METHOD OF THE LOW-TEMPERATURE SEPARATION OF THE HYDROCARBON GAS Russian patent published in 2006 - IPC C10G5/04 F25J3/02 

FIELD: gas processing industry; methods of separation of the components of the gaseous mixtures.

SUBSTANCE: the invention is pertaining to the field of the gases processing industry, in particular, to the methods of separation of the components of the gaseous mixtures by the low-temperature condensation and rectification for the purpose of production of the helium concentrate, ethane and the wide fraction of the light hydrocarbons, and may be used at the enterprises of the gas-processing industry. The method provides for: the preliminary cooling of the hydrocarbon gas and its partial condensation; separation of the first stage with separation of the liquid phase from the gaseous phase; the subsequent additional cooling and condensation of the gaseous phase; the separation of the second stage for the liquid and the vapor phases; condensation and rectification of the vapor phase in the flash tower, separation of the third stage of the part of the bottoms product of the flash tower for the liquid phase and the vapor phase; demethanization and deethanization of the whole separated liquid phase. At that the hydrocarbon gas is preliminary dressed with the pentane- hexane fraction, and the separation of the third stage is realized in the separator additionally equipped with mass-exchange nozzle, onto which the liquid phase flow is fed from the separator of the first stage. The technical result of the invention consists in provision of the additional extraction of ethane.

EFFECT: the invention ensures additional extraction of ethane.

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