METHOD OF SEPARATING HYDROCARBON-CONTAINING GAS MIXTURE Russian patent published in 2015 - IPC B01D53/00 

FIELD: chemistry.

SUBSTANCE: method includes the following steps: a) dehydrating the mixture, b) cooling the mixture, c) feeding the mixture through a first fractionation column (7) to obtain a first stream (105) rich in hydrocarbons and a second stream (106) containing hydrocarbons dissolved in CO₂, d) feeding components of the first stream (105) for separation in a revolving gas stream in a nozzle to separate components into a third stream (107) rich in components heavier than methane, and a fourth stream (108) rich in said components, e) heating the third stream (107), f) using one part of the third stream (107) as an output gas (114), g) cooling the other part (115) of the third stream (107) and mixing said part with the first stream (105) and feeding the obtained mixture (117) to step d), h) feeding the second stream (108) and the fourth stream (108) into a second fractionation column (12) to separate a fifth stream (109) rich in C3+ hydrocarbons, a sixth stream (110) rich in CO₂ and a seventh stream (111) rich in methane, i) mixing the seventh stream (111) with the initial gas mixture (101) and feeding components to step (a).

EFFECT: reduced loss of target components and high cost effectiveness of the method.

7 cl, 3 dwg