Patents by Inventor Mulkey C. Wilkes

Mulkey C. Wilkes has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Reclamation of spent glycol by treatment with alkali metal hydroxide and distillation
    Patent number: 4225394
    Abstract: Ethylene glycol is recovered from spent glycol containing impurities, such as dimethyl terephthalate, by subjecting the spent glycol to a sequential flash evaporation-distillation or distillation-flash evaporation-distillation procedure. Dimethyl terephthalate impurities are rendered non-volatile by the addition of a small amount of alkali metal hydroxide prior to flash evaporation. Dewatering of spent glycol and separation of ethylene glycol from impurities rendered non-volatile by alkali metal hydroxide is also performed in one or two distillation steps. Sufficient ethylene glycol is recovered to make use of flash evaporation an optional step.
    Type: Grant
    Filed: April 14, 1976
    Date of Patent: September 30, 1980
    Assignee: PPG Industries, Inc.
    Inventors: Jerry W. Cox, Mulkey C. Wilkes