Increasing alkaline pulping yield for softwood with metal ions

Details Increasing alkaline pulping yield for softwood with metal ions Increasing alkaline pulping yield for softwood with metal ions

D - Textiles, Paper

21

C

D21C 1/06 (2006.01) D21C 3/02 (2006.01)

Patent

CA 2745466

Impregnating or spraying softwood chips in a solution containing an appropriate concentration of alkaline earth metal ions selected from the group consisting of calcium ions, barium ions and strontium, preferably calcium ions, at room temperature before a reductive alkaline pulping process, for example kraft pulping, significantly increases pulp yield. Using an agent that complexes with the metal ions, such as hydroxyethylidene diphosphonic acid (HEDP) allows this benefit of metal ions to be achieved during the pulping process rather than in a separate impregnation step.

Linvention concerne limprégnation ou la pulvérisation de copeaux de bois de résineux avec une solution contenant une concentration appropriée dions de métaux alcalino-terreux choisis dans le groupe constitué par les ions calcium, les ions baryum et le strontium, de préférence les ions calcium, à température ambiante avant un procédé de mise en pâte alcaline réductrice, par exemple de mise en pâte kraft, qui augmente significativement le rendement de mise en pâte. Lutilisation dun agent qui forme un complexe avec les ions métalliques, tel que lacide hydroxyéthylidène diphosphonique (HEDP) permet dobtenir ce bénéfice des ions métalliques pendant le procédé de mise en pâte plutôt que lors dune étape dimprégnation distincte.

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