蔗渣碱性亚硫酸钠法添加蒽醌和甲醛助剂制浆工艺研究

Bagasse Alkaline Sulfite Pulping with Using AQ and Formaldehyde as Additives

试验的技术路线是蔗渣用湿法堆存和湿法除髓，采用碱性亚钠－蒽醌和甲醛组合助剂法并运用慢速升温可获得满意的结果。其工艺参数及浆张物理性能为：总用碱量１２．５％（Ｎａ２Ｏ计），亚硫酸化度７３％，液比１：６，升温１８０ｍｉｎ，保温９０ｍｉｎ，蒽醌０．０５％，甲醛２．５％；白度６３．９％ＩＳＯ，硬度６．３Ｋ（锰值），浆张裂断长５６３７ｍ，不透明度９０％，撕裂指数８ｍＮ·ｍ２／ｇ，耐折度＞８００次。

Bagasse alkaline sulfite pulping with using AQ and formaldehyde as additives was studied, particularly the mechanism of the pulping and the factors affecting the brightness, yield and strength of the pulp were investigated. The experimental results showed that the pulp with a yield of about 65 %, permanganate number of 5-6, brigtness higher than 60% could be produced under the cooking conditions as the following: NaOH charge (as Na2O) 3. 37% ,-Na2SO3 charge (as Na2O) 9. 13%, HCHO charge 2. 5%; maximum temperature 160℃, time to the maximum temperature 180 min, time at the maximum temperature 90 min, and the liquor ratio 1: 6. The breaking length of the pulp with the beating degree of 31°SR and 35°SR were 5600m and 6400m respectively.