WOOD PULPING WITH AMINE AND TRANSITION METAL PRETREATING

摘要

WOOD PULPING WITH AMINE AND TRANSITION METAL PRETREATMENT 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 pretreated 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.