Patents by Inventor J. Jay Yarnell

J. Jay Yarnell 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).

  • Method for increasing fluosilicic acid recovered from wet process phosphoric acid production
    Patent number: 4762698
    Abstract: A method is disclosed for increasing the fluosilicic acid (FSA) recovered from a wet process phosphoric acid manufacturing process. The filtrate obtained by washing a filter cake is pumped to a stripper and reacted with H.sub.2 SO.sub.4 to converting the dissolved FSA to gaseous SiF.sub.4. A defoamer is added to the acid-filtrate mixture to reduce the foam produced by the reaction and increase the amount of gaseous SiF.sub.4 recovered from the reaction. The gaseous SiF.sub.4 is recovered from the acid-filtrate reaction mixture and converted to FSA for commercial use.
    Type: Grant
    Filed: May 7, 1987
    Date of Patent: August 9, 1988
    Assignee: International Minerals & Chemical Corp.
    Inventors: J. Jay Yarnell, Craig A. Pflaum, Arthur F. Davidson, Harry J. Kuhn