Plant for producing gaseous nitrogen
A plant for producing gaseous nitrogen, which plant comprises a heat exchanger for cooling feed air, a distillation column for receiving at least part of said feed air, a vessel, a reflux condenser disposed in said vessel and arranged to receive, in use, vapor from said distillation column and return liquid reflux thereto, a line connecting the lower portion of said distillation column to said vessel and having an expansion valve mounted therein, a line for withdrawing nitrogen product from said distillation column and bringing said nitrogen product into heat exchange with said feed air, a crude liquid oxygen (LOX) storage tank communicating with said vessel, a liquid nitrogen storage tank communicating with said distillation column, a line for conveying waste gas from said vessel, means to warm said waste gas, an expander to expand said waste gas, means to control the flow of waste gas through said expander, and means to effect heat exchange between the expanded waste gas and the feed air.
- Assignee:
- Air Products and Chemicals, Inc.
- Patent Number(s):
- US 4526595
- OSTI ID:
- 6486470
- Country of Publication:
- United States
- Language:
- English
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