Patents by Inventor Robert M. Sorrell

Robert M. Sorrell 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).

  • Process for the production of carboxylic acid anhydrides
    Patent number: 5298586
    Abstract: The solubility and stability of rhodium catalysts in rhodium-catalysed carbonylation of alkyl esters or alkyl ethers under substantially anhydrous conditions to produce carboxylic acid anhydrides is improved by the use of co-promoters selected from the group:1,3-dialkyl-4-methylimidazolium iodide;1,3-dialkyl-4-ethylimidazolium iodide;1,3-dialkyl-4-n-propylimidazolium iodide;1,3-dialkyl-4-isopropylimidazolium iodide;1,3-dialkyl-4-n-butylimidazolium iodide1,3-dialkyl-4-sec-butylimidazolium iodide1,3-dialkyl-4-tert-butylimidazolium iodide;1,3-dialkyl-2,4,5-trimethylimidazolium iodide and mixtures thereof wherethe alkyl groups are independently C.sub.1 to C.sub.20 alkyl.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: March 29, 1994
    Assignee: BP Chemicals Limited
    Inventors: Robert G. Beevor, Neil A. Greener, David J. Gulliver, Robert M. Sorrell