Purification process

B - Operations – Transporting – 01 – J

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B01J 20/34 (2006.01) B01D 53/04 (2006.01)

Patent

CA 2199362

Regeneration of an adsorbent bed on to which impurity compounds, e.g. sulphur compounds, have been adsorbed by means of a gas stream to desorb the impurity compounds. The gas stream containing the desorbed impurity compounds is then passed over a catalyst, e.g. a hydro-desulphurisation catalyst, effective to cause the reaction of at least some of the desorbed impurity compounds with hydrogen to give a reaction product which is then removed by absorption using a bed of non-regenerable absorbent. At least some of the gas stream is then recycled to the adsorbent bed undergoing regeneration. Hydrogen is added in approximately the stoichiometric amount required for the reaction with the impurity compounds before the regeneration gas enters the catalyst.

Régénération d'un lit adsorbant sur lequel des composés porteurs d'impuretés, tels que des composés de soufre, ont été adsorbés au moyen d'un courant gazeux afin de désorber les composés porteurs d'impuretés. Le courant gazeux contenant les composés porteurs d'impuretés désorbés passe ensuite sur un catalyseur, tel qu'un catalyseur d'hydro-désulfuration, efficace pour provoquer la réaction d'au moins une partie des composés désorbés avec l'hydrogène afin d'obtenir un produit de réaction qui est ensuite retiré par absorption au moyen d'un lit d'absorbant non régénérable. Au moins une partie du courant gazeux est ensuite recyclée vers le lit adsorbant subissant une régénération. L'hydrogène est ajouté aux composés porteurs d'impuretés selon approximativement la quantité stoïchiométrique nécessaire à la réaction avant pénétration du gaz de régénération dans le catalyseur.

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