FIELD: gas industry.
SUBSTANCE: invention relates to additional extraction of valuable components from natural hydrocarbon gas and can be used in gas-processing industry. Method of complex extraction of valuable admixtures from natural helium-containing hydrocarbon gas with high nitrogen content includes the following stages: first level cleaning crude stream of natural hydrocarbon gas from mechanical impurities and dropping liquid, second level cleaning of the first flow of treated hydrocarbons gas from impurities of hydrogen sulphide, carbon dioxide and methanol, regeneration of the flow of saturated absorbent, stripping of acidic water from methanol, hydrogen sulphide and carbon dioxide, compression and drying of low-pressure acid gases, third level drying, removal of mercury compounds of the second flow of treated hydrocarbons gas, low-temperature separation of the third flow of dried and treated hydrocarbon gas, expansion and cooling of deethanized gas with its partial condensation in a “cold box”, cryogenic denitrating, removal of hydrogen from the nitrogen-helium mix, cryogenic post-treatment of semi-finished product of liquid helium from impurities of nitrogen, oxygen, argon and neon, cryogenic separation of helium, adsorption purification of SGL, fractioning of the purified SGL, preparation of commercial fuel gas, storage of liquid nitrogen and helium in Dewar vessels in the commercial park.
EFFECT: invention allows to ensure preliminary deep drying and cleaning of the initial natural hydrocarbon gas from carbon dioxide, hydrogen sulphide, mercaptan and mercury compounds, to minimize emissions into the environment of acidic wastes and components of the initial natural hydrocarbon gas.
39 cl, 1 dwg, 3 tbl
