Method of recovering energy and chemicals from black liquor

Details Method of recovering energy and chemicals from black liquor Method of recovering energy and chemicals from black liquor

D - Textiles, Paper

21

C

D21C 11/00 (2006.01) D21C 11/04 (2006.01) D21C 11/06 (2006.01) D21C 11/12 (2006.01)

Patent

CA 2103664

A method and apparatus for treating black liquor generated in a sulfate pulping process to recover energy and chemicals therefrom includes heating (4) the black liquor (2) at a temperature and for a time period to produce substantial volumes of off gases (7) containing organic sulfur compounds; generating hydrogen sulfide (9) and preferably methane from the off gases; and utilizing the generated hydrogen sulfide in the sulfate pulping process. The hydrogen sulfide can be absorbed (13) into white liquor (15) to selectively control the sulfur content of the white liquor. The methane (31) is used as fuel in a lime reburning kiln (16).

éthode et appareil pour traiter la liqueur noire produite par le procédé kraft pour récupérer l'énergie et les produits chimiques qu'elle contient. Elle consiste à chauffer (4) la liqueur noire (2) à une certaine température et pendant un certain temps pour produire des volumes substantiels de gaz résiduels (7) contenant des composés organiques soufrés; à produire du sulfure d'hydrogène (9) et, préférablement, du méthane à partir des gaz résiduels; et à utiliser le sulfure d'hydrogène produit dans le procédé kraft. Le sulfure d'hydrogène peut être absorbé (13) dans la liqueur blanche. Le méthane (31) est utilisé comme combustible dans un four de rebrûlage de la chaux (16).

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