Patents Assigned to Shell Development Company
  • Trimethyl 6-oxabicyclo[3.2.1]octan-4-ols and 4-ones
    Patent number: 4536586
    Abstract: A compound of the formula ##STR1## wherein each R is H or alkyl and W is an optionally substituted unsaturated, cycloalkyl, secondary alkyl, aromatic or heterocyclic group, are useful as plant growth regulators and herbicides. The corresponding 6-oxabicyclo[3.2.1]octan-4-ols and 6-oxabicyclo[3.2.1]-octan-4-ones are novel intermediates.
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: August 20, 1985
    Assignee: Shell Development Company
    Inventor: James E. Powell
  • Dissolving barium sulfate scale with aqueous solutions of bicyclic macrocyclic polyethers and organic acid salts
    Patent number: 4215000
    Abstract: Barium sulfate scale is dissolved by contacting it with an aqueous solution of: a bicyclic macrocyclic polyether in which the intramolecular cavity or cript is preferentially receptive to the cations of alkaline earth metals, at least a catalytically effective proportion of an alkali metal salt of an organic acid, and enough dissolved alkaline inorganic alkali metal or ammonium compound to provide a solution pH of at least about 8.
    Type: Grant
    Filed: October 16, 1978
    Date of Patent: July 29, 1980
    Assignee: Shell Development Company
    Inventors: Feike De Jong, David N. Reinhoudt, Gerridina J. Torny-Schutte
  • Purification of propylene polymerization product
    Patent number: 4167619
    Abstract: This invention is directed to an improved method for the work-up of the reaction product from stereospecific polymerization of propylene with Ziegler Type catalysts in a liquid phase polymerization process employing a C.sub.3 reaction medium. The product work-up comprises treatment of the reactor effluent slurry with a small amount of a C.sub.3 or C.sub.4 alkanol and with oxygen or an effective peroxide, followed by washing of the polymer with a C.sub.3 hydrocarbon medium containing a small amount of a C.sub.3 or C.sub.4 alkanol.
    Type: Grant
    Filed: April 21, 1978
    Date of Patent: September 11, 1979
    Assignee: Shell Development Company
    Inventors: Abraham Van Mannekes, Ross T. Channon, Jan W. De Beukelaar
  • Process for reducing the total sulfur content of Claus off-gases
    Patent number: 4012486
    Abstract: The sulfur content of off-gases from processes such as the Claus process is treated by catalytically oxidizing the sulfur compounds to sulfur dioxide. By use of specific catalytic materials, low temperatures of reaction and minimal SO.sub.3 formation are achieved.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: March 15, 1977
    Assignee: Shell Development Company
    Inventor: David M. Singleton
  • Thermal cracking method for the production of ethylene and propylene in a molten metal bath
    Patent number: 4012457
    Abstract: The pyrolysis of hydrocarbons to produce light olefins is accomplished in a reactor-quench system employing a common molten metal medium and forced circulation risers in both the reactor and quench zones.
    Type: Grant
    Filed: October 6, 1975
    Date of Patent: March 15, 1977
    Assignee: Shell Development Company
    Inventors: Larry D. Bredeson, Glenn R. McCullough, Oran L. Wylie