INTERNAL HEAT-EXCHANGING TYPE DISTILLATION COLUMN

摘要

PROBLEM TO BE SOLVED: To provide an internal heat-exchanging type distillation column in which heat transfer form a concentrating section side to a recovering section side in a distillation column can be efficiently executed. SOLUTION: In the internal heat-exchanging type distillation column in which one distillation column is constituted by varying operation temperature by making operation pressure different from each other while assigning a tube inside 4 to a high pressure side and a tube outside 5 to a low pressure side and executing heat transfer from the tube inside (the concentrating section) 4 of a higher pressure side to the tube outside (the recovering section) 5 of a lower pressure side, engraved lines (grooves) are formed almost horizontally (in a peripheral direction of a plurality of tubes 25) on a surface (recovering section tubular sidewall) 25a on a region (tube outside) side to be the recovering section 5 of the plurality of tubes 25 separating the concentrating section 4 and the recovering section 5. Further the recovering section is made to be a packed column system. Further the engraved lines (grooves) are formed by a sand blasting method, a sand grinding method or a mechanical processing.