Patents Assigned to Gerard Kessels Sociedad Anonima, S.A.
  • Method of preparing 2- and 4-hydroxymandelic acid
    Patent number: 6359172
    Abstract: The invention relates to a method of preparing 2- and 4-hydroxymandelic acid by condensing glyoxylic acid with phenol. The glyoxylic acid is reacted with phenol, after which the formed reaction mixture or the phenol, the 2- and 4-hydroxymandelic acid respectively are elution-separated in a column comprising an anion exchange resin, wherein first the excess phenol is separated, followed by the separation of the 4-hydroxymandelic acid and finally the 2-hydroxymandelic acid, both in the form of acid and salt, depending on the eluent used.
    Type: Grant
    Filed: September 15, 1999
    Date of Patent: March 19, 2002
    Assignee: Gerard Kessels Sociedad Anonima, S.A.
    Inventor: Raoul Kessels