Patents by Inventor Edward J. Shimshick

Edward J. Shimshick 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 organic acids from dilute aqueous solutions of salts of organic acids by supercritical fluids
    Patent number: 4250331
    Abstract: Process for recovering carboxylic acids from dilute aqueous solutions of alkali metal salts of such carboxylic acids by mixing such solutions with from 10 to 1000% of a supercritical solution comprising at least 10 mole % carbon dioxide at a pressure from 80 to 500 atm and preferably 100 to 350 atm and at a temperature of from 35.degree. to 200.degree. C. and preferably from 35.degree. to 100.degree. C. whereby the salt reacts with the carbon dioxide to form the carboxylic acid which dissolves in the supercritical fluid. The aqueous phase is allowed to separate from the supercritical fluid phase. The pressure of the supercritical phase is lowered which lowers the solubility of the carboxylic acid in the supercritical fluid so that an acid phase is formed separate from the supercritical fluid phase whereby recovery of the acid is effected.
    Type: Grant
    Filed: October 9, 1979
    Date of Patent: February 10, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Edward J. Shimshick