COMPOSITE METHOD FOR REMOVING HEAVY HYDROCARBONS, AMINE PURIFICATION AND DRYING Russian patent published in 2011 - IPC C10L3/10 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for purifying a raw material stream of crude natural gas comprising the following steps: (1) passing said raw material stream of crude natural gas through an adsorption section containing an adsorbent which selectively removes heavy hydrocarbons and water from said raw material stream of natural gas, and thereby forming a first output stream; (2) bringing said first output stream into contact with aqueous amine absorbent, where the said aqueous amine absorbent removes acidic gases from the said first output stream, thereby forming a product stream of natural gas having lower content of acidic gases than the said first output stream; (3) recirculation of said product stream of natural gas through the said adsorption section containing an adsorbent which selectively removes water; and (4) collection of the product stream of natural gas which contains less amount of water and heavy hydrocarbons than the said stream of crude natural gas. The invention also relates to a system for purifying natural gas.

EFFECT: obtaining a product stream of highly pure natural gas.

8 cl, 3 dwg