Patents Assigned to Ultraclean Incorporated
  • Process and apparatus for purifying elemental sulfur carried in an aqueous cake
    Patent number: 5049370
    Abstract: A cake containing sulfur and other materials in a base solvent, such as that resulting from a liquid redox hydrogen sulfide removal process, is purified to obtain elemental sulfur by preferential solubilization of the sulfur, employing a selected solvent immiscible with the base solvent at an elevated temperature less than that required to produce a phase change. The base and selected solvents are then separated, and the temperature of the sulfur solvent is lowered to recrystalize elemental sulfur.
    Type: Grant
    Filed: September 26, 1989
    Date of Patent: September 17, 1991
    Assignee: Ultraclean Incorporated
    Inventors: Nobuyasu Hasebe, Jackson Yu