| 摘要 |
A distillation column for separating atmospheric gases in which structured packing having varying crimp angles is utilized within at least two sections or subsections of a single section of a distillation column. In the case of the use of structured packing in multiple sections, the crimp angle of the structured packing used in the first section is greater than that of the second section and is selected such that both sections operate at the same maximum design percentage of flooding limit. The increased crimp angle of the first section decreases the HETP of the packing and thereby allows a column design of reduced height. Structured packing having different crimp angles can be used in a single section of a column when such section is subjected to possible variation of vapor rate. Here the crimp angles are again manipulated so that the subsections operate at the same maximum design percentage of flooding limit. The foregoing adaptation improves turndown performance.
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