水洗及酸洗对毛竹热解产物的影响

Effect of water and acid leaching on pyrolysis products of Phyllostachys pubescens

为了探讨竹材资源的加工利用途径,以毛竹为原料,分别采用去离子水和质量分数为3%的H2SO4溶液对毛竹进行水洗或酸洗预处理.采用一喷动式流化床热解炉对毛竹原料和水洗或酸洗预处理样品进行热解实验,考察升温速率、热解终温温度、水洗或酸洗预处理时间等对热解产物和液相产物组成分布的影响.热解结果表明,在不同升温速率和热解终温下,毛竹热解过程明显不同.经水洗或酸洗预处理后的毛竹样品热解结果显示,水洗使毛竹热解生成的固体产物得率降低而液体产物得率升高,造成了液体产物中有机小分子及苯酚质量分数的升高,且随水洗时间的延长而加强.酸洗促进了固体产物的生成,表明酸具有催化热解过程中脱水反应的作用.水洗及酸洗显著提高了液体产物中糠醛的质量分数.

In order to deve pretreated by water and 3 lop the utilization technology of bamboo materials, Phyllestachys pubescens was %（mass fraction） sulfuric acid leaching, and then pyrolyzed in a spouted fluid- ized-bed furnace. The effect of heating rate, pyrolysis temperature, water or acid leaching time on pyroly- sis products and component distribution of liquid product was investigated. Pyrolysis results show that Phyllestachys pubescens undergoes different pyrolysis process at different heating rates and pyrolysis tem- peratures. Product analysis of pretreated sample pyrolysis indicates that water leaching depresses the for- mation of char and promotes the yield of liquid product, also increases the mass fractions of organic light molecules and phenol in liquid product. The influence becomes greater as water leaching time is prolonged. Acid leaching promotes the formation of char, which indicates that acid catalyzes dehydration reaction dur- ing pyrolysis. Both water and acid leaching obviously increase furfural mass fraction in liquid product.