Patents Represented by Attorney Stephen Hoynak

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  • Purification of alkylene oxides
    Patent number: 3987065
    Abstract: Monomeric epoxides are purified by mixing with a hydrocarbyl alkali metal. The requisite amount of hydrocarbyl lithium is readily detectable by a change in color of a suitable indicator. The monomeric epoxide so purified can be rapidly and completely polymerized to yield high molecular weight homopolymers or copolymers.
    Type: Grant
    Filed: December 13, 1972
    Date of Patent: October 19, 1976
    Assignee: The Dow Chemical Company
    Inventors: Kent S. Dennis, Edwin C. Steiner
  • Process for recovering palladium
    Patent number: 3961943
    Abstract: The inactive palladium-containing precipitate formed during the reaction of a carboxylic acid and an olefin to form an ester can be reactivated by the addition of a suitable reducing agent to a slurry of the precipitate in the ester.
    Type: Grant
    Filed: April 18, 1975
    Date of Patent: June 8, 1976
    Assignee: The Dow Chemical Company
    Inventor: Joseph G. Schell, Jr.
  • Method of oxydehydrogenation of alkyl aromatic compounds
    Patent number: 3957897
    Abstract: Certain alkaline earth pyrophosphates, such as Ca, Mg, and Sr pyrophosphates are superior catalysts for oxydehydrogenating alkyl aromatic compounds including nitrogen heterocyclics which have at least one C.sub.2 -C.sub.6 alkyl side chain to form derivatives having side chain unsaturation. The alkyl aromatic compound can have 1-2 rings. The process is carried out at 450.degree.-650.degree.C. and a space velocity of 55-2500.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: May 18, 1976
    Assignee: The Dow Chemical Company
    Inventors: G. Edwin Vrieland, Hans R. Friedli
  • Method of recovering HF from mixtures containing C.sub.1 -C.sub.3 halocarbon compounds
    Patent number: 3947558
    Abstract: Hydrogen fluoride can be separated from an organic mixture of fluorinated C.sub.1 -C.sub.3 compounds and recovered for reuse by selectively absorbing the HF in a glycol in which the HF is soluble, but the fluorinated organic compound is substantially insoluble. If desired, HF can be obtained in anhydrous form.
    Type: Grant
    Filed: August 16, 1973
    Date of Patent: March 30, 1976
    Assignee: Dow Chemical (Nederland) B.V.
    Inventor: A. Theodorus van Eijl
  • Catalyst and method of oxydehydrogenation of alkyl aromatic compounds
    Patent number: 3935126
    Abstract: Alkaline earth-nickel phosphates having from about 61% to about 70% phosphate are superior catalysts for oxydehydrogenating alkyl aromatic compounds including nitrogen heterocyclics which have at least one C.sub.2 -C.sub.6 alkyl side chain to form derivatives having side chain unsaturation. The alkyl aromatic compound can have 1-2 rings. The process is carried out at 450.degree.-650.degree.C. and a space velocity of 55-2500.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: January 27, 1976
    Assignee: The Dow Chemical Company
    Inventor: G. Edwin Vrieland
  • Method of oxydehydrogenation of ethyl benzene
    Patent number: 3933932
    Abstract: Lanthanum phosphate, lanthanum pyrophosphate and rare earth phosphates and pyrophosphates containing a major portion of that lanthanum compound are good catalysts for oxydehydrogenating alkyl aromatic compounds, including nitrogen heterocyclics having at least one C.sub.2 -C.sub.6 alkyl side chain to form derivatives having side chain unsaturation. The alkyl aromatic compound can have 1-2 rings. The process is carried out at 450.degree.-640.degree.C. and a space velocity of 55-2500.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: January 20, 1976
    Assignee: The Dow Chemical Company
    Inventors: G. Edwin Vrieland, Hans R. Friedli