Patents Assigned to Societe Elf Atochem S.A.
  • Catalyst for the dehalogenation of .alpha.-halogenated carboxylic acids
    Patent number: 5475135
    Abstract: The invention relates to a catalyst comprising a rare metal of Group VIII of the Periodic Table of Elements which has been deposited on an inert support and which has been used to dehalogenate .alpha.-halogenated carboxylic acids in the presence of hydrogen, and a rare metal of Group VIII of the Periodic Table of Elements which has been deposited on an inert support and which is such that the granulometry of b) is very much lower than that of a) to form a homogeneous mixture as a result of the action of currents of .alpha.-halogenated carboxylic acid and hydrogen wherein said invention is particularly useful for regenerating palladium catalyst used in the purification of crude monochloroacetic acid.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: December 12, 1995
    Assignee: Societe Elf Atochem S.A.
    Inventors: Yves Correia, Dominique Jourdain, Joseph Nowocien, Alexandre Salerno
  • Catalyst for the dehalogenation of alphahalogenated carboxylic acids and its use for purifying monochloroacetic acid
    Patent number: 5466650
    Abstract: The invention relates to a catalyst formed of an active charcoal support in the form of particles or of cylinders having a diameter from 0.3 to 1.5 mm and a length of 0.3 to 5 mm or spheres having a diameter from 0.3 to 2 mm, the said particles being loaded with a precious metal from group 8. Advantageously, palladium on active charcoal is used.The invention is particularly useful for purifying monochloroacetic acid.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: November 14, 1995
    Assignee: Societe Elf Atochem S.A.
    Inventor: Yves Correia
  • Catalyst for the dehalogenation of alphahalogenated carboxylic acids and its use for purifying monochloroacetic acid
    Patent number: 5414116
    Abstract: The invention relates to a catalyst formed of an active charcoal support in the form of particles or of cylinders having a diameter from 0.3 to 1.5 mm and a length of 0.3 to 5 mm or spheres having a diameter from 0.3 to 2 mm, the said particles being loaded with a precious metal from group 8. Advantageously, palladium on active charcoal is used.The invention is particularly useful for purifying monochloroacetic acid.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: May 9, 1995
    Assignee: Societe Elf Atochem S.A.
    Inventor: Yves Correia
  • Catalyst for the dehalogenation of .alpha.-halogenated carboxylic acids
    Patent number: 5356850
    Abstract: The invention relates to a catalyst comprising a rare metal of Group VIII of the Periodic Table of Elements which has been deposited on an inert support and which has been used to dehalogenate .alpha.-halogenated carboxylic acids in the presence of hydrogen, and a rare metal of Group VIII of the Periodic Table of Elements which has been deposited on an inert support and which is such that the granulometry of b) is very much lower than that of a) to form a homogeneous mixture as a result of the action of currents of .alpha.-halogenated carboxylic acid and hydrogen.It is particularly useful for regenerating palladium catalysts used in the purification of crude monochloroacetic acid.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: October 18, 1994
    Assignee: Societe Elf Atochem S.A.
    Inventors: Yves Correia, Dominique Jourdain, Joseph Nowocien, Alexandre Salerno