ANAEROBIC DIGESTION OF PULP

Hou Zhe sheng, Huo Man tang, Dai Chuan bo, Wang Ben, Fang Yan zhao Xue Da liang, Li Yi

ABSTRACT:Alkaline pulping produces a large amount of black liquor and volatile substances, such as methanol, dimethyl sulfide, terpene, ketone, etc. It can cause serious pollution of water and air. Anaerobic inhibition with lignin in cooking is nucleophilic reaction, thus inhibiting hair lignin base and help base groups, to reduce the color of black liquor, increase the pulps whiteness, reduce the produce of the volatile matter quality at the same time. Compared with non-oxygen and aerobic cooking black liquor, the residual alkali concentration of the former was increased by 33%, the PH was increased by 0.9, the chroma decreased by 22.3%, and the solids decreased by 23%. In the former, the ash content of the pulp was reduced by 67%, and the amount of alpha – cellulose increased by 5% and the brightness increased by 13%.

Keywords:Alkaline pulping, black liquor, anaerobic cooking, nucleophilic reaction.