Hydrocarbon synthesis with cryogenic nitrogen removal...

Details Hydrocarbon synthesis with cryogenic nitrogen removal... Hydrocarbon synthesis with cryogenic nitrogen removal...

C - Chemistry, Metallurgy

07

C

C07C 1/04 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2287458

In a hydrocarbon synthesis process, nitrogen is cryogenically removed from natural gas to produce a synthesis gas feed comprising methane which is substantially free of nitrogen. This feed is converted to a synthesis gas comprising a mixture of H2 and CO which is substantially free of the HCN and NH3 hydrocarbon synthesis catalyst deactivating nitrogen species. This reduces the need for rejuvenating the hydrocarbon synthesis catalyst. During the cryogenic separation, C2+ hydrocarbons are separated from the natural gas and all or a portion of the separated C2-C4 hydrocarbons are added to the methane feed before it is converted into syngas, to increase syngas production. All or a portion of the separated C2-C3 hydrocarbons may be removed as LPG.

Selon un procédé de synthèse des hydrocarbures, on extrait l'azote du gaz naturel par une technique cryogénique, de façon à produire un flux d'alimentation en gaz de synthèse renfermant du méthane sensiblement dépourvu d'azote. On convertit ce flux en gaz de synthèse renfermant un mélange de H2 et CO sensiblement dépourvu de HCN et de NH3 en présence d'un catalyseur de la synthèse d'hydrocarbures désactivant les composés azotés. Avec ce système, on a moins besoin de régénérer ledit catalyseur. Durant la séparation cryogénique, on sépare les hydrocarbures C2+ du gaz naturel et on ajoute la totalité ou une partie des hydrocarbures C2-C4 séparés au flux d'alimentation en méthane avant de convertir celui-ci en gaz de synthèse, ce qui permet d'augmenter sa production. Il est possible d'extraire la totalité ou une partie des hydrocarbures C2-C3 sous forme de GPL.

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