Assembly for separating gas mixtures in fractionating columns

A device for separating gas mixtures in rectification columns, comprising:

• housed in a jacket of the rectification columns, forming connected in series a head and (N−1) consecutively installed sections, containing contact spaces, whose lower areas are connected with bottoms, containing submerged evaporators, and upper areas are connected with condensers, whose number corresponds to a number of the rectification columns, manufactured in a form of upper and lower tube sheets, collectors, a set of tubes, whose inner surfaces contact with a separable mixture in the rectification columns, and outer surfaces—with a cooling medium in cavities of the cooling medium, which, through gas recuperative heat exchangers, are connected by a line of a working body return flow to a compressor, a submerged heat exchanger and a working body separator with a connecting pipe of a gas phase, wherein the condensers are grouped in blocks of condensers in the sections which have common cavities of the cooling medium and, at least, one of the N installed sections consists of groups of nj (j=1 . . . N) rectification columns connected in parallel.