Process for liquefying a natural gas stream containing at...

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

Patent

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F25J 3/02 (2006.01) F25J 1/00 (2006.01) F25J 1/02 (2006.01) F25J 3/08 (2006.01)

Patent

CA 2293590

This invention is a process for producing pressurized liquid (19) rich in methane from a multi-component feed stream (10) containing methane and a freezable component having a relative volatility less than that of methane. The multi-component feed stream (10) is introduced into a separation system (31) having a freezing section operating at a pressure above about 1,380 kPa (200 psia) and under solids forming conditions for the freezable component and a distillation section positioned below the freezing section. The separation system (31) produces a vapor stream (14) rich in methane and a liquid stream (12) rich in the freezable component. At least a portion of the vapor stream is cooled to produce a liquefied stream rich in methane having a temperature above about -112 °C (-170 °F) and a pressure sufficient for the liquid to be at or below its bubble point to produce a product (20) and a stream (21) to provide refrigeration to the separation system.

L'invention concerne un procédé permettant d'obtenir un liquide sous pression (19) riche en méthane à partir d'une charge d'alimentation à constituants multiples (10) qui renferme du méthane et un constituant gelable dont la volatilité relative est inférieure à celle du méthane. Ladite charge (10) est introduite dans un système de séparation (31) ayant une section de congélation qui fonctionne à une pression supérieure à environ 1 380 kPa (200 psi en pression absolue) et qui entraîne une formation de solides pour le constituant gelable, ainsi qu'une section de distillation placée sous la section de congélation. Le système de séparation (31) produit un flux de vapeur (14) riche en méthane et un flux liquide (12) riche dudit constituant gelable. Au moins une partie du flux de vapeur est refroidie pour donner un flux liquéfié riche en méthane, ayant une température supérieure à environ -112 DEG C (-170 DEG F) et une pression suffisante pour que le produit liquide soit à son point de bulle ou au-dessous de ce point, afin de générer un produit (20) et un flux de gaz (21) conférant une action de réfrigération au système de séparation.

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