Process for the preparation of hydrocarbons

C - Chemistry – Metallurgy – 07 – C

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C07C 1/04 (2006.01) C10G 2/00 (2006.01)

Patent

CA 2456825

Process for the preparation of liquid hydrocarbons and a clean gas stream suitable as feed and/or fuel gas from synthesis gas comprising the following steps: (i) catalytically converting the synthesis gas at elevated temperature and pressure into liquid hydrocarbons, (ii) separating products stream obtained in step (i) into a light product stream comprising at least carbon dioxide, unconverted synthesis gas, light hydrocarbons, oxygenates and inerts and a heavy product stream comprising mainly normally liquid and normally solid hydrocarbons; (iii) separating at least carbon dioxide from the light product stream obtained by means of a physical absorption process using a liquid absorbent, preferably a continuous, regenerative absorption process.

L'invention concerne un procédé pour la préparation d'hydrocarbures liquides et d'un flux de gaz purifié approprié pour servir de gaz d'alimentation et/ou de gaz de combustion, à partir d'un gaz de synthèse. Ce procédé comprend les étapes suivantes : (i) conversion catalytique du gaz de synthèse, à une température et à une pression élevées, en hydrocarbures liquides ; (ii) séparation du flux de produits obtenu à l'étape (i) en un flux de produit léger comprenant au moins du dioxyde de carbone, du gaz de synthèse non converti, des hydrocarbures légers, des composés oxygénés et des matières inertes, et en un flux de produit lourd comprenant principalement des hydrocarbures normalement solides et des hydrocarbures normalement liquides ; (iii) séparation au moins du dioxyde de carbone contenu dans le flux de produit léger obtenu selon un procédé d'absorption physique au moyen d'un absorbant liquide, de préférence selon un procédé d'absorption régénératif continu.

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