Process for the removal of sour gases from pressurised...

B - Operations – Transporting – 01 – D

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Details

B01D 53/14 (2006.01) C07C 7/11 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2523037

The invention relates to a method for removing acid gas from pressurized natural gas that is contaminated with sulfur compounds. According to said method, - the natural gas (1) that is to be desulfurized is first directed into an acid gas absorption stage (2) where the sulfur components and other optional components are absorbed by means of a physically active solution, - the absorbate is heated (15, 16), - the absorbate is fed into a high pressure flash stage (19) where the obtained mixture of desorbed acid gas and absorbing agent that is low in acid gas separates, - the desorbed acid gas is chilled and the evaporated absorbing agent is condensed (23) out of the acid gas flow, - the pressure in the high pressure flash stage (19) is adjusted to a level at which the desorbed acid gas (24) can be condensed out by means of cooling water or cooling air (26), - the absorbing agent (30) from the high pressure flash stage, which is low in acid gas, is stripped of leftover acid gas by means of stripping gas in a gas stripping stage (13), and the obtained absorbing agent (32) is chilled and is redirected into the acid gas absorption stage (2) in the circuit (39, 41).

L'invention concerne un procédé pour extraire des gaz acides d'un gaz naturel sous pression contaminé par des composés de soufre, ce procédé comprenant les opérations suivantes : faire passer le gaz naturel (1) à désulfurer d'abord à un niveau d'absorption de gaz acides où les composés de soufre ainsi qu'éventuellement d'autres composants sont absorbés par une solution à effet physique ; chauffer l'absorbat (15, 16) ; mettre l'absorbat à un niveau de haute pression éclair (19) où le mélange se mettant en place de l'agent d'absorption pauvre en gaz acides et des gaz acides désorbés se sépare ; refroidir le gaz acide (20) désorbé et condenser (23) l'agent d'absorption évaporé hors du flux de gaz acide ; régler la pression du niveau de haute pression éclair (19) de sorte que le gaz acide désorbé (24) peut être condensé au moyen d'eau ou d'air de refroidissement (26) ; libérer l'agent d'absorption (30) pauvre en gaz acides des restes de gaz acides du niveau de haute pression éclair (19) dans un niveau de rectification de gaz (13) au moyen de gaz de rectification ; refroidir l'agent d'absorption (32) obtenu et le remettre dans le circuit (39, 41) au niveau d'absorption de gaz acides (2).

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