Use of alkyleneamines for enhancing lime mud dewatering

D - Textiles – Paper – 21 – C

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

Patent

CA 2378766

A process for dewatering lime mud in a kraft pulping process is described. The process includes an improvement which comprises adding an effective amount of an alkyleneamine to the lime mud prior to filtration. The preferred alkyleneamine is ethyleneamine, that is, an amine having at least one -(CR2- CR2-NH-)- unit wherein each R independently is H or an alkyl (straight, branched or cyclic) group of from 1 to 10 carbon atoms. Ethyleneamines include ethylenediamine, diethylenetriamine, triethylenediamine, triethylenetetramine, tetraethylenepentamine, piperazine, aminoethylpiperazine, and ethyleneamine mixtures such as mixtures of ethyleneamine oligomers having an average molecular weight of about 200-500.

L'invention concerne un procédé permettant d'épaissir de la boue de chaux au cours d'un procédé Kraft. L'invention concerne une amélioration du procédé. Ce procédé consiste à ajouter une quantité efficace d'un alkylèneamine à de la boue de chaux avant la filtration. L'alkylèneamine préféré de l'invention est un éthylèneamine, c'est-à-dire un amine présentant au moins une unité -(CR¿2?-CR¿2?-NH-)- dans laquelle chaque R, indépendamment l'un de l'autre, représente H ou un groupe alkyle (pur, ramifié ou cyclique) comprenant de 1 à 10 atomes de carbone. Les éthylèneamines comprennent de l'éthylènediamine, du diéthylènetriamine, du triéthylènediamine, du triéthylènetetramine, du tetraéthylènepentamine, de la pipérazine, de l'aminoéthylpipérazine, et des mélanges d'éthylèneamines tels que des mélanges d'oligomères éthylèneamines présentant un poids moléculaire moyen d'environ 200-500.

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