Patents by Inventor William J. Rievert

William J. Rievert 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).

  • Publication number: 20030013929
    Abstract: The present invention relates to a catalytic process for the preparation of alkylene glycols from alkylene oxide and water. Further, the invention relates to a method of preservation of catalysts in alkylene oxide containing systems. More in particular, it has been found that particular acids have a positive effect on the lifetime of catalyst systems based on anion exchange resins, and particularly those in the bicarbonate form.
    Type: Application
    Filed: April 9, 2002
    Publication date: January 16, 2003
    Inventors: Gary R. Strickler, Guo-Shuh J. Lee, William J. Rievert, Daniel J. LaPrairie, Edward E. Timm
  • Patent number: 6479715
    Abstract: The present invention relates to a catalytic process for the preparation of alkylene glycols from alkylene oxide and water. Further, the invention relates to a method of preservation of catalysts in alkylene oxide containing systems. More in particular, it has been found that particular acids have a positive effect on the lifetime of catalyst systems based on anion exchange resins, and particularly those in the bicarbonate form.
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: November 12, 2002
    Assignee: Dow Global Technologies Inc.
    Inventors: Gary R. Strickler, Guo-Shuh J. Lee, William J. Rievert, Daniel J. LaPrairie, Edward E. Timm
  • Patent number: 6448456
    Abstract: The present invention relates to a catalytic process for the preparation of alkylene glycols from alkylene oxide and water. Further, the invention relates to a method of preservation of catalysts in alkylene oxide containing systems. More in particular, it has been found that polycarboxylic acids, preferably oxalic acid, have a positive effect on the lifetime of catalyst systems based on anion exchange resins, and particularly those in the bicarbonate and oxalate forms.
    Type: Grant
    Filed: March 11, 2002
    Date of Patent: September 10, 2002
    Assignee: The Dow Chemical Company
    Inventors: Gary R. Strickler, Guo-Shuh J. Lee, William J. Rievert, Daniel J. LaPrairie, Edward E. Timm
  • Patent number: 6160187
    Abstract: A method for making glycol in an adiabatic reactor system including feeding water and an epoxide into at least one adiabatic reactor under conditions such that epoxide and the water react to form a glycol product stream. The adiabatic reactor contains a catalyst bed which undergoes swelling during its useful lifetime, and the adiabatic reactor operates under conditions sufficient to reduce the rate of catalyst swelling relative to a non-adiabatic reactor system. Other aspects of the invention include the combination of splitting the feed between multiple adiabatic reactors in combination with the cross exchange of heat between feeds and products with heat exchangers, such that an energy efficient process that provides long catalyst stability and minimal catalyst swelling results.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: December 12, 2000
    Assignee: The Dow Chemical Company
    Inventors: Gary R. Strickler, Von G. Landon, Guo-shuh John Lee, William J. Rievert
  • Patent number: 6137015
    Abstract: A process for preparing alkylene glycols including reacting an alkylene oxide with water in the presence of a combination of additives and an anion exchange resin, wherein the combination of additives comprises carbon dioxide and an organic or inorganic base provided in an amount sufficient to maintain a pH of the reaction mixture between about 5.0 and 9.0, with the proviso that, when the base is bicarbonate or carbonate, then the anion exchange resin is a trimethyl benzyl ammonium anion exchange resin. A particularly preferred method of this invention is to react ethylene oxide with water in the presence of a halogenate or bicarbonate-type anionic exchange resin (such as a DOWEX.TM. MSA-1 type resin), carbon dioxide, and sodium hydroxide. Some advantages of this invention are that it provides desirable catalyst lifetime and activity, minimizes resin swelling, and provides a desirable, sustained selectivity to alkylene glycol.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: October 24, 2000
    Assignee: The Dow Chemical Company
    Inventors: Gary R. Strickler, Von G. Landon, Guo-shuh John Lee, William J. Rievert