超声波辅助木片常压浸渍及其漂白

采用化学热磨机械浆（CTMP）工艺，以桉木与杨木2种木材为原料，初步研究了超声波辅助木片常压浸渍及其漂白效果。通过监测体系中的残余氢氧化钠的量来探究外部环境体系（温度、时间和用碱量）对超声波辅助木片常压浸渍的影响，结果表明：超声波辅助处理浸渍，桉木为温度75℃，时间30 min，用碱量6%；杨木为温度75℃，时间30 min，用碱量5%，此较优条件下，桉木白度提高2.83%（ISO），残余过氧化氢质量分数提高了4.4个百分点，碱吸收量达41.5 kg/t，较未经超声波处理后的桉木的碱吸收量提高了5.06%；杨木白度无变化，而残余过氧化氢质量分数提高了2.73个百分点，碱吸收量达38.75 kg/t，较未经超声波处理的杨木碱吸收量提高了6.15%。

Analysis of Ultrasonic Assisted Wood-chip Impregnation at Atmospheric Pressure and Bleaching

The ultrasound assisted impregnation at atmospheric pressure and its bleaching properties were studied with eucalyptus and poplar as raw materials by chemical thermomechanical pulp(CTMP) process. The effects of external factors such as impregnation temperatures, impregnation time and impregnation alkali amount on ultrasound assisted impregnation system were explored by continuously monitoring the change of amount of liquid absorbed and residual sodium hydroxide in impregnation system. The experimental results show that the optimum conditions for ultrasonic assisted impregnation were the temperature of 75℃, the time of 30 min and the alkali amount of 6% for eucalyptus, and the temperature of 75℃, the time of 30 min and the alkali amount of 5% for poplar. In this case, for eucalyptus, the brightness increased by 2.83%(ISO) and the residual hydrogen peroxide content increased by 4.4 percent point, the alkali absorption was 41.5 kg/t, which was 5.06% higher than that without ultrasonic treatment; for poplar, the brightness didn't change, the residual hydrogen peroxide content increased by 2.73 percent point and the alkali absorption was 38.75 kg/t, which was 6.15% higher than that without ultrasonic treatment.