Patents by Inventor Thomas E. Vara

Thomas E. Vara 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).

  • Patent number: 4902310
    Abstract: A process is provided for recovering halogenated hydrocarbons from solvent streams, particularly those including water and at least one alcohol, ketone or ester impurity. The process also provides for the recovery of the alcohol, ketone or ester, which can be reused or incinerated. The solvent stream is condensed and initially spearated into a halogenated hydrocarbon rich fraction and a water rich fraction containing the impurities. Impurities are removed from the halogenated hydrocarbon rich fraction in a first separation step, preferably liquid-liquid extraction with water. The impurities are extracted from the halogenated hydrocarbons into the water, which is passed to the water fraction of the initial separation step for further treatment. Halogenated hydrocarbons leaving the extraction column are passed to a distillation column where remaining water and impurities are removed. A continuous halogenated hydrocarbon vapor draw is preferably removed and condensed from the distillation column.
    Type: Grant
    Filed: May 16, 1989
    Date of Patent: February 20, 1990
    Assignee: Vara International, Inc.
    Inventors: Thomas E. Vara, Jerald L. Mestemaker