Patents Examined by Karl J. Puttutz, Jr.
  • Selective introduction of active sites for hydroxylation of benzene
    Patent number: 5808167
    Abstract: A zeolite catalyst, which can be used in a process for hydroxylating benzene to phenol, is treated with an aqueous solution containing ferric or ferrous ions, and is treated with an aqueous solution containing dithionate ions. The treated catalyst exhibits improved selectivity and stability in the benzene hydroxylation process.
    Type: Grant
    Filed: August 20, 1996
    Date of Patent: September 15, 1998
    Assignee: Solutia Inc.
    Inventor: William D. McGhee