Purification Or Recovery Patents (Class 568/682)
  • Method of synthesizing fluoromethylhexafluoroisopropyl ether
    Patent number: 4250334
    Abstract: A method of synthesizing fluoromethylhexafluoroisopropyl ether comprises adding hexafluoroisopropyl alcohol to a mixture comprising a stoichiometric excess of paraformaldehyde and hydrogen fluoride, plus sufficient sulfuric acid to sequester most of the water produced by the reaction. The mixture is maintained at a temperature of at least 57.degree. C., to cause vapor formation by boiling of the fluoromethylhexafluoroisopropyl ether formed. The vapor is then collected and condensed, and may be purified by distillation.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: February 10, 1981
    Assignee: Baxter Travenol Laboratories, Inc.
    Inventors: Clifford L. Coon, Robert L. Simon
  • Control of halomethyl ether emissions
    Patent number: 4130629
    Abstract: Emissions of halomethyl ethers are controlled by contacting a gaseous effluent stream containing said ethers with a scrubbing solution comprising an alkali metal hydroxide, a lower dialkanolamine and a lower alkylene glycol.
    Type: Grant
    Filed: December 16, 1977
    Date of Patent: December 19, 1978
    Assignee: FMC Corporation
    Inventors: Joseph J. Velenovsky, Manuel Alvarez