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    • 4. 发明专利
    • SEPARATION OF AIR
    • JPH0694361A
    • 1994-04-05
    • JP15887093
    • 1993-06-29
    • BOC GROUP PLC
    • TOOMASU RASUBOON
    • F25J20060101F25J3/04
    • PURPOSE: To produce a gaseous oxygen product and a nitrogen product under pressures independent from respective production rates by basically rectifying air in a rectification system comprising a higher pressure, an intermediate pressure and a lower pressure rectification columns. CONSTITUTION: Air is rectified through a higher pressure, an intermediate pressure and a lower pressure rectification columns 14, 16, 18. A first reboiler- condenser 20 circulates liquid nitrogen for the higher pressure and the lower pressure rectification columns 14, 18 and reboils the intermediate pressure rectification columns 16. A second reboiler-condenser 53 circulates liquid nitrogen for the intermediate pressure rectification columns 16 and reboils the lower pressure rectification 18. The higher pressure rectification columns 14 is fed with air through respective inlets 12, 26. First oxygen product is withdrawn from the intermediate pressure rectification columns 16 by means of a pump 58. Gaseous nitrogen products are withdrawn from the intermediate and lower pressure rectification columns 16, 18 through a pair of outlets 46, 74 thereof.