Patents Represented by Law Firm Miller & Prestin
  • Adsorbent for aromatic hydrocarbon mixture separation
    Patent number: 4069172
    Abstract: An adsorbent for separating para-isomers from C.sub.8 or C.sub.10 aromatic hydrocarbons, specifically, a faujasite zeolite wherein about 2.5 to 25 percent, based on the total exchangeable cation sites originally present within the faujasite zeolite, is decationized and metal ions at the residual cation sites are exchanged substantially with potassium and/or barium ions. The adsorbent is used in separating the para-isomer, which is isolated by desorbing from the adsorbent.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: January 17, 1978
    Assignee: Toray Industries, Inc.
    Inventors: Masazumi Kanaoka, Daisuke Ogawa, Kazuyoshi Iwayama, Makoto Kihara