Light gas component separation

Details Light gas component separation Light gas component separation

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 3/00 (2006.01)

Patent

CA 2587821

A method of separating light component(s), such as helium, from carbon dioxide. A pressurized feed stream (10) is at least partially condensed. The resulting containing light component(s) and carbon dioxide stream (14) is degassed to produce a first vapor stream (22) enriched in the light component(s) and a first liquid stream (20) having entrained light component(s). The first liquid stream (20) is expanded (26) to create another two-phase stream (28) that is degasified to produce a second vapor stream, (36) enriched in the light component(s), and a second liquid stream (38) enriched in carbon dioxide. The second liquid stream (38) is repressurized and vaporized. In case of a supercritical feed (90), the pressurized feed stream (90) is expanded (94) after having been cooled. Thereafter, the feed (98) is degassed to produce the light component enriched vapor stream (102) and a liquid stream enriched in the carbon dioxide (104). The resultant vapor streams, enriched in the light component(s) may be further processed to isolate the light components.

L'invention concerne une méthode pour séparer au moins un composant de gaz léger, notamment l'hélium, à partir de dioxyde de carbone. Un flux de charge pressurisé (10) est au moins partiellement condensé. Le flux (14) obtenu contenant le composant léger et le dioxyde de carbone est dégazé pour produire un premier flux de vapeur (22) enrichi en composant léger susmentionné et un premier flux liquide (20) présentant le composant léger entraîné. Le premier flux liquide (20) est dilaté (26) pour créer un autre flux biphasique (28) dégazéifié pour produire un second flux de vapeur (36) enrichi en composant léger, et un second flux liquide (38) enrichi en dioxyde de carbone. Le second flux liquide (38) est repressurisé et vaporisé. Dans le cas d'une charge supercritique (90), le flux de charge pressurisé (90) est dilaté (94) après avoir été refroidi. Ensuite, la charge (98) est dégazée pour produire le flux de vapeur enrichi en composant léger (102) et un flux liquide enrichi en dioxyde de carbone (104). Les flux de vapeur obtenus enrichis en composant léger peuvent être ultérieurement traités pour isoler ce composant.

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