| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for introducing multicomponent liquid raw material flow of pressure to a distillation column which is operated at the lower pressure than that of the material flow. SOLUTION: The method for introducing multicomponent liquid supply raw material to a distillation column comprises the steps of taking out a split flow 12 from a raw material flow 10, pressure reducing it, and subcooling the flow 10 by using the obtained flow 13. The method further comprises the steps of pressure reducing the material flow after subcoolilng, and supplying both the flows 14, 16 to the different 6 stag of the distillation column C1. In this case, the multicomponent liquid flow is in a standard two column type air separating cycle of rough liquid oxygen flow from the bottom of a high pressure column which must be pressure reduced before it is introduced to the column of lower pressure.
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