Sulfur recovery from spent liquor gasification process

Details Sulfur recovery from spent liquor gasification process Sulfur recovery from spent liquor gasification process

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D21C 11/04 (2006.01) B03C 3/01 (2006.01) B03C 3/013 (2006.01) B03C 3/12 (2006.01) B03C 3/88 (2006.01) D21C 11/06 (2006.01) D21C 11/12 (2006.01) F23C 9/08 (2006.01) F23G 5/027 (2006.01) F23G 5/16 (2006.01) F23G 5/46 (2006.01) F23G 7/04 (2006.01) F23J 15/02 (2006.01) F23J 15/04 (2006.01) F23L 7/00 (2006.01)

Patent

CA 2370964

A method and apparatus for processing a waste stream from digestion of lignocellulosic material to form useful products. The waste stream (1) can comprise black liquor, red liquor, alkaline, acidic or neutral sulfite spent liquor, or polysulfide spent liquor. Partial oxidation (100) is performed on the waste stream to form hot gases and molten salts. These are cooled using a quench liquor (102) to form quenched gas and carbonate liquor from which particles are removed to form a raw fuel gas. H2S is removed from the raw fuel gas using an H2S removal process (105) which is more selective for H2S than it is for CO2, following the particle removing step (104), thereby forming usable fuel gas (5) as one useful product, and acid gases (6). Further processing is performed on the acid gases to produce additional useful products.

L'invention concerne un procédé et un appareil de traitement de déchets d'une digestion de matière lignocellulosique, de façon à former des produits utiles. Le flux de déchets (1) peut comporter une liqueur noire, une liqueur rouge, une liqueur usée au sulfite alcalin, acide ou neutre, ou une liqueur usée au polysulfure. On procède à une oxydation partielle (100) du flux de déchets de façon à former des gaz chauds et des sels fondus. On refroidit ensuite ces derniers au moyen d'une liqueur de refroidissement (102) afin de former un gaz refroidi et une liqueur carbonatée de laquelle on extrait des particules pour former un gaz combustible brut. On extrait ensuite du H¿2?S du gaz combustible brut au moyen d'un procédé d'extraction de H¿2?S (105), plus sélectif pour le H¿2?S que pour le CO¿2?, suite à l'extraction des particules (104), formant ainsi du gaz combustible utilisable (5), soit un produit utile, ainsi que des gaz acides (6). Les gaz acides subissent un traitement ultérieur de façon à produire des produits utiles additionnels.

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