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 2711477

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, µsing 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 high amounts of acidic contaminants, e.g. between and 95 vol. % of carbon dioxide and/or hydrogen sulphide, especially between 15 and 70 vol. %. In a first stage (2) a clean or almost clean hydrocarbon stream (3) is separated from the feedstream, the hydrocarbon stream suitably containing less than 5 vol% of acidic contaminants. The remaining stream (4) comprises the acidic contaminants and a certain amount of hydrocarbons. In a second stage (6) a pure or almost pure stream of acidic contaminants (8) is separated from the remaining stream (7), where after the then remaining stream is combined with the feed for the first stage (1), the acidic contaminants stream suitably containing less than 5 vol% of hydrocarbons.

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 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 entre 15 et 70 vol% en volume. Au cours d'une première étape (2), un flux hydrocarboné propre ou presque propre est séparé du flux d'alimentation, ce flux hydrocarboné contenant de manière appropriée moins de 5% en volume de contaminants acides. Le flux restant renferme les contaminants acides et une certaine quantité d'hydrocarbures. Dans une seconde étape (6), un flux pur ou quasi pur de contaminants acides (8) est séparé du flux restant (7), à la suite de quoi le flux restant est combiné à l'alimentation de la première étape (1), le flux de contaminants acides contenant de préférence mons de 5% en volume d'hydrocarbures.

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