Patents by Inventor John R. Hurlock

John R. Hurlock 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).

  • Purification of acrylamide via crystallization with centrifugal liquor separation
    Patent number: 4010142
    Abstract: Removal of organic impurities from a dilute solution of aqueous acrylamide is achieved byA. vacuum stripping of the aqueous acrylamide at > 25.degree. to 50.degree. C to concentrate the aqueous solution to about 80% acrylamide;B. cooling to about 25.degree. C to produce a slurry of acrylamide crystals;C. centrifuging the acrylamide crystals to express mother liquor and forming a crystal cake of acrylamide crystals;D. washing the crystal cake with water wash to produce an aqueous rinse liquor; andE. recycling the mother liquor and rinse liquor to vacuum stripping, step (a). The recycling of mother liquor from step (c) and rinse liquor from step (d) is effected n times where n = 4-20.This purifying process serves to remove certain nonvolatile and non-ionic organic impurities from the acrylamide monomer which are principally trieneamide together with small amounts of valeramide-.DELTA.-1:3-diene and .delta.-cyano-valeramide-.DELTA.-ene.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: March 1, 1977
    Assignee: Nalco Chemical Company
    Inventors: John R. Hurlock, Kenneth G. Phillips
  • Method of improving the removal of mother liquor from acrylamide crystals
    Patent number: 3989754
    Abstract: Mother liquor removal from acrylamide crystals is improved by draining such crystals in the presence of a paraffinic hydrocarbon liquid.
    Type: Grant
    Filed: November 19, 1975
    Date of Patent: November 2, 1976
    Assignee: Nalco Chemical Company
    Inventor: John R. Hurlock