Patents by Inventor Sudhir Aki

Sudhir Aki 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: 10087201
    Abstract: A process of hydrolyzing a monodentate, bidentate or tridentate phosphorus-based phosphite ester ligand or ligand blend for a transition metal catalyst comprising contacting the ligand or ligand blend with a hydrolysis catalyst of the formula (R11X11)nP(OH)3-n where n is 0, 1 or 2 wherein the ligand or ligand blend comprises one or more of (i) a bidentate biphosphite ligand of formula (III), (R12—X12)(R13—X13)P—X14—Y—X24—P(X22—R22)(X23—R23), (ii) a tridentate triphosphite ligand of formula (IIIA) (R12—X12)(R13—X13)P—X14—Y—X32—P(X34—R34)—(X33—Y2—K24—P(X23—R23)—(X22—R22) or (iii) a monodentate phosphite ligand of formula (IV) P(X1—R1)(X2—R2)(X3—R3) where each X is oxygen or a bond and each Y is an optionally substituted C6-C20 arylene, followed by separation of the ligand hydrolysis products.
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: October 2, 2018
    Assignee: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Sudhir Aki, Thomas E. Vos
  • Patent number: 9834505
    Abstract: A process of stabilizing a bidentate or tridentate phosphorus-based phosphite ester ligand or mixture thereof in a hydrocyanation reaction milieu comprising water, wherein the ligand or ligand mixture comprises one or more of (i) a bidentate biphosphite ligand of formula (III), (R12—X12) (R13—X13) P—X14—Y—X24—P(X22—R22) (X23—R23) or (ii) a tridentate triphosphite ligand of formula (IIIA) (R12—X12) (R13—X13) P—X14—Y—X32—P(X34—R34)—(X33—Y2—R24—P(X23—R23)—(X22—R22) where each X is oxygen or a bond and each Y is an optionally substituted C6-C20 arylene group, comprising admixing the bidentate and/or tridentate with a stabilizing amount of one or more monodentate phosphite ligand of formula P(X1—R1)(X2—R2)(X3—R3) where each X is oxygen or a bond, wherein the monodentate ligand has a rate of hydrolysis greater than the rate of hydrolysis of the bidentate or tridentate ligand in the presence of water in a hydrocyanation reaction milieu, and thereby preserve concentrations and proportions of the bidentate and/or trid
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: December 5, 2017
    Assignee: INVISTA NORTH AMERICA S.A.R.L.
    Inventors: Sudhir Aki, William J. Tenn, III, Thomas E. Vos
  • Publication number: 20150166583
    Abstract: A method of stabilizing a phosphorus-based ligand or a ligand blend comprising a plurality of phosphorus-based ligands, wherein the ligand or ligand blend comprises one or more of (i) a bidentate biphosphite ligand of formula (III), (R12—X12) (R13—X13)P—X14—Y—X24—P (X22—R22) (X23—R23) (ii) a tridentate triphosphite ligand of formula (IIIA) (R12—X12) (R13—X13)P—X14—Y—X32—P(X34—R34)—(X33—Y2—R24—P(X23—R23)—(X22—R22) or (iii) a monodentate phosphite ligand of formula (IV) P(X1—R1)(X2—R2)(X3—R3) where each X is oxygen or a bond and each Y is optionally substituted C6-C20 arylene; the process comprising forming a mixture of the ligand or the ligand blend with a liquid which partially or fully solubilizes the ligand or ligand blend, the liquid consisting essentially of one or more of: (a) a solvent system that does not contain peroxidizable species; or, (b) a solvent system that is substantially free of a dissolved metal.
    Type: Application
    Filed: May 24, 2013
    Publication date: June 18, 2015
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Sudhir Aki, Thomas E. Vos
  • Publication number: 20150158812
    Abstract: A process of stabilizing a bidentate or tridentate phosphorus-based phosphite ester ligand or mixture thereof in a hydrocyanation reaction milieu comprising water, wherein the ligand or ligand mixture comprises one or more of (i) a bidentate biphosphite ligand of formula (III), (R12—X12) (R13—X13) P—X14—Y—X24—P(X22—R22) (X23—R23) or (ii) a tridentate triphosphite ligand of formula (IIIA) (R12—X12) (R13—X13) P—X14—Y—X32—P(X34—R34)—(X33—Y2—R24—P(X23—R23)—(X22—R22) where each X is oxygen or a bond and each Y is an optionally substituted C6-C20 arylene group, comprising admixing the bidentate and/or tridentate with a stabilizing amount of one or more monodentate phosphite ligand of formula P(X1—R1)(X2—R2)(X3—R3) where each X is oxygen or a bond, wherein the monodentate ligand has a rate of hydrolysis greater than the rate of hydrolysis of the bidentate or tridentate ligand in the presence of water in a hydrocyanation reaction milieu, and thereby preserve concentrations and proportions of the bidentate and/or trid
    Type: Application
    Filed: May 24, 2013
    Publication date: June 11, 2015
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Sudhir Aki, William J. Tenn, III, Thomas E. Vos
  • Publication number: 20150158892
    Abstract: A process of hydrolyzing a monodentate, bidentate or tridentate phosphorus-based phosphite ester ligand or ligand blend for a transition metal catalyst comprising contacting the ligand or ligand blend with a hydrolysis catalyst of the formula (R11X11)nP(OH)3-n where n is 0, 1 or 2 wherein the ligand or ligand blend comprises one or more of (i) a bidentate biphosphite ligand of formula (III), (R12—X12)(R13—X13)P—X14—Y—X24—P(X22—R22)(X23—R23), (ii) a tridentate triphosphite ligand of formula (IIIA) (R12—X12)(R13—X13)P—X14—Y—X32—P(X34—R34)—(X33—Y2—K24—P(X23—R23)—(X22—R22) or (iii) a monodentate phosphite ligand of formula (IV) P(X1—R1)(X2—R2)(X3—R3) where each X is oxygen or a bond and each Y is an optionally substituted C6-C20 arylene, followed by separation of the ligand hydrolysis products.
