Patents Assigned to ChemCycles, Inc.
  • Method and apparatus for purifying low grade acetonitrile and other constituents from hazardous waste
    Patent number: 6508917
    Abstract: A method and apparatus for purifying acetonitrile from low grade acetonitriles. Low grade acetonitrile from DNA synthesis, HPLC and pharmaceutical drug manufacturing process wastes which comprise acetonitrile, a first set of impurities having a lower boiling temperature than acetonitrile and a second set of impurities having a boiling temperature greater than acetonitrile are processed to produce a purified acetonitrile by first introducing the low grade acetonitrile into a first distillation column and separating the acetonitrile and first set of impurities from the second set of impurities, the acetonitrile and first set of impurities being drawn as a vapor from the first distillation column, the second set of impurities being produced as the first distillation column bottoms.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: January 21, 2003
    Assignee: ChemCycles, Inc.
    Inventors: Heather K. Miles, Donald H. Westermann, Glenn F. Cunningham
  • Method and apparatus for purifying low grade acetonitrile and other constituents from hazardous waste
    Patent number: 6395142
    Abstract: A method and apparatus for purifying acetonitrile from low grade acetonitriles. Low grade acetonitrile from DNA synthesis, HPLC and pharmaceutical drug manufacturing process wastes which comprise acetonitrile, a first set of impurities having a lower boiling temperature than acetonitrile and a second set of impurities having a boiling temperature greater than acetonitrile are processed to produce a purified acetonitrile by first introducing the low grade acetonitrile into a first distillation column and separating the acetonitrile and first set of impurities from the second set of impurities, the acetonitrile and first set of impurities being drawn as a vapor from the first distillation column, the second set of impurities being produced as the first distillation column bottoms.
    Type: Grant
    Filed: October 14, 1999
    Date of Patent: May 28, 2002
    Assignee: ChemCycles, Inc.
    Inventors: Heather K. Miles, Donald H. Westermann, Glenn F. Cunningham