林业科学Issue(11)：115-121,7.DOI:10.11707/j.1001-7488.20141116
微波辅助杨木快速苯酚液化及产物表征
Rapid Wood Liquefaction with Phenol by Microwave Heating and Product Characterization
摘要
Abstract
A method for fast poplar wood liquefaction in phenol by using microwave energy was successfully developed. The optimum conditions for microwave-assisted poplar wood liquefaction in phenol are as follows: moisture content 30% -40%,reaction time 15 min,phenol to wood (P/W) ratio 2. 5,wood powder diameter 0. 18 -0. 25 mm,and liquefaction yield 87%. It was proved that microwave improved the liquefaction rate at least 6 times faster than conventional heating. Wood was degraded to low molecular weight substances including alcohols, acids, ether, aldehyde and phenolic compounds. Viscosity of liquefied wood products was remarkably decreased from 8 250 mPa·s to 3 015 mPa·s. And 100 g of liquefied wood reacted with about 2. 1 mol of formaldehyde. There were only seven main conpounds,including phenol,2,3-butanediol,1,2-propanediol,2-ethoxy-propane,1,1-diethoxy-ethane,diisopropyl formal and 12-crown-4 in diethyl ether-soluble portions from liquefied wood products. It was concluded that the reaction mechanism was somewhat different between microwave-assisted and traditional wood phenolation. Cellulose and hemicellulose were firstly degraded into monosaccharides. And monosaccharides could be further cracked into 2,3-butanediol,1,2-propanediol,ethylene glycol and ethanedial,and so on. These substances reacted with each other and converted to 2-ethoxy-propane,1,1-diethoxy-ethane,diisopropyl formal and 12-crown-4.关键词
微波加热/杨木/苯酚液化/产物表征Key words
microwave heating/poplar/phenolation/product characterization分类
化学化工引用本文复制引用
李改云,朱显超,邹献武,向琴,何玉婵..微波辅助杨木快速苯酚液化及产物表征[J].林业科学,2014,(11):115-121,7.基金项目
国家林业局“948”项目(2012-4-28)。 （2012-4-28）
