Method and apparatus for production of high-pressure nitrogen from air by cryogenic distillation
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United States of America Patent
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Issued Date -
Jun 5, 2008
app pub date -
Nov 30, 2006
filing date -
Nov 30, 2006
priority date (Note) -
Abandoned
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Abstract
Nitrogen gas at a single pressure is produced from a two-column cryogenic distillation of air. The bottoms liquid product from the high pressure column is divided into two portions, one of which is vaporized and then turboexpanded before its entry into the low pressure column as a feed stream. By these means, no stream bypasses the double distillation process, further enhancing nitrogen recovery and achieving low specific energy consumption for nitrogen product.
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