Patents Examined by Bascomb, Jr., Wilbur
  • Distillation process for recovery of high purity phenol
    Patent number: 5064507
    Abstract: High purity phenol is obtained from cleavage of cumene hydroperoxide by treating the crude phenol product stream in a first treatment zone with an amine, a coarse distillation to obtain an overhead stream comprising phenol, alpha-methyl styrene, cumene, and impurities, and steam distillation of the overhead stream in combination with addition of an amine to the steam distillation column for a second amine treatment step.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: November 12, 1991
    Assignee: Allied-Signal Inc.
    Inventors: Michael S. O'Donnell, Lamberto Crescentini
  • Method for the separation of indole
    Patent number: 4404063
    Abstract: A method for the separation of indole by distilling an indole-containing reaction fluid obtained by the reaction of aniline with ethylene glycol or by the reaction of N-(.beta.-hydroxyethyl)aniline, which comprises bringing the reaction fluid into contact with a basic substance prior to and/or during the distillation. This method can prevent the deterioration of indole during the distillation procedure.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: September 13, 1983
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventor: Tadatoshi Honda