METHOD FOR CRYOGENIC SEPARATION OF NATURAL GAS FLOW Russian patent published in 2020 - IPC F25J3/02 

FIELD: gas industry.

SUBSTANCE: present invention relates to gas industry. Disclosed is a method for cryogenic separation of natural gas feed stream (1) into gas containing the most volatile compounds (14) and to liquid product (18) containing heaviest compounds. Partially condensed feed natural gas stream (1) in first heat exchange system (2). Partially condensed stream (3) is introduced into lower part of absorption column (7). Absorption column (7) forms in the upper part gas flow (11) containing the most volatile compounds, and in the lower part liquid product (10). Liquid product (10) is fed into fractionation column (15) to obtain liquid product fractionation (18) and fractionation column (19) in fractionation column (15) in bottom part (16). Gas phase (23) of condensed distillate (21) is fed into upper part of absorption column (7) as supplied stream (24) of absorption column (7). Gas flow (11) is divided into several flows (11', 11"), at least one (11') of which is used to condense distillate (21) in second heat exchange system (12).

EFFECT: technical result is improved control of upper condenser of fractionation column.

3 cl, 3 dwg