Patents by Inventor Constantine Tsonopoulos

Constantine Tsonopoulos 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 glycols from a polyalkylene glycol dialkyl ether solution
    Patent number: 4962238
    Abstract: The removal of a glycol contaminant from a mixture of polyalkylene glycol dialkyl ethers is achieved using a dual solvent extraction process. The process is particularly applicable to removing glycols which accumulate in recirculating solutions of polyalkylene glycol dialkyl ethers used for the absorption of acid gases from feedstocks such as natural gas, synthetic natural gas, refinery gas, and ammonia synthesis gas.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: October 9, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: Ralph G. Wolfe, Dennis P. Maloney, Robert E. Steele, Constantine Tsonopoulos, Eugene R. Thomas
  • High-pressure azeotropic distillation for the manufacture of anhydrous alcohols
    Patent number: 4161429
    Abstract: A unique combination of specially chosen entrainers, e.g., pentanes and cyclohexane, and high-pressure azeotropic distillation conditions, e.g., 100-200 psig., provides an economically efficient separation of a C.sub.2 -C.sub.5 alkyl alcohol, e.g., isopropanol, from its aqueous mixture; and also results in the production of a useable steam having a sufficient pressure, e.g., from 10 psig. to 30 psig. Preferably, said azeotropic distillation is conducted in the substantial absence of oxygen, e.g., less than 1 wppm.
    Type: Grant
    Filed: October 22, 1976
    Date of Patent: July 17, 1979
    Assignee: Exxon Research & Engineering Co.
    Inventors: James J. Baiel, Constantine Tsonopoulos