Ethane recovery methods and configurations

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

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F25J 3/02 (2006.01) F25J 3/00 (2006.01)

Patent

CA 2662803

Contemplated methods and configurations use a cooled ethane and CO2-containing feed gas that is expanded in a first turbo-expander and subsequently heat-exchanged to allow for relatively high expander inlet temperatures to a second turbo expander. Consequently, the relatively warm demethanizer feed from the second expander effectively removes CO2 from the ethane product and prevents carbon dioxide freezing in the demethanizer, while another portion of the heat-exchanged and expanded feed gas is further chilled and reduced in pressure to form a lean reflux for high ethane recovery.

L'invention concerne des procédés et des configurations qui utilisent un gaz d'alimentation refroidi contenant de l'éthane et CO2 qui est expansé dans un premier turbo-expanseur et, par la suite, soumis à un échange de chaleur pour créer des températures d'entrée d'expanseur relativement élevées dans un second turbo-expanseur. En conséquence, l'alimentation d'un déméthaniseur relativement chaud provenant du second expanseur permet de retirer efficacement CO2 du produit d'éthane et empêche le dioxyde de carbone de geler dans le déméthaniseur, alors qu'une autre partie du gaz d'alimentation ayant subi un échange de chaleur et ayant été expansée est à nouveau refroidie et sa pression diminuée pour former un reflux pauvre permettant de maximiser la récupération d'éthane.

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