Wood pulping with amine and transition metal pretreating

Details Wood pulping with amine and transition metal pretreating Wood pulping with amine and transition metal pretreating

D - Textiles, Paper

21

C

9/16

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

Patent

CA 1076758

WOOD PULPING WITH AMINE AND TRANSITION METAL PRETREATMENT Abstract of the Disclosure A method is described for increasing the yield or quality of pulp obtained from an alkaline pulping process. A lignocellulosic material, such as wood chips, is first pre- treated with an aqueous solution containing from 0.1 to 10% by weight of a water soluble lower aliphatic amine, preferably monoethanolamine, methylamine or dimethylamine and from 0.01 to 1% by weight of a water-soluble transition metal salt at elevated temperature and pressure in a closed vessel. This pretreated material is then subjected to conventional alkaline pulping, preferably soda or two-stage soda-oxygen pulping.

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