木聚糖与果胶热解液化特性研究  

LIQUEFACTION CHARACTERISTICS OF XYLAN AND PECTIN PYROLYSIS

作　　者：辛善志[1,2] 杨海平[2] 米铁[1] 王贤华[2] 陈汉平[2] 

机构地区：[1]江汉大学工业烟尘污染控制湖北省重点实验室,武汉430056 [2]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《太阳能学报》2015年第8期1939-1946,共8页Acta Energiae Solaris Sinica

基　　金：江汉大学工业烟尘污染控制湖北省重点实验室开放基金(HBIK2012-04)

摘　　要：为了解不同类型多聚糖的快速热解机理，采用固定床研究反应温度（250～950℃）对木聚糖与果胶热解特性及其产物分布的影响。研究表明，果胶比木聚糖更易于分解，其分解温度低于250℃；两者解聚之后的单糖并不稳定，容易进一步裂解成小分子碎片。在低温条件下，木聚糖热解时生成的酸类化合物种类较多，其中乙酸和丙酸含量较高；果胶热解时生成的乙酸和糠醛明显高于木聚糖。果胶热解生成的CO2高于木聚糖，而后者的CO产率高于前者；在450℃以下时，CO主要来自于单糖裂解时的初级反应，与酸、酮等小分子同时生成；随着反应温度的升高，CO主要来自于丙酸、酮类小分子的脱羰基过程。In order to understand the fast pyrolysis mechanism of different types of polysaccharides in depth, the effect of reaction temperature on the pyrolysis characteristics and product distribution of xylan and pectin was conducted in a fixed bed reactor with temperature ranging from 250-950 ℃. The results indicate that pectin decomposes more easily than xylan and the initial decomposition temperature of pectin is lower than 250 ℃. Monosaccharides from xylan and pectin are thermally unstable and can decompose further into small molecular fragments. At low temperature, the decomposition of xylan gives rise to the formation of various acids, among which content of acetic acid and propionic acid are higher. The yield of acetic acid and furfural of pectin pyrolysis is much higher than that of xylan. The CO2 yield of pectin pyrolysis is higher than xylan, but CO yield of pectin is less than xylan. As temperature is lower than 450 ℃, CO is mainly originated from the primary decomposition of monosaccharides along with the formation of acids and ketones etc. small molecules. With the temperature increasing further, CO is mainly derived from the decarbonylation of low molecular compounds, such as propionic acid and ketones.

关 键 词：木聚糖 果胶 快速热解 乙酸 糠醛 

分 类 号：TK6[动力工程及工程热物理—生物能]