Method for removing cos from a stream of hydrocarbon fluid...

B - Operations – Transporting – 01 – D

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Details

B01D 53/14 (2006.01) B01D 11/04 (2006.01) B01D 53/96 (2006.01) C10K 1/14 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2386397

The invention relates to a method for removing COS from a stream of hydrocarbon fluid containing COS, in particular, from a stream of gas, such as for example, natural gas, synthesis gas from heavy oil or heavy residues or refinery gas, or from liquid or liquefied hydrocarbons, such as for example, LPG (Liquefied Petroleum Gas) or NGL (Natural Gas Liquids) and to a wash liquid for use in methods of this type. The stream of fluid is brought into direct contact with the inventive wash fluid in an absorption or extraction zone. Said wash fluid consists of an aqueous amine solution which contains 1.5 to 5 moles/l of an aliphatic alkanolamine having between 2 and 12 C atoms and 0.4 to 1.7 moles/I of a primary or secondary amine as the activator. Substantially all of the COS is removed from the stream of fluid using the inventive amine wash. The stream of fluid which has been substantially cleaned of COS and the wash fluid which is loaded with COS are subsequently separated from one another and both fluids are fed out of the absorption or extraction zone. The wash fluid can subsequently be regenerated in the known manner and can be fed back to the absorption or extraction zone. Image

Procédé permettant d'éliminer du COS d'un flux fluide d'hydrocarbure contenant du COS, en particulier d'un flux de gaz, tel que par exemple du gaz naturel, du gaz de synthèse tiré d'huile lourde ou de résidus lourds ou du gaz de raffinerie, ou d'hydrocarbures liquides ou liquéfiés, comme par exemple du GPL (gaz de pétrole liquéfié) ou des liquides du gaz naturel, ainsi que liquide de lavage destiné à être utilisé en association avec ledit procédé. Le flux de fluide est mis en contact intime avec le liquide de lavage selon la présente invention dans une zone d'absorption/extraction. Ledit liquide de lavage est constitué d'une solution aqueuse d'amines qui contient 1,5 à 5 moles/l d'une alcanolamine aliphatique ayant 2 à 12 atomes de carbone et 0,4 à 1,7 mole/l d'une amine primaire ou secondaire en tant qu'activateur. Le liquide de lavage à base d'amines selon la présente invention permet d'éliminer de manière pratiquement totale le COS du flux de fluide. Ensuite le flux de fluide largement purifié du COS et le liquide de lavage chargé de COS sont séparés l'un de l'autre et acheminés hors de la zone d'absorption/extraction. Le liquide de lavage peut finalement être régénéré de manière connue, puis réintroduit dans la zone d'absorption/extraction.

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