Patents Assigned to Exxon Mobil Corporation
  • Recovery of aromatic hydrocarbons using lubricating oil conditioned membranes
    Patent number: 6187987
    Abstract: Permselective separation of aromatic hydrocarbons from non-aromatic hydrocarbons in a feed stream is accomplished using improved asymmetric membranes. The preferred membranes are fashioned from a polyimide and conditioned with a lubricating oil. Feed streams containing a mixture of aromatic and non-aromatic hydrocarbons are contacted with the dense active layer side of the polyimide membrane under a pressure and temperature sufficient to selectively permeate the desired aromatic hydrocarbon.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: February 13, 2001
    Assignee: Exxon Mobil Corporation
    Inventors: Arthur A. Chin, Bryan M. Knickerbocker, Jeffrey C. Trewella, Terry R. Waldron, Lloyd S. White