Process for separating selected components from...

B - Operations – Transporting – 01 – D

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B01D 53/14 (2006.01) C01B 31/20 (2006.01) C07C 7/00 (2006.01) C07C 7/11 (2006.01)

Patent

CA 2229186

A process for separating components of gas mixtures which have different hydrate forming characteristics which uses an aqueous liquid to absorb one the gases preferentially by attaining conditions slightly above the catastrophic point at which gas hydrates form. Specifically, the separation of gas mixtures containing light hydrocarbons and carbon dioxide is accomplished without significantly reducing the pressure of the carbon dioxide or without requiring significant amounts of heat energy for regeneration. A light hydrocarbon gas feed stream (2) is sent to a high pressure absorbing column (10) where it is contacted with an aqueous liquid stream (4). The liquid stream containing stripped carbon dioxide (8) is fed to a high pressure regeneration column (30) to remove the carbon dioxide as an overhead stream (34).

La présente invention concerne un procédé de séparation des constituants de mélanges de gaz présentant des caractéristiques différentes de formation des hydrates. Ce procédé, qui fait appel à un liquide aqueux pour absorber préférentiellement l'un des gaz, consiste à atteindre des conditions légèrement supérieures au point de catastrophe auquel se forment les hydrates des gaz. En l'occurrence, la séparation des mélanges de gaz contenant des hydrocarbures légers et du gaz carbonique se réalise sans réduction notable de la pression du gaz carbonique, ni apport d'importantes quantités d'énergie thermique pour la régénération. Un flux (2) d'alimentation en gaz d'hydrocarbure léger est envoyé dans une colonne absorbante (10) à haute pression où il entre en contact avec un flux liquide aqueux (4). Le flux liquide contenant le gaz carbonique (8) extrait est envoyé vers une colonne de régénération (30) à haute pression permettant d'éliminer le gaz carbonique sous forme de flux de tête de colonne (34).

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