Patents Assigned to Elf Acquitaine Exploration Production
  • Stabilization of thioacetic acid
    Patent number: 6011173
    Abstract: To avoid the degradation of thioacetic acid on storage, from 0.005 to 0.5% of a chloroacetic acid, preferably dichloroacetic acid, is added thereto.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: January 4, 2000
    Assignee: Elf Acquitaine Exploration Production
    Inventors: Yves Labat, Bernard Monguillon
  • Process for the synthesis of 3-mercaptopropionic acid esters
    Patent number: 5919971
    Abstract: This process for the synthesis of 3-mercaptopropionic acid esters by addition reaction of H.sub.2 S to the corresponding acrylic acid ester is carried out in the presence of a solid-support functionalized with basic guanidine functional groups, on condition that these groups are free of hydrogen that is directly attached to a nitrogen atom.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: July 6, 1999
    Assignee: Elf Acquitaine Exploration Production France
    Inventor: Emmanuel Arretz
  • Process for the synthesis of 3-mercaptopropionic acid
    Patent number: 5877349
    Abstract: This process for the synthesis of 3-mercaptopropionic acid by an addition reaction of H.sub.2 S with acrylic acid is carried out in the presence of a solid support having basic guanidine functional groups, provided that the latter do not contain hydrogen bonded directly to a nitrogen atom.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: March 2, 1999
    Assignee: Elf Acquitaine Exploration Production France
    Inventor: Emmanuel Arretz