C - Chemistry – Metallurgy – 10 – L
Patent
C - Chemistry, Metallurgy
10
L
C10L 3/10 (2006.01) B01D 3/32 (2006.01)
Patent
CA 2759037
A system for removing acid gases from a raw gas stream the system includes a cryogenic distillation tower. The tower receives and separates the raw gas stream into an overhead methane stream and a bottom liquefied acid gas stream. Refrigeration equipment downstream of the cryogenic distillation tower cools the overhead methane stream and returns a portion of the overhead methane stream to the cryogenic distillation tower as liquid reflux. The system also may include a first molecular sieve bed upstream of the distillation tower and a second molecular sieve bed downstream of the distillation tower. The first molecular sieve bed adsorbs water while the second molecular sieve bed adsorbs additional acid gases from the cooled overhead methane stream.
L'invention porte sur un système d'élimination des gaz acides à partir d'un courant de gaz brut, le système comprenant une tour de distillation cryogénique. La tour reçoit et sépare le courant de gaz brut en un courant de méthane de tête et un courant de gaz acide liquéfié de queue. Un appareil de réfrigération en aval de la tour de distillation cryogénique refroidit le courant de méthane de tête et renvoie une partie du courant de méthane de tête à la tour de distillation cryogénique sous la forme d'un reflux liquide. Le système peut également comprendre un premier lit de tamis moléculaire en amont de la tour de distillation et un second lit de tamis moléculaire en aval de la tour de distillation. Le premier lit de tamis moléculaire adsorbe l'eau alors que le second lit de tamis moléculaire adsorbe les gaz acides supplémentaires à partir du courant de méthane de tête refroidi.
Kelley Bruce T.
Mart Charles J.
Northrop Paul Scott
Borden Ladner Gervais Llp
Exxonmobil Upstream Research Company
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