×

Process for purifying 4, 4'-isopropylidenediphenol

  • US 3,326,986 A
  • Filed: 12/02/1965
  • Issued: 06/20/1967
  • Est. Priority Date: 01/22/1965
  • Status: Expired due to Term
First Claim
Patent Images

1. IN A PROCESS FOR PURIFYING CRUDE 4,4'"'"''"'"'-ISOPROPYLIDENEDIPHENOL PREPARED FROM ACETONE AND PHENL AND WHICH CONTAINS PHENOL AND ISOMERIC DIPHENOLS AND OTHER PHENOLIC IMPURITIES, THE IMPROVEMENT OF MIXING THE CRUDE DIPHENOL WITH WATER, HEATING THE RESULTING MIXTURE TO A TEMPERATURE SUFFICIENT TO MELT ANY CRYSTALS, AGITATING THE RESULTING FLUID MIXTURE, COOLING SID MIXTURE TO A TEMPERATURE AT WHICH A SUBSTANTIAL PORITON OF THE 4,4'"'"''"'"'-ISOPROPYLIDENEDIPHENOL CRYSTALLIZES, AND SEPARATING THE RESULTING CRYSTALS.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×