Chemical recovery from kraft black liquor

Details Chemical recovery from kraft black liquor Chemical recovery from kraft black liquor

D - Textiles, Paper

21

C

D21C 11/12 (2006.01) D21C 11/00 (2006.01) D21C 11/10 (2006.01)

Patent

CA 2122893

An improved method of chemical recovery from kraft black liquor is disclosed in which the heat generated by controlled oxidation of the liquor is utilized to reduce the viscosity and net heating value of the liquor which allows the firing of a more concentrated liquor in the recovery boiler. Net steam recovery is increased for a given black liquor feed rate. Alternatively, the firing of liquor having a higher solids concentration is possible, which increases the throughput of the recovery boiler.

On divulgue une méthode améliorée de récupération chimique de la liqueur noire provenant du procédé kraft dans laquelle la chaleur générée par l'oxydation contrôlée de la liqueur est utilisée pour réduire la viscosité et le pouvoir calorifique inférieur de la liqueur qui permet la combustion d'une liqueur plus concentrée dans la chaudière de récupération. La récupération nette de vapeur est augmentée pour un débit d'alimentation en liqueur noire donné. Il est aussi possible de brûler une liqueur ayant une concentration plus élevée en solides, ce qui augmente le débit d'alimentation de la chaudière de récupération.

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