INTERNAL HEAT-EXCHANGING TYPE DISTILLATION COLUMN

摘要

PROBLEM TO BE SOLVED: To provide an internal heat-exchanging type distillation column provided with a connecting structure which surely supports a pipe of large weight and attaches a lower end part of the tube to a column bottom tubular side plate. SOLUTION: In the connecting structure of a tube 25 to the column bottom tubular side plate, a first connecting tubular base 22 provided with a contacting face 23 with the column bottom tubular side plate 3b is inserted in a through- hole 21 of the column bottom tubular side plate from an upper surface side so that a lower end part thereof projects out of a lower surface side of the column bottom tubular side plate, a second connecting tubular base 26 is fitted into a lower end part outer peripheral side of the first connecting tubular base 22, the first connecting tubular base 22 and the second connecting tubular base 26 are welded at a lower surface side of the column bottom tubular side plate and further the second connecting tubular bed 26 is welded to the column bottom tubular side plate.