Patents Assigned to Atofino
  • Method for preparing hydrazine hydrate
    Patent number: 6517798
    Abstract: The invention concerns a method for making hydrazine hydrate which consists in hydrolyzing methyl ethyl ketone azine to obtain hydrazine hydrate and methyl ethyl ketone, characterised in that it consists in purging heterocyclic compounds of the pyrazoline family to prevent coloration of the hydrazine hydrate.
    Type: Grant
    Filed: October 31, 2000
    Date of Patent: February 11, 2003
    Assignee: Atofino
    Inventor: Jean-Pierre Schirmann