Simultaneous catalytic esterification of carboxylic acids and acetalisation of aldehydes in a fast pyrolysis bio-oil from mallee biomass
Simultaneous catalytic esterification of carboxylic acids and acetalisation of aldehydes in a fast pyrolysis bio-oil from mallee biomass
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DOI：
10.1016/j.fuel.2011.03.025
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发表时间：
2011-07-01
期刊：
影响因子：
7.4
通讯作者：
Li, Chun-Zhu
中科院分区：
文献类型：
--
作者：
Li, Xiang;Gunawan, Richard;Li, Chun-Zhu
本文报道了使用商业Amberlyst-70催化剂在70和170摄氏度之间的温度下用甲醇同时催化酯化和缩醛化生物油。采用流化床热解反应器，在快速升温条件下，对硬木类生物质进行热解制备生物油。结果表明，随着反应温度、反应时间和催化剂用量的增加，轻质有机酸和醛转化为酯和缩醛的转化率显著增加。然而，一些缩醛（例如二甲氧基甲烷）可以在较高的操作温度（> 110 ° C）和催化剂负载（> 6 wt.%）下分解。生物油的中重馏分也与甲醇反应，当它们的反应性含O官能团稳定时，导致它们的挥发性增加（或沸点降低）。生物油与甲醇之间的酸催化反应也降低了生物油反应产物的结焦倾向。(c)2011爱思唯尔有限公司版权所有。
This paper reports the simultaneous catalytic esterification and acetalisation of a bio-oil with methanol using a commercial Amberlyst-70 catalyst at temperatures between 70 and 170 degrees C. The bio-oil was prepared from the pyrolysis of mallee woody biomass in a fluidised-bed pyrolysis reactor under the fast heating rate conditions. Our results show that the conversion of light organic acids and aldehydes to esters and acetals rises significantly with increasing temperature, reaction time and catalysts loading. However, some acetals (e.g. dimethoxymethane) could decompose at higher operating temperatures (> 110 degrees C) and catalyst loadings (> 6 wt.%). The medium and heavy fractions of bio-oil also reacted with methanol to result in increases in their volatility (or decreases in boiling points) when their reactive O-containing functional groups were stabilised. The acid-catalysed reactions between bio-oil and methanol also decreased the coking propensity of the bio-oil reaction products. (c) 2011 Elsevier Ltd. All rights reserved.