Influence of the operating conditions in the acetone pulping of wheat straw on the properties of the resulting paper sheets.
Influence of the operating conditions in the acetone pulping of wheat straw on the properties of the resulting paper sheets.
复制标题
麦草丙酮制浆操作条件对所得纸张性能的影响。
DOI：
10.1016/s0960-8524(01)00033-5
复制
发表时间：
2001
影响因子：
11.4
通讯作者：
A. Chica
中科院分区：
文献类型：
--
作者：
L. Jiménez;J. García;I. Pérez;J. L. Ferrer;A. Chica
采用中心复合因子设计考察了麦草丙酮法制浆过程中自变量的影响（处理温度、时间和丙酮浓度）对所得纸浆的产率以及对纸张的各种物理性质的影响（断裂长度，拉伸，破裂指数，撕裂指数和亮度）。获得了将每个因变量与不同自变量相关联的方程，在140-180 ℃、60-120分钟和40- 80%丙酮浓度范围内，分别获得了产率、断裂、拉伸、耐破指数和亮度的实验结果，误差小于20%。获得纸张的最佳断裂长度、拉伸、破裂指数和撕裂指数（分别为3456 m、1.42%、1.36 kN/g和3.86 mNm 2/g）需要使用高温;处理时间和丙酮浓度仅影响拉伸，其优化需要使用短时间和低浓度。在较低的温度、较短的时间和中等的丙酮浓度下可获得最佳的白度（30.44%）。为了在回收和再循环过程中最大限度地减少溶剂的损失，同时确保纸张性能的可接受水平，可以使用高温、低丙酮浓度和短时间;因此获得的亮度水平仅比最佳值低10%。
A central composite factor design was used to examine the influence of independent variables in the acetone pulping of wheat straw (processing temperature, time, and acetone concentration) on the yield of the resulting pulp, and on various physical properties of paper sheets (breaking length, stretch, burst index, tear index and brightness) obtained from it. Equations that related each dependent variable to the different independent variables were obtained, and these reproduced the experimental results for the yield, breaking, stretch, burst index and brightness obtained at temperatures, times, and acetone concentrations over the ranges 140–180°C, 60–120 min and 40–80%, respectively, with errors less than 20%. Obtaining the optimum breaking length, stretch, burst index and tear index for the paper sheets (3456 m, 1.42%, 1.36 kN/g and 3.86 mNm2/g, respectively) entails using a high temperature; the processing time and acetone concentration only influence stretch, optimization of which requires using a short time and a low concentration. The optimum brightness (30.44%) is achieved with a low temperature, a short time and a medium acetone concentration. In order to minimize losses of solvent during its recovery and recycling while ensuring acceptable levels of the properties of the paper sheets, a high temperature, a low acetone concentration and a short time can be used; the brightness level thus obtained is only 10% lower than the optimum value.