B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/14 (2006.01)
Patent
CA 2379233
The invention relates to a method for removing mercaptans from fluid fluxes containing mercaptans, in particular from hydrocarbon gases, such as natural gas, synthesis gas from heavy oil or heavy residues or refinery gas, or also from liquid hydrocarbons, for example, LPG (liquefied petroleum gas). According to the invention, a fluid flux of this type is brought into contact with a washing solvent in an absorption or extraction zone. Said solvent contains at least one aliphatic alkanolamine which has 2 - 12 C-atoms. Enough washing solvent is supplied to the absorption or extraction zone to more or less completely eliminate at least CO2 and H2S from the fluid flux. The substantially purified fluid flux is subsequently separated from the charged washing solvent and both the fluid flux and the washing solvent are evacuated from the absorption zone. The major part of the mercaptans are removed from the gas flux by the more or less complete removal of CO2 and H2S, without a notable portion of the hydrocarbon gases dissolving in the washing solvent.
L'invention concerne un procédé permettant de supprimer des mercaptans de courants de flux en contenant, notamment de gaz d'hydrocarbures à l'état gazeux, comme le gaz naturel, le gaz de synthèse issu de l'huile lourde ou de résidus lourds ou de gaz de raffinerie, ou encore d'hydrocarbures à l'état liquide, comme le gaz de pétrole liquéfié (GPL). Selon l'invention, on amène un tel courant de flux en contact intime avec un liquide laveur dans une zone d'absorption ou d'extraction. Ce liquide laveur contient au moins un alcalino-amine aliphatique ayant 2 à 12 atomes de carbone. On alimente la zone d'absorption ou d'extraction en liquide laveur en quantité telle qu'au moins du CO¿2? et H¿2?S soient sensiblement entièrement supprimés du courant de flux. Ensuite, on sépare le courant de flux largement épuré du liquide laveur chargé puis on évacue le courant de flux et le liquide laveur de la zone d'absorption. Si le CO¿2? et le H¿2?S sont sensiblement entièrement supprimés, la majeure partie des mercaptans est éliminée du flux gazeux sans qu'une fraction notable des hydrocarbures à l'état gazeux ne se dissolve dans le liquide laveur.
Grossmann Christoph
Holst Thomas S.
Hugo Randolf
Wagner Rupert
Basf Aktiengesellschaft
Robic
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