Process for purifying condensate while evaporating waste...

D - Textiles – Paper – 21 – C

Patent

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D21C 11/10 (2006.01) D21C 11/06 (2006.01)

Patent

CA 2236479

The invention relates to a process for evaporating spent liquor or other waste liquids from cellulose cooking. The evaporation is performed in a multiplicity of evaporators which are coupled in series and in which the evaporation is driven using liquor steam. The condensates from the steam are divided, in one or more effects, into at least two fractions with respect to purity. The invention is characterized in that the purer fraction from one effect is conveyed, at a high level, into a subsequent effect in the direction of movement of the liquor, while the dirtier fraction is conveyed, at a high level or at the very top, into a preceding effect in the direction of movement of the liquor.

L'invention concerne un procédé d'évaporation de liqueur usée ou d'autres liquides usés au cours d'un processus de cuisson de cellulose. L'évaporation est effectuée dans une multiplicité d'évaporateurs branchés en série et dans lesquels l'évaporation est commandée au moyen de vapeur de liqueur. Les condensats provenant de la vapeur sont divisés, dans un ou plusieurs évaporateurs à effets multiples, en au moins deux fractions de plus ou moins grande pureté. L'invention est caractérisée par le fait que la fraction la plus pure d'un évaporateur est transportée à un niveau élevé afin d'être introduite dans un évaporateur suivant dans le sens du déplacement de la liqueur, tandis que la fraction la plus impure est transportée à un niveau élevé ou au sommet même, afin d'être introduite dans un évaporateur précédent dans le sens du déplacement de la liqueur.

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