Process and plant for producing sulfuric acid from gases...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/765 (2006.01)

Patent

CA 2563950

The present invention relates to a process and a plant for producing sulfuric acid, in which a starting gas containing sulfur dioxide at least partly reacts with molecular oxygen in at least one contact with at least one contact stage to form sulfur trioxide, and in which the sulfur-trioxide-containing gas produced is introduced into an absorber and converted there to sulfuric acid. To achieve that only small gas volumes must be supplied to the first contact stage, based on the amount of sulfur dioxide used, with at least the same capacity of the plant and by using conventional catalysts, it is proposed in accordance with the invention to supply to the first contact stage a contact gas with a sulfur dioxide content of more than 16 vol-% and with a volumetric ratio of sulfur dioxide to oxygen of more than 2.67:1.

La présente invention concerne un processus et une installation pour produire de l'acide sulfurique, dans lesquels un gaz de départ contenant du dioxyde de soufre réagit au moins partiellement avec l'oxygène moléculaire lors d'au moins un contact, du trioxyde de soufre étant formé à au moins un stade, et dans lesquels le gaz contenant du trioxyde de soufre ainsi fabriqué est injecté dans un absorbeur et transformé en acide sulfurique. Afin de réduire au minimum le volume des gaz injectés au premier stade, en fonction de la quantité de dioxyde de soufre utilisé, et d'au moins maintenir la même capacité de l'installation et utiliser des catalyseurs traditionnels, on propose dans cette invention d'alimenter au premier stade de contact un gaz de contact avec une teneur en dioxyde de soufre de plus de 16 % en volume, et avec un taux volumétrique de dioxyde de soufre par rapport à l'oxygène supérieur à 2,67: 1.

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