Multi - stage membrane separation process

Details Multi - stage membrane separation process Multi - stage membrane separation process

B - Operations, Transporting

01

D

B01D 53/22 (2006.01) B01D 61/36 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2711478

The invention concerns a process for the removal of gaseous acidic contaminants, especially carbon dioxide and/or hydrogen sulphide, in two or more stages from a gaseous hydrocarbonaceous feedstream (1) comprising hydrocarbons and said acidic contaminants, using one or more membranes in each separation stages. The gaseous hydrocarbonaceous feedstream is especially a natural gas stream. The process is especially suitable for feedstreams comprising very high amounts of acidic contaminants, especially carbon dioxide, e.g. more than 25 vol. %, or even more than 45 vol. %. In a first stage (2) a pure or almost pure stream of acidic contaminants is separated from the feedstream, the acidic contaminants (4) stream suitably containing less than 5 vol% of hydrocarbons. The remaining stream (3) comprises the hydrocarbons and still a certain amount of gaseous acidic contaminants. In a second stage (5) a pure or almost pure stream of hydrocarbons (8) is separated from the remaining stream, where after the then remaining stream (6) is combined with the feed for the first stage (1), the hydrocarbon stream suitably containing less than 5 vol% of acidic contaminants.

Cette invention concerne un procédé d'extraction de contaminants acides gazeux, en particulier de dioxyde de carbone et/ou de sulfure d'hydrogène, ceci en deux étapes ou plus à partir d'un flux d'alimentation hydrocarboné (1) comprenant des hydrocarbures et lesdits contaminants acides, au moyen d'une ou de plusieurs membranes pour chaque étape de séparation. Le flux d'alimentation hydrocarboné gazeux est plus particulièrement un flux de gaz naturel. Le procédé convient tout spécialement pour des flux d'alimentation à forte teneur en acides contaminants, par exemple plus de 25%, voire plus de 45% en volume. Au cours d'une première étape (2), un flux de contaminants acides pur ou presque pur est séparé du flux d'alimentation, les contaminants acides (4) contenant de manière appropriée moins de 5% en volume d'hydrocarbures. Le flux restant (3) comprend les hydrocarbures et toujours une certaine quantité de contaminants acides gazeux. Au cours d'une seconde étape (5), un flux pur ou quasi pur d'hydrocarbures (8) est séparé du flux restant, à la suite de quoi le flux restant (6) est combiné à l'alimentation de la première étape (1), le flux d'hydrocarbures contenant de manière appropriée moins de 5% en volume de contaminants acides.

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