Process and apparatus for the catalytic oxidation of...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/765 (2006.01) B01J 8/06 (2006.01) C01B 17/80 (2006.01)

Patent

CA 2668059

The present invention relates to a process for the continuous catalytic complete or partial oxidation of a starting gas containing from 0.1 to 66% by volume of sulphur dioxide plus oxygen, in which the catalyst is kept active by means of pseudoisothermal process conditions with introduction or removal of energy. In addition, the present invention relates to an apparatus for the continuous catalytic complete or partial oxidation of a starting gas containing sulphur dioxide and oxygen, characterized by at least one tube contact apparatus which is an upright heat exchanger composed of at least one double-walled tube whose catalyst-filled inner tube forms a reaction tube, with heat being transferred in cocurrent around the reaction tube and an absorber for separating off SO3 being installed downstream of the tube contact apparatus. The reactivity of the catalyst is preset by mixing with inert material. The apparatus of the invention is particularly suitable for carrying out the process of the invention.

La présente invention concerne un procédé d'oxydation catalytique continue totale ou partielle d'un gaz de départ contenant de 0,1 à 66 % vol. de dioxyde de soufre et de l'oxygène, selon lequel le catalyseur est maintenu actif par un procédé quasi-isotherme par apport ou élimination d'énergie. La présente invention concerne également un dispositif pour l'oxydation catalytique continue totale ou partielle d'un gaz de départ contenant du dioxyde de soufre et de l'oxygène, caractérisé en ce qu'il comporte au moins un appareil à contact de tubes est au moins un échangeur de chaleur vertical comprenant au moins un tube à double enveloppe, dont le tube interne rempli de catalyseur constitue un tube de réaction, la chaleur étant transférée en un courant continu autour du tube de réaction et un absorbeur pour la séparation de SO3 étant disposé en aval de l'appareil à contact de tubes. La réactivité du catalyseur est préréglée par mélange avec un matériau inerte. Le dispositif selon l'invention s'utilise notamment pour la réalisation du procédé selon l'invention.

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