椰衣微波热解工艺的响应面法优化及液体产物组成分析  

Optimization of Microwave Assisted Pyrolysis of Coconut Clothes by Response Surface Method and Analysis of Liquid Product Composition

作　　者：代琪琪 魏小翠 汤宏彪 李进[1] 王晋京 DAI Qiqi;WEI Xiaocui;TANG Hongbiao;LI Jin;WANG Jinjing(College of Chemical Engineering and Technology,Hainan Provincial Fine Chemical Engineering Research Center,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学化学工程与技术学院海南省精细化工工程技术研究中心,海南海口570228

出　　处：《生物质化学工程》2020年第4期42-48,共7页Biomass Chemical Engineering

基　　金：海南省重点资助项目(ZDYF2018134)。

摘　　要：利用Box-Behnken试验设计,采用响应面法对椰衣微波热解工艺进行优化,考察了热解温度、氮气流速、升温速率和热解时间对液体产物产率的影响。试验结果表明:回归方程模型拟合较好且显著。各个因素对液体产物的产率影响的主次顺序为热解温度>氮气流速>热解时间>升温速率。最佳热解条件为热解温度550℃、氮气流速80 mL/min、升温速率20℃/min、热解时间25 min,在此条件下液体产物产率为38.28%。对液体产物的性质和组成分析发现:优化条件下得到的液体产物中含水量为14.32%,pH值为3.78,热值为24.61 MJ/kg。通过GC-MS对液体产物进行分析,最佳条件下得到的液体产物中主要含有酚、醛、酸、酮类化合物,分别为84.35%、6.01%、3.37%、2.05%,其中酚类化合物的量最高,包括苯酚(33.51%)、对甲酚(9.71%)、2-甲氧基苯酚(10.99%)和4-乙基-2-甲氧基苯酚(5.57%)。The Box-Behnken experimental design was used to optimize the microwave pyrolysis process of the coconut clothes by response surface method(RSM).The effects of microwave pyrolysis temperature,nitrogen flow rate,heating rate and pyrolysis time on liquid yield were investigated.The results showed that the regression equation model fitted well and was significant.The influence order of various factors on liquid product yield was microwave pyrolysis temperature>nitrogen flow rate>pyrolysis time>heating rate.The optimum conditions were temperature 550℃,nitrogen flow rate 80 mL/min,heating rate 20℃/min and pyrolysis time 20 min.According to this process,the obtained yield of liquid product value was 38.28%.The analyses of properties and composition of liquid product showed that the water content in the liquid product was 14.32%,the pH value was 3.78,and the maximum heating value under the best pyrolysis conditions was 24.61 MJ/kg.By GC-MS analysis of bio-oil,under the optimal conditions,the liquid product was composed of phenols,aldehydes,acids,ketones and so on,and their contents were 84.35%,6.01%,3.37%,2.05%.The phenols included phenol(33.51%),p-cresol(9.71%),2-methoxyphenol(10.99%)and 4-ethyl-2-methoxyphenol(5.57%).

关 键 词：椰衣 微波热解 液体产物 响应面法 

分 类 号：TQ35[化学工程]