Purification Or Recovery Patents (Class 568/749)
From mixture of phenols (Class 568/750)
Of polyhydroxy phenol (Class 568/753)
Of phenol prepared by cleavage of hydroperoxide or other peroxide (Class 568/754)
Of halogen containing phenol (Class 568/755)
Of phenol having acyclic polycarbon hydrocarbyl group bonded directly to the benzene ring (Class 568/756)
Nitrogen or phosphorus containing compound utilized (Class 568/757)
Sorbent material utilized (Class 568/758)
From substance which includes sulfur or a sulfur containing compound (Class 568/759)
From ammoniacal liquor (Class 568/760)
From oil or tar derived from fossil fuel or wood (Class 568/761)
  • Process for purifying impure diphenols
    Patent number: 4113974
    Abstract: A process for improving the quality of diphenols by recrystallization from aqueous solvent systems.
    Type: Grant
    Filed: December 30, 1976
    Date of Patent: September 12, 1978
    Assignee: General Electric Company
    Inventors: Victor Mark, Charles Vernon Hedges
  • Production of cyclohexanone
    Patent number: 4092360
    Abstract: In production of cyclohexanone by hydrogenating phenol in the presence of a hydrogenation catalyst, improved catalyst life and improved hydrogenation rate are obtained if ketone impurities, particularly hydroxyacetone, are removed from the phenol prior to the hydrogenation. The present invention provides an improved method for reducing the ketone impurities in the phenol by contacting the phenol with a polyethylenimine and distilling the mixture formed to separate the phenol. The invention is particularly useful in production of cyclohexanone from phenol obtained by decomposition of cumene hydroperoxide.
    Type: Grant
    Filed: May 4, 1977
    Date of Patent: May 30, 1978
    Assignee: Allied Chemical Corporation
    Inventors: Jan F. Van Peppen, William Bernard Fisher