COMPLEX DRYING AND CLEANING OF ASSOCIATE OIL GAS BY CENTRIFUGAL SEPARATION AND MEMBRANE FILTRATION FOLLOWED BY VORTEX COMBUSTION Russian patent published in 2015 - IPC F25J1/00 

FIELD: process engineering.

SUBSTANCE: invention relates to cryogenic gas separation of associated oil gases. Process of complex drying and cleaning of associated oil gas comprises gas-dynamic separation and membrane technology of removal of acid compounds. Fed associated oil gas is subjected to two-step drying and cleaning. Main amount of water and heavy hydrocarbon fractions C₅ and higher are removed at multistage primary rotary separator at low pressure of 0.3-0.5 MPa. Then, cleaned light hydrocarbon fraction is compressed to 3.0-6.0 MPa and after-purified in extra rotary separator and, then, subjected to cleaning by membrane process from acid compounds H₂S and CO₂. Cleaned fraction of light hydrocarbons is subjected to vortex power separation in three-flow vortex tube wherefrom produced cold flow is directed for cold recuperation for cooling of initial flow of associated oil gas and discharged as a commercial fraction of C₃-C₄. Separated fraction of vortex tube cold flow is directed for compression recycling with pre-separated light hydrocarbon fraction. Hot vortex tube flow is discharged as the commercial fuel gas.

EFFECT: optimised separation, drying and cleaning.

1 dwg