Method for isolating hydrogen sulphide from coke oven gas...

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 17/04 (2006.01) B01D 53/14 (2006.01) B01D 53/73 (2006.01) B01D 53/86 (2006.01)

Patent

CA 2493286

The invention relates to a method for isolating hydrogen sulphide from coke- oven gas with the subsequent recovery of elemental sulphur in a Claus plant. The hydrogen sulphide is eliminated from the coke-oven gas by gas washing using an absorption liquid. During the regeneration of the loaded absorption liquid, hydrogen sulphide is accumulated in concentrated form and is fed to the Claus plant. Said Claus plant comprises a Claus boiler, a waste-heat boiler, in addition to a reactor, which forms an additional catalyst stage. According to the invention, the Claus plant is operated with a single reactor, which operates at a working temperature of below 250 °°C. The process gas that exits the reactor is returned after the deposition of elemental sulphur with a non--reacted residual concentration of hydrogen sulphide to the coke-oven gas that is to be cleaned, prior to the gas washing stage.

L'invention concerne un procédé pour séparer de l'acide sulfhydrique de gaz de cokerie et obtenir du soufre élémentaire dans une installation Claus. L'acide sulfhydrique est extrait du gaz de cokerie par lavage du gaz avec un liquide d'absorption. Lors de la régénération du liquide d'absorption chargé est produit l'acide sulfhydrique sous forme concentrée, lequel est ensuite acheminé dans l'installation Claus. Cette installation Claus comprend une chaudière Claus, une chaudière à récupération et un réacteur qui constitue un niveau supplémentaire de catalyse. Selon l'invention, l'installation Claus fonctionne avec un seul réacteur dont la température de fonctionnement est inférieure à 250 ·C. Le gaz de processus sortant du réacteur est, après la séparation du soufre élémentaire, réintroduit avec le reste d'acide sulfhydrique n'ayant pas réagi dans le gaz de cokerie à nettoyer avant le lavage du gaz.

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