FEED NATURAL GAS TREATMENT METHOD TO PRODUCE TREATED NATURAL GAS AND HYDROCARBON FRACTION C  AND THE RESPECTIVE UNIT Russian patent published in 2014 - IPC B01D53/00 F25J3/06 C10G5/06 C10L3/10 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to feed dried natural gas treatment method, which includes introduction of feed flow (54) to the first separating tank (22), dynamic expansion of the gas flow (56) exiting the tank (22) in the turbine (24), and its further introduction to the first cleaning column (26). The method includes receipt in the upper part of the first column (26) of clean gas (70) and recovery in the lower part of the first column (26) of the lower liquefied gas flow (74), which is introduced upon expansion to the second column (30) to remove hydrocarbons C₅ ⁺. The upper flow of the clean natural gas (70) exiting the first column (26) is delivered to the heat exchanger (20) directly and heated in the first heat exchanger (20) by heat exchange with feed gas (12) only. The method includes compression of gas flow (86) from the upper part of the second column (30) in a compressor (38) before it is introduced to the second separating tank (40). The invention is also related to the unit for treatment of feed dried natural gas.

EFFECT: treatment of feed natural gas in order to remove hydrocarbons C₅ ⁺ from it for the purpose of its further liquefaction.

16 cl, 3 dwg, 10 tbl