Hydrocarbon catalytic cracking process

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 11/18 (2006.01) B01D 53/04 (2006.01) C10G 55/06 (2006.01) C10G 70/04 (2006.01)

Patent

CA 2156582

Hydrocarbon fluid catalytic cracking (FCC) plants are debottlenecked by replacing air feed to the cracking catalyst regenerator with oxygen and carbon dioxide exhaust from the catalyst regenerator and removing methane and hydrogen from the wet gas stream leaving the main fractionator overhead receiver prior toits introduction into a wet gas compressor system. Nitrogen is removed from the exhaust gas and methane and hydrogen are removed from the wet gas in the same pressure swing adsorption (PSA) plant. During air replacement, exhaust gas is processed in the PSA plant and when the desired amount of nitrogen is removed from the exhaust gas, feed of exhaust gas to the PSA plant is terminated and flow of wet gas to the PSA plant is initiated.

On élimine les points d'étranglement dans les usines de craquage catalytique des hydrocarbures liquides en remplaçant l'alimentation en air du régénérateur de catalyseur de craquage par de l'oxygène et du dioxyde de carbone émis par le régénérateur de catalyseur, et en éliminant le méthane et l'hydrogène du circuit de gaz humide sortant du récipient de tête de la colonne de fractionnement principale, avant son introduction dans le système de compression du gaz humide. L'azote est éliminé du gaz émis, et le méthane et l'hydrogène sont éliminés du gaz humide dans la même unité d'adsorption modulée en pression (AMP). Au cours du remplacement de l'air, le gaz émis est traité dans l'unité AMP et, lorsque la quantité désirée d'azote est éliminée du gaz émis, l'alimentation de l'unité AMP en gaz émis est interrompue, et l'alimentation en gaz humide de l'unité AMP est mise en route.

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