Process for the production of sulphuric acid from sulphur...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/765 (2006.01)

Patent

CA 2138022

Process according to which gases containing sulphur dioxide and oxygen are made to flow into a converter comprising a plurality of stages where the gases are placed in contact with a catalyst, means of cooling the gases between the stages, and optionally a SO3 absorption device placed between the two stages. Before the gases flow into a stage other than the first, oxygen is added to them, and simultaneously in at least one of the stages following the admission of oxygen, the temperature is brought to a level of 3 to 50 DEG C lower than the temperature normally in use, if oxygen is not added. Accordingly the conversion rate for sulphur dioxide into sulphur trioxide or the process rate of the plant, or both, are thereby improved.

2138022 9424045 PCTABS00168 Procédé dans lequel on fait passer des gaz contenant du dioxyde de soufre et de l'oxygène dans un convertisseur comportant une pluralité d'étages où les gaz sont mis en contact avec un catalyseur, des moyens pour refroidir les gaz entre les étages, et éventuellement un dispositif d'absorption de SO3 placé entre deux étages. Avant de faire pénétrer les gaz dans un étage autre que le premier, on leur ajoute de l'oxygène, et simultanément, dans au moins un des étages qui suivent l'introduction de l'oxygène, on abaisse leur température à un niveau inférieur de 3 à 50 ·C à ce qu'elle est dans la pratique courante, si on n'ajoute pas d'oxygène. On améliore ainsi, selon le cas, le taux de conversion de dioxyde en trioxyde de soufre, ou le débit traité par l'installation, ou ces deux éléments.

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