20170203287Abstract: Methods are described herein that involve rotating or gently mixing nickel(II)-containing particles in a reaction vessel while heating the particles and flowing a reducing atmosphere through the reaction vessel for a time sufficient to generate free-flowing nickel metal (Ni(0)) from the nickel(II)-containing particles.Type: ApplicationFiled: July 1, 2015Publication date: July 20, 2017Applicant: INVISTA North America S.a r.l.Inventor: Vinay MEDHEKAR
-
Patent number: 9687836Abstract: A novel nickel particulate form is provided that efficiently forms a zero-valent nickel complex with a phosphorus-containing ligands in an organic liquid to form a hydrocyanation catalyst. Particles in the nickel particulate form comprise nickel crystallites. For example, the nickel particulate form can have a BET Specific Surface Area of at least about 1 m2/gm; an average crystallite size less than about 20-25 nm, the nickel particulate form can have at least 10% of the crystallites in the nickel form can have can have a diameter (C10) of less than about 10 nm, and/or there are on average at least about 1015 surface crystallites per gram nickel. A ratio of BET SSA to C50 for the nickel particulate form can be at least about 0.1×109 m/gm and preferably at least about 0.4×109 m/gm. Methods of preparation and use are also provided.Type: GrantFiled: March 26, 2015Date of Patent: June 27, 2017Assignee: INVISTA North America S.a r.l.Inventors: Joan Fraga-Dubreuil, Vinay Medhekar, Thomas A. Micka, Keith Whiston
-
Publication number: 20150196900Abstract: A novel nickel particulate form is provided that efficiently forms a zero-valent nickel complex with a phosphorus-containing ligands in an organic liquid to form a hydrocyanation catalyst. Particles in the nickel particulate form comprise nickel crystallites. For example, the nickel particulate form can have a BET Specific Surface Area of at least about 1 m2/gm; an average crystallite size less than about 20-25 nm, the nickel particulate form can have at least 10% of the crystallites in the nickel form can have can have a diameter (C10) of less than about 10 nm, and/or there are on average at least about 1015 surface crystallites per gram nickel. A ratio of BET SSA to C50 for the nickel particulate form can be at least about 0.1×109 m/gm and preferably at least about 0.4×109 m/gm. Methods of preparation and use are also provided.Type: ApplicationFiled: March 26, 2015Publication date: July 16, 2015Applicant: INVISTA North America S.a.r.l.Inventors: Joan FRAGA-DUBREUIL, Vinay MEDHEKAR, Thomas A. MICKA, Keith WHISTON
-
Patent number: 9050591Abstract: A novel nickel particulate form is provided that efficiently forms a zero-valent nickel complex with a phosphorus-containing ligands in an organic liquid to form a hydrocyanation catalyst. Particles in the nickel particulate form comprise nickel crystallites. For example, the nickel particulate form can have a BET Specific Surface Area of at least about 1 m2/gm; an average crystallite size less than about 20-25 nm, the nickel particulate form can have at least 10% of the crystallites in the nickel form can have a diameter (C10) of less than about 10 nm, and/or there are on average at least about 1015 surface crystallites per gram nickel. A ratio of BET SSA to C50 for the nickel particulate form can be at least about 0.1×109 m/gm and preferably at least about 0.4×109 m/gm. Methods of preparation and use are also provided.Type: GrantFiled: June 6, 2012Date of Patent: June 9, 2015Assignee: INVISTA North America S.a.r.l.Inventors: Joan Fraga-Dubreuil, Vinay Medhekar, Thomas A. Micka, Keith Whiston
-
Patent number: 8969606Abstract: These disclosures relate to preparing nickel metal (Ni(0)) suited for use in catalyst systems, such as nickel complexes with phosphorus-containing ligands, useful to catalyze the hydrocyanation of ethylenically unsaturated compounds. The methods described herein can include use of steam during reduction of nickel.Type: GrantFiled: June 6, 2012Date of Patent: March 3, 2015Assignee: INVISTA North America S.a r.l.Inventors: Vinay Medhekar, John J. Ostermaier, Michael C. Quinn, III, Colin S. Slaten
-
Publication number: 20130144079Abstract: These disclosures relate to preparing nickel metal (Ni(0)) suited for use in catalyst systems, such as nickel complexes with phosphorus-containing ligands, useful to catalyze the hydrocyanation of ethylenically unsaturated compounds. The methods described herein can include use of steam during reduction of nickel.Type: ApplicationFiled: June 6, 2012Publication date: June 6, 2013Applicant: INVISTA North America S.a.r.l.Inventors: VINAY MEDHEKAR, John J. Ostermaier, Michael C. Quinn, III, Colin S. Slaten
-
Publication number: 20130144082Abstract: A novel nickel particulate form is provided that efficiently forms a zero-valent nickel complex with a phosphorus-containing ligands in an organic liquid to form a hydrocyanation catalyst. Particles in the nickel particulate form comprise nickel crystallites. For example, the nickel particulate form can have a BET Specific Surface Area of at least about 1 m2/gm; an average crystallite size less than about 20-25 nm, the nickel particulate form can have at least 10% of the crystallites in the nickel form can have can have a diameter (C10) of less than about 10 nm, and/or there are on average at least about 1015 surface crystallites per gram nickel. A ratio of BET SSA to C50 for the nickel particulate form can be at least about 0.1×109 m/gm and preferably at least about 0.4×109 m/gm. Methods of preparation and use are also provided.Type: ApplicationFiled: June 6, 2012Publication date: June 6, 2013Applicant: INVISTA North America S.a r.l.Inventors: Joan Fraga-Dubreuil, Vinay Medhekar, Thomas A. Micka, Keith Whiston
-
Publication number: 20130143730Abstract: As described herein, nickel treated with sulfur provides a surprisingly effective source of nickel atoms for generating nickel-phosphorus-containing ligand complexes useful as hydrocyanation catalysts.Type: ApplicationFiled: June 6, 2012Publication date: June 6, 2013Applicant: INVISTA North America S.a.r.l.Inventors: JOAN FRAGA-DUBREUIL, Vinay Medhekar, Thomas A. Micka, Keith Whiston