摘要
椰壳是一种优质活性炭原料，利用同步热重一差热分析仪（TG—DTA）对椰壳的热失重、热效应、热稳定性进行研究，分析了椰壳热解炭化的机理。作者还探讨了椰壳热解温度、升温速度对其炭化得率、分解速率的影响。实验结果表明：在5种升温条件下，椰壳热分析曲线都有两个失重阶段。热解温度区间在200-410℃之间。控制第二失重阶段是椰壳热解炭化的关键，提高升温速率在一定程度上会有利于椰壳热解反应的进行。当升温速率为20℃／min，此时分解热焓为792．15J／g，失重为31．925％。热解终温宜选择575℃。为椰壳的炭化工艺优化提供理论依据。
Coconut shell is an excellent raw material for preparation of activated carbon. Studies on weight loss, heat effect and heat stability of coconut shell were carried out by simultaneous measurements of thermogravimetry （TG） and differential thermal analysis（ DTA）, mechanisms of pyrolysis and charring of coconut shell were analyzed. The influences of pyrolysis temperature and heating rate on charring yield and decomposition rate of coconut shell were also explored. According to experimental results, all curves from thermal analysis showed two weight loss stages under the conditions of five different heating rates. Temperature range of coconut shell pyrolysis is from 200 to 410℃. Controlling weight loss of the second stage is the key for pyrolysis and charring. In a certain degree, increasing heating rate is helpful for pyrolysis of coconut shell. Under the conditions of optimum heating rate at 20℃/min, enthalpy of pyrolysis reached 792.15 kJ/g and weight loss was only 31. 925%. The optimum final pyrolysis temperature was 575℃. This study provides theoretical basis for optimizing charring technology of coconut shell.
出处
《林产化学与工业》
EI
CAS
CSCD
2006年第1期49-52,共4页
Chemistry and Industry of Forest Products
关键词
椰壳
热分析
热解
炭化
coconut shell
thermal analysis
pyrolysis
charring
