麦草低温氧碱蒸煮浆料性质的研究

麦草碱法蒸煮后,浆料不经洗涤,直接通入氧气进行处理。对麦草氧碱蒸煮段用碱量、氧压、温度和时间四因素三水平方差分析表明,用碱量对得率的影响最大,时间对其影响最小;浆料黏度下降并不明显;用碱量对浆料卡伯值的影响最大,氧压对其影响最小。在较适宜的工艺条件下氧碱蒸煮结果为:浆料得率52.6%;浆料黏度为1 042 mL/g,比单段碱法蒸煮后浆料黏度(1 099 mL/g)降低5.2%;浆料卡伯值17.9,比单段碱法蒸煮后浆料卡伯值(20.3)降低11.8%;黑液黏度为3.4 mPa.s,比单段碱法蒸煮黑液黏度(5.1 mPa.s)降低33.3%。

Properties of Wheat Straw Pulps of Alkaline-Oxygen at Low Temperature

Wheat straw after alkaline-AQ pulping was disposed with oxygen directly without washing. An L9（34） orthogonal test was designed to study the effects of alkali charge, oxygen pressure, cooking temperature and holding time on wheat straw alkaline-oxygen pulping. The result showed alkali charge had the maximum influence on yield, while holding time had the minimum influence. The declined of viscosity was not obvious, alkali charge had the maximum influence on kappa number, while oxygen pressure had the minimum influence. At the optimal conditions, the wheat straw alkaline-oxygen pulp was obtained with yield 52.6%, viscosity 1 042 mL/g, the kappa number 17.9, black liquor viscosity 3.4 mPa.s. Compared with the first stage alkaline pulping, viscosity decreased 5.2%, kappa number reduced 11.8%, black liquor viscosity decreased 33.3%.