Process for the removal of water, co2, ethane and c3+...

Details Process for the removal of water, co2, ethane and c3+... Process for the removal of water, co2, ethane and c3+...

C - Chemistry, Metallurgy

10

L

C10L 3/10 (2006.01) B01D 53/04 (2006.01) B01D 53/047 (2006.01) C07C 7/12 (2006.01)

Patent

CA 2246915

A process is set forth for the selective removal of water, CO2, ethane and C3+ hydrocarbons from gas streams, particularly a natural gas stream comprising primarily methane. The process comprises contacting the gas stream with an adsorbent material consisting exclusively of one or more compounds which are basic (i.e. compounds which, when contacted with a pH neutral aqueous solution, cause such solution to have a pH greater than 7.0) and which are mesoporous (i.e. compounds which have moderately small pores providing a surface area less than 500m2/g). A key to the present invention is that the adsorbent material is selective for the removal of all the impurities noted above, thereby eliminating the need for a separate impurity-specific adsorbent such as an adsorbent specific for the removal of CO2 and/or an adsorbent specific for the removal of water. Typical mesoporous adsorbents which are useful in the present invention include zinc oxide, magnesium oxide and, in particular, activated alumina.

Divulgation d'un procédé pour l'élimination sélective de l'eau, du CO2, de l'éthane et des hydrocarbures comportant 3 ou plus de 3 atomes de carbone de circuits de gaz, en particulier d'un circuit de gaz naturel composé principalement de méthane. Ce procédé comprend : la mise en contact du circuit de gaz avec une matière adsorbante constituée exclusivement d'un ou de plusieurs composés basiques (p. ex., des composés qui, lorsqu'ils sont mis en contact avec une solution aqueuse de pH neutre, font augmenter le pH de cette solution à une valeur supérieure à 7,0) et mésoporeux (i.e., des composés ayant des pores relativement petits, permettant d'obtenir une surface efficace inférieure à 500 m2/g). Un élément clé de cette invention est que la matière adsorbante élimine sélectivement toutes les impuretés susmentionnées, éliminant ainsi le besoin d'avoir à utiliser séparément un adsorbant spécifique d'une impureté, comme un adsorbant spécifique à l'élimination du CO2 et/ou un adsorbant spécifique à l'élimination de l'eau. Parmi les adsorbants mésoporeux typiquement utilisables pour cette invention, on retrouve l'oxyde de zinc, l'oxyde de magnésium et, en particulier, l'alumine oxydée.

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