Patents Assigned to Citrex S.A.
  • Unsaturated carboxylic salt materials and derivatives thereof
    Patent number: 3997596
    Abstract: A novel sulphonated salt is prepared by pyrolyzing an alkaline-earth metal salt of citric acid until an increase in titratable alkalinity is reached, whereby a novel unsaturated organic salt material is obtained. That salt material is dissolved or suspended and thereafter contacted with a bisulphite ion under acid conditions for producing the sulphonated salt. The corresponding acid of the sulphonated salt may be obtained by hydrolyzing the salt either prior to or subsequent to the sulphonation step.
    Type: Grant
    Filed: November 18, 1975
    Date of Patent: December 14, 1976
    Assignee: Citrex S.A.
    Inventor: Fred Smeets