Patents by Inventor Elie M. Chemtob

Elie M. Chemtob 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).

  • Process for producing HF from impure phosphoric acids
    Patent number: 4505884
    Abstract: Substantially calcium-free fluoroaluminum phosphate precipitate (which also contains iron) can be produced by the aging of wet process phosphoric acid containing iron, fluorine and aluminum, preferably phosphoric acid analyzing in the range of about 15%-45 weight percent P.sub.2 O.sub.5, 2-4% Al.sub.2 O.sub.3 and 1-2% fluorine. One process involves digestion of phosphate ore matrix in recycled phosphoric acid, filtration to remove the insoluble residue, precipitation and filtration to remove gypsum, and aging of the product acid to precipitate the aluminum impurity as a fluoroaluminum phosphate compound. The fluoroaluminum phosphate can be decomposed (as by heating at about 195.degree. C.) to produce HF and aluminum phosphate.
    Type: Grant
    Filed: May 17, 1982
    Date of Patent: March 19, 1985
    Assignee: Occidental Research Corporation
    Inventors: Elie M. Chemtob, Gary L. Beer
  • Cooling process for selective salt crystallization
    Patent number: 3977835
    Abstract: Salable salt values in a complex brine are recovered by cooling to crystallize mirabilite, then using solar evaporations to recover readily processable groupings of sodium salts and potassium salts.
    Type: Grant
    Filed: December 13, 1974
    Date of Patent: August 31, 1976
    Assignee: Occidental Petroleum Corporation
    Inventors: Elie M. Chemtob, Roland V. Marcote