Olefin recovery method

Refrigeration – Processes – Circulating external gas

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62 28, F25J 302

Patent

active

054525810

ABSTRACT:
A method is described for recovering olefins by condensation from the reaction effluent stream from a cracking furnace containing olefins and hydrogen wherein a membrane separator is employed to reject the hydrogen from the reaction effluent stream. In such a manner, the dew point temperature of the stream can be increased and the energy required to provide refrigeration for olefin condensation can be reduced. The method comprises primary condensation, vapor-liquid separation and membrane hydrogen rejection steps followed by a series of cascaded chilling and vapor-liquid separation steps. Condensate recovered is processed in a demethanizer to separate light end components. Also disclosed is an olefins plant employing a membrane separator for rejecting hydrogen to enhance the energy efficiency and/or facilitate the expansion of plant capacity.

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Weber et al., Chemical Engineering Process, pp. 23-28, Nov., 1986.
Davis, "Facilitated Transport Membrane Hybrid Systems for Olefin Publication," BP Research/Catalyst Consultants Inc. of Pennsylvania, Nov., 1991.
Lam et al., "Advanced Ethylene Process," A.I.Ch.E. Spring National Meeting, Mar. 31, 1993, Houston, Texas.
MEDAL Separation System, Manufacturer's Literature, Jul. 1991.

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