落叶松碱性亚硫酸盐-蒽醌法漂白化学浆的研究

Alkaline Sulfite-anthraquinone Pulping and Bleaching from Larch

本文研究了在最高温度为170℃时,落叶松AS-AQ法制浆的适宜蒸煮条件,并进行了CEHAP及CEHChP两种流程的漂白试验。结果表明,漂白浆的白度和强度两项指标均优于部颁1号漂白硫酸盐浆的标准,且浆的返黄值较低。

Alkaline sulfite- anthraquinone pulping and bleaching from larch were studied. The properties of unbleached chemical pulp are as follows:brightness 28. 7%ZBD,yield 45. 2%,Kappa number 36. 9,at the pulping conditions.total chemical charge(Na2SO3+NaOH)30% as NaOH,alkali ratio[Na2SO3/(Na2SO3+ NaOH)]0. 85 as NaOH,AQ 0. 1 % on dry wood,max. temperature 170℃, 6 hours at 170℃-The pulp yield after bleaching 38. 8%,brightness 87. 5% ZBD,intrinsic viscosity 768 ml/g,breaking length 6460m,and yellowing value 0. 97 were obtained by CEHAP sequence. The pulp yield after bleaching 39. 6%,brightness 87. 4% ZBD,intrinsic viscosity 772 ml/g,breaking length 6500m and yellowing value 0. 97 were obtained by CEHCh(chelate)P sequence.