Patents Represented by Attorney Robet J. Wolff

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  • Process to produce nitrogen using a double column and three reboiler/condensers
    Patent number: 5761927
    Abstract: A process is set forth for the cryogenic distillation of an air feed to produce nitrogen, particularly high pressure nitrogen of ultra high purity (less than 100 parts per billion of oxygen). A key to the present invention is that, in addition to the conventional reboiler/condenser which links the high and low pressure column, the present invention utilizes two additional reboiler/condensers such that the oxygen rich liquid which collects at the bottom of the low pressure column is reboiled at three different pressure levels.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: June 9, 1998
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Rakesh Agrawal, Catherine Catino Latshaw