Patents by Inventor Yaw-Hwa Liu

Yaw-Hwa Liu 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).

  • Removal of Amine Compounds from Carbonylation Process Stream Containing Corrosion Metal Contaminants
    Publication number: 20120283471
    Abstract: A process for removing amine compounds from a process stream derived from a carbonylation process. The amine compounds may be present as iodide salts. The process stream also contains corrosion metal contaminants. The amine compounds are removed by mixing a portion of the process stream a slipstream to form an aqueous stream having a water concentration of greater than 50 wt. %. The aqueous stream is contacted with an exchange resin to remove amine compounds, as well as corrosion metal contaminants.
    Type: Application
    Filed: May 5, 2011
    Publication date: November 8, 2012
    Applicant: CELANESE INTERNATIONAL CORPORATION
    Inventors: G. Paull Torrence, Brian Hokkanen, Yaw-Hwa Liu
  • Process for the electrochemical oxidation of arylketones
    Patent number: 5567299
    Abstract: The present invention provides a process for preparing arylglyoxals which comprise the steps of (a) electrochemically oxidizing an arylketone at a pH of less than about seven and at a temperature of from about -20.degree. C. to about 120.degree. C. in the presence of an electrolyte for a sufficient period of time to form an arylacetal, and (b) subjecting said acetal to hydrolysis for a sufficient period of time and under suitable temperature and pressure conditions to form said arylglyoxal.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: October 22, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Ricardo E. Borjas, Carina Araullo-McAdams, Steven R. Alexander, George A. Blay, Yaw-Hwa Liu
  • Process for the electrochemical oxidation of arylketones
    Patent number: 5500099
    Abstract: The present invention provides a process for preparing arylglyoxals which comprise the steps of (a) electrochemically oxidizing an arylketone at a pH of less than about seven and at a temperature of from about -20.degree. C. to about 120.degree. C. in the presence of an electrolyte for a sufficient period of time to form an arylacetal, and (b) subjecting said acetal to hydrolysis for a sufficient period of time and under suitable temperature and pressure conditions to form said arylglyoxal.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: March 19, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Ricardo E. Borjas, Carina Araullo-McAdams, Steven R. Alexander, George A. Blay, Yaw-Hwa Liu