High ethane recovery configurations and methods in lng...

F - Mech Eng,Light,Heat,Weapons – 25 – J

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F25J 3/00 (2006.01) F25J 3/08 (2006.01)

Patent

CA 2651489

LNG is processed in contemplated plants and methods such that refrigeration content of the LNG feed is used to provide reflux duty to the demethanizer and to further condense a vapor phase of the demethanizer overhead product. In such plants, the demethanizer provides a bottom product to a deethanizer, wherein a demethanizer side draw provides refrigeration to the deethanizer overhead product to thus form an ethane product and deethanizer reflux.

Dans l'invention, le gaz naturel liquéfié (G.N.L.) est traité dans des installations de l'invention et par des procédés de l'invention, de sorte que le contenu de réfrigération de la charge de G.N.L. est utilisé pour fournir un reflux au déméthaniseur et pour condenser une phase vapeur du produit de tête du déméthaniseur. Dans de telles installations, le déméthaniseur fournit un résidu à un déséthaniseur, le tirage latéral d'un déméthaniseur fournissant une réfrigération au produit de tête du déséthaniseur pour former un produit d'éthane et un reflux de déséthaniseur.

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