METHOD OF LOW TEMPERATURE GAS SEPARATION Russian patent published in 2015 - IPC C10G5/06 F25J3/00 

FIELD: oil and gas industry.

SUBSTANCE: method of three-stage low temperature (LT) gas separation means wet gas separation at the first stage with production of the water and HC condensates, and first separation stage gas that is subjected to partial condensation due to counterflow cooling of the gas and condensate of the third separation stage with production of gas and condensate of the second separation stage, as well as heated condensate of the third separation stage and sales gas. Gas of the second separation stage is throttles under conditions of the weathering gas ejection, and is separated with production of gas and condensate of the third separation stage, that are supplied as refrigerants for the partial condensation of the gas of the first stage of separation. Heated condensate of the third stage of separation together with the throttled mixture of HC condensate and condensate of the second separation stage are separated with production of the weathering gas, unstable condensate and water condensate. If necessary, in the gas line of the first and/or the second separation stage the hydrates inhibitor is injected, and spent solution of the hydrates inhibitor is drained from the unit.

EFFECT: increased degree of heavy components recovery and reduced dew point of sales gas.

2 cl, 1 dwg, 1 ex