【摘要】 由中温沥青制备活性炭的工艺流程,预处理过程存在热处理时间长、沥青破碎困难的问题,通过将沥青附载于玉米秸秆上,采用空气氧化法进行热处理,可以较好地解决上述问题。实验考察了热聚合法和空气氧化法两种热处理工艺对活性炭吸附性能的影响,发现空气氧化法效果优于热聚合法,其适宜的热处理条件为温度400℃,时间2h。对活化工艺的研究结果表明活化时碱炭比为5∶1、炭料粒度100目、活化温度在800℃~900℃、活化时间在1h~1.5h,所制活性炭吸附性能高、且稳定。更多还原

【Abstract】 Medium coal tar pitch was loaded onto porous corn stalks by solution soaking, and the resulting composite was oxidatively stabilized at 400℃ for 2h in air or heat-treated under nitrogen in the same conditions to make an infusible pitch. The infusible pitch was shattered, mixed with KOH and activated at 800℃ for 0.5 to 2h to prepare activated carbons, which were characterized by iodine adsorption. It was found that the time for the oxidative stabilization was significantly shortened by loading pitch onto the corn stalks. When the oxidative stabilization was performed at 400℃ for 2h in air, the particle size was above 100 mesh, the ratio of alkali to the infusible pitch was 5∶1. After activation at 800℃ for 1h, the activated carbon obtained had the highest iodine adsorption value.更多还原