Catalyst and method for catalytic off-gas cleaning in the...

B - Operations – Transporting – 01 – J

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B01J 21/06 (2006.01) B01D 53/86 (2006.01) B01J 23/40 (2006.01) B01J 27/053 (2006.01)

Patent

CA 2215539

Disclosed are a catalyst for cleaning a pressurized off-gas obtained after the oxidation of para-xylene with air in the liquid phase in the preparation of dimethyl terephthalate, which comprises: a) at least one oxide of titanium, and b) at least one elements form subgroup VIII of the Periodic Table of the Elements in the metal or oxide form, a process for preparing the catalyst by applying the component b) to a shaped article which comprises at least the component a), individually or in a mixture by dip impregnation or spray impregnation, and a method of cleaning a pressurized off-gas obtained after the oxidation of para-xylene, in which the pressurized oxygen-containing off-gas from the oxidation is led first via a single-stage or multistage condensation, a single-stage or multistage absorption and subsequently, with or without the supply of oxygen, via a catalytic afterburner operated under pressure employing the catalyst.

On dévoile un catalyseur pour nettoyer les effluents gazeux sous pression obtenus après l'oxydation du para-xylène avec de l'air dans la phase liquide au cours de la préparation du diméthyltéréphtalate, qui comprend : a) au moins un oxyde de titane, et b) au moins un élément du sous-groupe VIII du Tableau périodique des éléments sous forme métallique ou d'oxyde, un procédé pour préparer le catalyseur par application du constituant b) à l'objet formé qui comprend au moins le constituant a), individuellement ou dans un mélange par imprégnation par immersion ou imprégnation par pulvérisation, et une méthode de nettoyage des effluents gazeux sous pression obtenus après l'oxydation du para-xylène, procédé dans lequel les effluents gazeux sous pression contenant l'oxygène provenant de l'oxydation passe d'abord par une condensation mono- ou multi-étape, une absorption mono- ou multi-étape et, subséquemment, avec ou sans apport d'oxygène, par un brûleur catalytique fonctionnant sous pression et employant le catalyseur.

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