Removing carbon dioxide, ethane and heavier components from...

C - Chemistry – Metallurgy – 10 – L

Patent

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C10L 3/10 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2256611

Removing carbon dioxide, ethane and heavier components from high pressure natural gas (10) comprises: partly condensing and expanding the high pressure natural gas (10) to obtain a gaseous stream (30) enriched in methane and carbon dioxide and two liquid streams (37 and 40) enriched in ethane and heavier components which are introduced into fractionation column (35); removing from fractionation column (35) fluid stream (45), heating (46) the fluid stream to obtain a reboiling stream (47) which is introduced into the fractionation column (35); removing from fractionation column (35) liquid stream (50) enriched in carbon dioxide, ethane and heavier components; removing from the top of fractionation column (35) a gaseous overhead stream (55) enriched in methane; cooling (56) the gaseous overhead stream (55) to obtain a two-phase fluid, separating (58) the two-phase fluid into cooled gaseous overhead stream (60) and first reflux stream (62) which is introduced into the fractionation column (35); and expanding (65) the cooled gaseous overhead stream (60) to obtain a two-phase fluid at low pressure, separating (69) the two-phase fluid into gaseous product stream (70) and second reflux stream (72) which is introduced into the top of the fractionation column (35).

Ce procédé d'enlèvement de dioxyde de carbone, d'éthane et de constituants plus lourds à partir de gaz naturel sous haute pression (10) comprend les étapes consistant: à partiellement condenser et détendre ce gaz naturel sous haute pression (10), afin d'obtenir un flux gazeux (30) enrichi en méthane et en dioxyde de carbone et deux flux liquides (37 et 40) enrichis en éthane et en constituants plus lourds, flux que l'on introduit dans une colonne de fractionnement, puis à enlever de cette colonne (35) un flux fluide (45), à chauffer (46) celui-ci pour obtenir un flux de rebouillage (47) que l'on introduit dans la colonne de fractionnement (35), puis à enlever de cette colonne (35) un flux liquide (50) enrichi en dioxyde de carbone, en éthane et en constituants plus lourds, à enlever du sommet de la colonne (35) un courant gazeux de tête (55) enrichi en méthane, à refroidir (56) le flux gazeux de tête (55) afin d'obtenir un fluide à deux phases, à séparer ce fluide en un flux gazeux de tête refroidi (60) et un premier flux de reflux 62) que l'on introduit dans la colonne de fractionnement (35), à détendre (65) le flux de tête gazeux refroidi (60), afin d'obtenir un fluide basse pression à deux phases, et enfin à séparer (69) ce fluide à deux phases, d'une part, en un flux contenant des produits gazeux (70) et, d'autre part, en un flux de reflux (72) que l'on introduit dans la colonne de fractionnement (35), par le sommet de celle-ci.

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