Invention Application
- Patent Title: AIR SEPARATION METHOD AND APPARATUS
- Patent Title (中): 空气分离方法和装置
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Application No.: PCT/US2012056503Application Date: 2012-09-21
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Publication No.: WO2013052288A3Publication Date: 2015-09-17
- Inventor: HOWARD HENRY EDWARD
- Applicant: PRAXAIR TECHNOLOGY INC
- Assignee: PRAXAIR TECHNOLOGY INC
- Current Assignee: PRAXAIR TECHNOLOGY INC
- Priority: US201113268117 2011-10-07
- Main IPC: F25J3/00
- IPC: F25J3/00
Abstract:
A cryogenic air separation method and apparatus in which a lower pressure distillation column is configured to receive, at successively higher locations of the lower pressure column and at successively lower temperatures, crude oxygen derived from a crude liquid oxygen stream discharged from a higher pressure column, an intermediate reflux stream and a nitrogen-rich reflux stream. All of the streams are subcooled and depressurized. The subcooling is conducted such that the intermediate reflux stream and the nitrogen-rich liquid stream cocurrently, indirectly exchange heat to a nitrogen-rich vapor stream withdrawn from the lower pressure column and the intermediate reflux stream is subcooled to a temperature between the temperatures over which the nitrogen-rich liquid stream is subcooled. Additionally, the crude liquid oxygen stream and the intermediate reflux stream can, cocurrently, indirectly exchange heat to a pressurized liquid stream used in forming an oxygen product and the nitrogen-rich vapor stream.
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