FIELD: technological processes; gas industry.
SUBSTANCE: invention relates to method of natural gas cleaning from carbon dioxide, methanol and water impurities, during its preparation for extraction of liquefied methane, ethane and light hydrocarbons broad fraction by cryogenic method, and can be used in gas industry enterprises. Method comprises stage of carbon dioxide absorption extraction from natural gas and methanol by amine water solution with subsequent recovery of the latter to produce regenerated absorbent and acid gas, part of which after condensation is returned to regenerator in form of acidic water, and stage of purified natural gas adsorption dehydration with adsorbent regeneration and regeneration gas generation, wherein after removal of carbon dioxide and methanol at the stage of absorption extraction natural gas is mixed with adsorption drying stage regeneration gas, cooled down and subjected to separation from condensed water, and acidic water, containing methanol after absorbent regeneration, is separated in additional rectification column on methanol and stripped water.
EFFECT: invention allows increased energy efficiency, reduced material consumption and production of commercial methanol and gas, prepared to cryogenic separation with extremely low carbon dioxide content.
10 cl, 1 dwg, 1 tbl, 1 ex