    Type: Application
    Filed: May 24, 2013
    Publication date: June 11, 2015
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Sudhir Aki, Thomas E. Vos
  • Patent number: 9040735
    Abstract: The present invention relates to a process for hydrocyanating 3-pentenenitrile. The process can include feeding 3-pentenenitrile and HCN to a hydrocyanation reaction zone that includes a Lewis acid promoter, nickel, and a phosphorus-containing ligand. In various embodiments, the process can also include controlling water concentration within the hydrocyanation reaction zone sufficient to maintain a high activity of the ligand catalyst complex while recycling at least a portion of the ligand catalyst complex.
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: May 26, 2015
    Assignee: INVISTA North America S.a.r.l.
    Inventors: Sudhir Aki, Wyatte E. Allen, Mark Anstrom, Charles Nelson Campbell, II, Tseng Chao, James E. McIntosh, Larry E. Moerbe, Bruce Edwin Murphree, Mark D. Rogers, William J. Tenn, III, Thomas E. Vos, Michael W. Wensing
  • Publication number: 20140235887
    Abstract: The present invention relates to a process for hydrocyanating 3-pentenenitrile. The process can include feeding 3-pentenenitrile and HCN to a hydrocyanation reaction zone that includes a Lewis acid promoter, nickel, and a phosphorus-containing ligand. In various embodiments, the process can also include controlling water concentration within the hydrocyanation reaction zone sufficient to maintain a high activity of the ligand catalyst complex while recycling at least a portion of the ligand catalyst complex.
    Type: Application
    Filed: October 4, 2012
    Publication date: August 21, 2014
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Sudhir Aki, Wyatte E. Allen, Mark Anstrom, Charles Nelson Campbell, Tseng Chao, James E. Mcintosh, Larry E. Moerbe, Bruce Edwin Murphree, Mark D. Rogers, William J. Tenn, Thomas E. Vos, Michael W. Wensing
  • Publication number: 20130299738
    Abstract: The invention relates to the use of an N2O-containing ionic liquid as a reagent in a chemical reaction, for example as an oxidising agent.
    Type: Application
    Filed: November 18, 2011
    Publication date: November 14, 2013
    Applicant: INVISTA NORTH AMERICA S.A.R.L.
    Inventors: Sudhir Aki, Keith Whiston, Tayeb Belhocine, Kenneth Richard Seddon
  • Patent number: 8088917
    Abstract: The invention relates to an ionic liquid composition and a method for preparing the ionic liquid. The ionic liquid comprises a cation containing the Formula I, as herein disclosed, and wherein: n is 2, R1 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R2 may form a heterocyclic ring, and R2 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R1 may form a heterocyclic ring, and R3 is selected from the group consisting of hydrogen and C1-C12 alkyl, and wherein R1 and R2 are not simultaneously selected from hydrogen.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: January 3, 2012
    Assignee: Invista North America S.A R.L.
    Inventors: Stewart Forsyth, Kenneth R. Seddon, Keith Whiston, Sudhir Aki
  • Publication number: 20100234215
    Abstract: A catalyst composition and a process for using it to decompose nitrous oxide into nitrogen and oxygen are disclosed. The catalyst composition has surface area of about 1 to about 200 m2/g after exposure to a calcination temperature of between about 400° C. and about 900° C., or about 1 to about 100 m2/g after exposure to a calcination temperature of between about 400° C. and about 950° C.
    Type: Application
    Filed: April 13, 2010
    Publication date: September 16, 2010
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Colin S. Slaten, Sudhir Aki
  • Publication number: 20080299028
    Abstract: A catalyst composition and a process for using it to decompose nitrous oxide into nitrogen and oxygen are disclosed. The catalyst composition has surface area of about 1 to about 200 m2/g after exposure to a calcination temperature of between about 400° C. and about 900° C., or about 1 to about 100 m2/g after exposure to a calcination temperature of between about 400° C. and about 950° C.
    Type: Application
    Filed: May 30, 2008
    Publication date: December 4, 2008
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Colin S. Slaten, Sudhir Aki