Patents Assigned to Elf Aquitaine Exploration
  • Method for pre-sulphurization of catalysts
    Patent number: 6288006
    Abstract: For the presulphurization of catalysts based on metal oxides, intended especially for the hydrotreating of hydrocarbon feedstocks, at least one tertiary mercaptan (for example tert-dodecyl mercaptan) is employed as sulphurizing agent. This tertiary mercaptan can be employed alone or combined with another sulphur-donor compound. The presulphurization according to the invention may be carried out in situ or ex situ.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: September 11, 2001
    Assignee: Elf Aquitaine Exploration Production France
    Inventor: Emmanuel Arretz
  • Process for purification of dimethyl sulphoxide (DMSO)
    Patent number: 6235198
    Abstract: To purify a dimethyl sulphoxide (DMSO), it is placed in contact with a plurality of cation exchange resins at least one of which is a resin of sulphonic type in —SO3H or —SO3NH4 form, it being possible for the other or others to be of chelating type. The DMSO thus obtained has an iron cation content lower than 1 ppb and a sodium cation content lower than 2 ppb.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: May 22, 2001
    Assignee: Elf Aquitaine Exploration
    Inventors: Annie Commarieu, Francis Humblot