Electromembrane processes for the treatment of kraft mill...

B - Operations – Transporting – 01 – D

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B01D 61/44 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2207658

Alkali metal hydroxide and acid are recovered from alkali metal salts by water-splitting. A two-compartment cell employs monovalent anion-selective membranes and bipolar membranes; a three-compartment cell (1) employs monovalent anion-selective membranes (3), cation-selective membranes (4) and bipolar membranes (2a, 2b). A particular application is the conversion of the Electrostatic Precipitator Catch of the recovery boiler of coastal and/or closed-cycle kraft pulp mill with reuse of the sodium/potassium hydroxide and sulfate, depleted in chloride.

On récupère de l'acide et le l'hydroxyde de métaux alcalins à partir de sels de métaux alcalins par séparation en milieu aqueux. Une cellule à deux compartiments utilise des membranes monovalentes à sélectivité anionique et des membranes bipolaires; une cellule à trois compartiments (1) utilise des membranes monovalentes à sélectivité anionique (3), des membranes à sélectivité cationique (4) et des membranes bipolaires (2a, 2b). Une application particulière concerne la conversion du résidu du filtre électrostatique de la chaudière de récupération d'une installation côtière et/ou fonctionnant en cycle fermé de fabrication de pâte à papier avec réutilisation du sulphate et de l'hydroxyde de sodium/potassium appauvris en chlorure.

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