Patents by Inventor Yu-Hwa Edward Sheu

Yu-Hwa Edward Sheu 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).

  • Isobutylene-assisted aqueous extraction of methanol from methyl tertiary butyl ether
    Patent number: 6063966
    Abstract: An impure methyl tertiary butyl ether product contaminated with isobutylene, methanol and water is purified by continuous counter-current contact with water and an isobutylene fraction in an extraction zone comprising a counter-current contact tower to provide an overhead raffinate comprising isobutylene, methyl tertiary butyl ether and a minor amount of water and an extract comprising methanol, water and a minor amount of methyl tertiary butyl ether; the overhead raffinate being separated in a methyl tertiary butyl ether purification distillation zone into a lighter distillation fraction comprising isobutylene and water and a heavier distillation fraction consisting essentially of methyl tertiary butyl ether; the lighter distillation fraction being decanted to remove water and to provide a distillate isobutylene fraction that is returned to the contact tower as the isobutylene fraction.
    Type: Grant
    Filed: September 1, 1994
    Date of Patent: May 16, 2000
    Assignee: Huntsman ICI Chemicals LLC
    Inventors: Michael Warren Peters, Yu-Hwa Edward Sheu
  • Isobutylene-assisted aqueous extraction of methanol from methyl tertiary butyl ether
    Patent number: 5659091
    Abstract: An impure methyl tertiary butyl ether product contaminated with isobutylene, methanol and water is purified by continuous counter-current contact with water and an isobutylene fraction in an extraction zone comprising a counter-current contact tower to provide an overhead raffinate comprising isobutylene, methyl tertiary butyl ether and a minor amount of water and an extract comprising methanol, water and a minor amount of methyl tertiary butyl ether; the overhead raffinate being separated in a methyl tertiary butyl ether purification distillation zone into a lighter distillation fraction comprising isobutylene and water and a heavier distillation fraction consisting essentially of methyl tertiary butyl ether; the lighter distillation fraction being decanted to remove water and to provide a distillate isobutylene fraction that is returned to the contact tower as the isobutylene fraction.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: August 19, 1997
    Assignee: Texaco Chemical Inc.
    Inventors: Michael Warren Peters, Yu-Hwa Edward Sheu