| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for efficiently separating, by an easy operation, a feed mixture contg. at least three components by distillation. SOLUTION: Two vapor streams 32, 50 are transported from relatively high- pressure spots (from the upper side of a distillation section 1 and from between distillation sections 2 and 6) of a tower 100 for producing a product 90 enriched with the lowest volatile component to a relatively low-pressure spots (to between distillation sections 3 and 4 and to the lower side of a distillation section 5) of another tower; thus, the flow rates of vapors from one tower to another tower are enabled to be greatly easily controlled while the performance of a relatively efficient method of conventional technique is maintained.
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