| 摘要 |
Significant energy saving can be achieved for a distillation column even when the distillation column has a large column temperature difference. Provided is a distillation column including a first (A1) and second columns (A2), wherein the first column (A1) includes a part of a rectifying section or a part of a stripping section; the second column includes, if the first column includes a part of the rectifying section, the rest of the rectifying section (A3) and the whole of the stripping section (A4), or the second column includes, if the first column includes a part ofthe stripping section, the rest ofthe stripping section and the whole ofthe rectifying section; and the second column constitutes a mechanical-heat-pump distillation column (A6, A8). |
