METHOD FOR PURIFYING NATURAL GAS BY ADSORPTION AND DISPLACEMENT OF MERCAPTANS

摘要

The invention relates to a method for purifying a natural gas, that comprises the following steps: a) purifying said gas by adsorption of the light mercaptans by contact with an adsorbing material; b) mixing a gaseous effluent with a hydrocarbon-displacement gas; c) feeding the mixture obtained in step b) through the mercaptan-loaded adsorbing material, the amount of displacement agent fed into the adsorbing material being lower than or equal to 50 mass % of the displacement-agent maximum adsorption capacity on the adsorbing material; d) carrying out a thermal desorption, using a purge gas, of the hydrocarbon-displacement agent fed during step c); e) cooling down the adsorbing material using another gaseous effluent or directly using the gas to be purified.