Multi-bed selective hydrogenation of acetylenes

C - Chemistry – Metallurgy – 07 – C

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C07C 5/09 (2006.01) C07C 5/08 (2006.01) C07C 11/04 (2006.01) C10G 70/02 (2006.01)

Patent

CA 2175565

Compensation for catalyst activity decline in multi-bed selective hydrogenation of acetylenes in the presence of olefins by providing inter-bed heating so that the product from the first bed is heated before it is fed to the second bed, and the temperature at which the product from the first bed is fed to the second bed is increased as the catalyst activity declines. In a modification, when the catalyst is fresh, the product from the first bed is cooled before it is fed to the second bed, but, as the catalyst activity declines the temperature at which the product from the first bed is fed to the second bed is increased, so that after a period of use the product from the first bed is heated before it is fed to the second bed.

La baisse d'activité du catalyseur dans l'hydrogénation sélective à lits multiples d'acétylènes en présence d'oléfines est compensée par un chauffage prévu entre les lits, qui permet de chauffer le produit du premier lit avant qu'il soit amené au second lit et d'augmenter la température à laquelle le produit du premier lit est amené au second au fur et à mesure que l'activité du catalyseur diminue. Dans une variante, lorsque le catalyseur est neuf, le produit du premier lit est refroidi avant d'être amené au deuxième. Lorsque l'activité du catalyseur diminue, la température à laquelle le produit du premier lit est amené au deuxième est augmentée, de telle sorte qu'après un certain temps d'utilisation, le produit du premier lit est chauffé avant d'être amené au deuxième.

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