氮氩氧三元系统(N2,0.7812;Ar,0.0093;O2,0.2095)最小分离功与氮氧二元系统(N2,0.79;O2,0.21)最小分离功的比值:7 Z7 P. A7 z# ?$ N
(0.7812*ln(1/0.7812)+0.0093*ln(1/0.0093)+0.2095*ln(1/0.2095))/(0.79*ln(1/0.79)+0.21*ln(1/0.21))=1.1
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但氩与氧的沸点太接近,氩氧精馏分离效率很低,实际三元分离(得到氮、氩、氧三种产品)比二元分离(只得到氮和氧两种产品,氩存在于氧气产品中)能耗高15%~20%
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