Process for enhancement of the selectivity of physically...

C - Chemistry – Metallurgy – 10 – L

Patent

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Details

C10L 3/10 (2006.01) C10J 3/82 (2006.01) C10K 1/16 (2006.01)

Patent

CA 2595967

The invention relates to a method for recovering absorbed hydrocarbon components while absorbing acid gases form technical gases, as for example a natural gas, by means of physically active absorption agents, wherein the inventive method consists in increasing the pressure of a loaded absorption agent extracted from an adsorption device, in adding said loaded absorption agent to the top of a rectification column which consist of a lower feeding stove and of one or several lateral stoves operating at a pressure slightly greater than the absorption column pressure, in adjusting an equilibrium is said rectification column in such a way that the acid gas concentration in the absorption agent increases in the direction away from the bottom of the column and the hydrocarbon concentration decreases in said direction, in extracting a heated hydrocarbon-poor and acid gas component-rich absorption agent from the bottom of the column and in transferring said agent to an acid gas desorption device, in extracting a hydrocarbon-poor and acid gas component-rich recycling gas from the top of the rectification column, in cooling said recycling gas in a recycling gas cooler to a temperature of a service gas directed in the absorption device and in transferring said recycling gas directly to the absorption device or in mixing it with the service gas.

L'invention concerne un procédé de récupération de composés d'hydrocarbures absorbés lors de l'absorption de gaz acides à partir de gaz techniques tels que le gaz naturel par exemple, au moyen d'agents d'absorption à action physique. Ledit procédé consiste à augmenter la pression de l'agent d'absorption chargé, extrait du dispositif d'absorption ; à additionner l'agent d'absorption chargé sur le haut d'une colonne de rectification présentant un rebouilleur de bas de colonne et un ou plusieurs rebouilleurs latéraux, employée à une pression légèrement supérieure à celle de la colonne d'absorption ; à régler un équilibre dans cette colonne de rectification de telle manière que la concentration de gaz acides dans l'agent d'absorption augmente en direction du bas de colonne et la concentration des hydrocarbures diminue en direction du bas de colonne ; à extraire du bas de colonne un agent d'absorption chauffé pauvre en hydrocarbures et riche en constituants de gaz acides, et à acheminer celui-ci vers un dispositif de désorption de gaz acides ; à extraire du haut de la colonne de rectification un gaz de recyclage riche en hydrocarbures et pauvre en constituants de gaz acides ; et, à refroidir le gaz de recyclage dans un refroidisseur de gaz de recyclage à la température du gaz de travail, guidé dans le dispositif d'absorption, et à acheminer ledit gaz de recyclage directement dans le dispositif d'absorption ou à le mélanger au gaz de travail.

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