METHOD OF PREPARATION OF HYDROCARBON GAS Russian patent published in 2008 - IPC F25J3/00 

FIELD: oil and gas industry.

SUBSTANCE: method of preparation of hydrocarbon gas refers to methods of preparation of hydrocarbon gas by means of withdrawing water and hydrocarbon condensate from it and can be employed in gas, oil and petrochemical industry and at preparation of hydrocarbon gases to transporting and processing. The method consists in step-by step separation, cooling of gas between steps of separation by means of recuperation and expansion, withdrawal of hydrocarbon condensate of primary steps of separation, its cooling and using as absorbent in a gas flow before the last low-temperature step of separation. Before being used as absorbent, easy-to-boil hydrocarbon components are withdrawn from hydrocarbon condensate and are divided into two streams, the first one is cooled and mixed with expanded low-temperature gas, while the second stream is degassed and/or deethanised together with condensate of the last low-temperature separation; liquid product obtained as a result of deethanisation is used for increasing molecular weight of hydrocarbon condensate in the first stream.

EFFECT: implementation of invention facilitates upgraded efficiency of hydrocarbon gas preparation by means of increased yield of condensing hydrocarbon components C_3+B, it also facilitates reduction of power costs and weight-dimension characteristics of facility for implementation of said method.

6 cl, 1 dwg