竹浆粕制备工艺条件的探讨

Study on the Process Conditions of Bamboo Dissolving Pulp Preparation

中文关键词:  竹浆粕  预水解  中和  硫酸盐法蒸煮

Key Words:bamboo dissolving pulp  pre-hydrolysis  neutralize  kraft cooking

中文摘要:

      以混合竹片为原料，采用预水解-碱液中和-硫酸盐法（KP）蒸煮-ECF漂白的工艺制备竹浆粕。通过改变预水解段的最高温度、碱液中和段的用碱量以及KP段的用碱量和蒸煮最高温度，分析不同条件成浆的性能指标，得到不同用途竹浆粕的制备工艺条件。结果显示，当预水解最高温度165℃、中和段用碱量8%～10%（以Na2O计）、KP段最高温度和用碱量分别为165℃和6%时，经OD0EPD1A漂白得到的漂白竹浆粕的性能指标最佳。其中，当预水解最高温度和KP段的蒸煮最高温度均为145℃时，蒸煮后浆料得率比预水解最高温度165℃、KP蒸煮最高温度145℃的浆料得率高6%～7%；也比预水解最高温度和蒸煮最高温度均为165℃时的浆料得率高8%～10%。当KP段用碱量分别为6%～8%和10%～12%时，漂白后的竹浆粕可用来制备醋酸纤维和黏胶纤维。

Abstract:

      The bamboo pulp was prepared from mixed bamboo slices by pre-hydrolysis, alkali solution neutralization, kraft cooking and ECF bleaching. To obtain the best conditions for the preparation of bamboo pulp,the performance of the slurry was analyzed by changing the maximum temperature of the pre-hydrolysis, the amount of alkali in the alkaline solution neutralization and the maximum temperature and amount of alkali in kraft cooking.The results showed that the best performance indicators of bleached bamboo pulp was obtained when the maximum temperature of pre-hydrolysis was 165℃, the alkali content was 8%~10% (Na2O), the maximum temperature and the amount of alkali correspond to 165℃ and 6% (Na2O) in kraft cooking, respectively.When the maximum temperature of pre-hydrolysis and the maximum cooking temperature of KP were 145℃, the yield of pulp was 6%~7% higher than that of the maximum temperature of pre-hydrolysis (165℃)and the maximum cooking temperature of kraft cooking (145℃). The bamboo pulp after bleaching could be used to prepare cellulose acetate and viscose fibers when the amount of alkali was 6% to 8% (Na2O) and 10% to 12% (Na2O) in the kraft cooking, respectively.