Effect of soda-ethanol cooking with caustic extraction prior to bleaching on the properties of hardwood pulp

Pulping using organic solvents is an alternative to kraft pulping and can reduce environmental pollutants. Ethanol a potential cooking liquor, as it improves the penetration of chemical due its low surface tension, be recovered via distillation. The structure alpha-cellulose content need controlled during bleaching processes prepare dissolving pulp. Therefore, effect ethanol on efficiency caustic extraction prior sequential pulp were analyzed. yield was 50.2% in liquor with 20% NaOH 50% at 160 °C for 120 min. delignification extent 83.2%, which better than that cooking. Caustic effective removing hemicellulose content, removal rate xylan 61.1% 10% added 1.5% slurry reacted 60 90 bleached could improved over 94% by process consisting chlorine dioxide, sodium hydroxide, hydrogen peroxide.