PROCESS FOR PRODUCING LIQUEFIED NATURAL GAS FROM A HIGH PRESSURE CURRENT OF CRUDE GAS

Abstract

Abstract Translated from French LE PROCEDE SELON L'INVENTION COMPORTE LA DETENTE ISENTROPIQUE DU COURANT D'ALIMENTATION ET LA DISTILLATION A UNE PRESSION INFERIEURE A LA PRESSION CRITIQUE POUR FORMER UN PRODUIT DE TETE RICHE EN METHANE ET UNE FRACTION DE FOND RICHE EN HYDROCARBURES LOURDS, LE PRODUIT DE TETE RICHE EN METHANE ETANT COMPRIME EN UTILISANT L'ENERGIE DE LA DETENTE ET LE PRODUIT COMPRIME ETANT ENSUITE LIQUEFIE DANS UN CYCLE DE REFRIGERATION EN UTILISANT EN PARTICULIER UN ECHANGEUR DE CHALEUR50 A PLUSIEURS CIRCUITS TUBULAIRES. THE PROCESS ACCORDING TO THE INVENTION INCLUDES ISENTROPIC RELAXATION OF THE SUPPLY CURRENT AND DISTILLATION AT A PRESSURE LOWER THAN CRITICAL PRESSURE TO FORM A METANE-RICH HEAD PRODUCT AND A HEAVY HYDROCARBON-RICH BOTTOM FRACTION, THE RICH HEAD PRODUCT OF METHANE BEING COMPRESSED USING THE RELAXATION ENERGY AND THE COMPRESSED PRODUCT THEN LIQUEFIED IN A REFRIGERATION CYCLE USING IN PARTICULAR A HEAT EXCHANGER50 WITH SEVERAL TUBULAR CIRCUITS.

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