摘要
以松木屑为原料,甲醇-水混合溶剂为液化剂,考察了不同溶液预处理对木屑表面结构以及对液化转化率的影响,同时研究了反应温度、液化时间对木屑液化效果的影响。结果表明,不同预处理方法均改变了木屑结构,其中经氢氧化钠预处理过的木屑结构破坏最大,有利于增强液化反应活性;以氢氧化钠溶液预处理木屑时,反应温度为320℃、液化时间为10 min时液化较合适,转化率达92.4%。GC-MS分析结果表明液化产物主要含有醇、醛、酮、酸、酯、酚类物质,不同的预处理对它们的含量有很大影响,未预处理过的木屑液化产物质量分数最多的是醛类物质,达到40.588%,氢氧化钠预处理和尿素预处理最多的分别是酮类和酸类物质,分别为30.878%、25.311%,而氢氧化钠与尿素共预处理木屑的液化产物中则酚类物质最多,为38.478%。
Pine sawdust was liquefied using methanol-water mixed solvent as liquid agent. The effects of the pretreatment conditions on structural changes of the surface and the liquefaction conversion rate were investigated. The effects of reaction temperature and residence time on sawdust liquefaction were studied, too. The results indicated that different pretreatment can change the sawdust structure. The sawdust pretreated by NaOH had the most structural change. This could broaden the chemical reactivity. The conversion of sawdust was 92.4 % after pretreatment of sodium hydroxide solution at 320 ℃ for 10 rain. GC-MS analysis showed that the liquid products mainly included alcohols, aldehydes, ketones, acids, esters and phenols. It was also found that pretreatment had an important effect on their contents which reached 40. 588 %. The major component of liquid product produced with sawdust was aldehyde compounds and urea yields acid compounds. Their contents were 30. 878 % and 25.311% , respectively. The sawdust pretreated by NaOH trends to formate of ketone compounds, while sawdust pretreated by mixed NaOH and urea yields about 38. 478 % phenolic compounds.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2014年第1期73-78,共6页
Chemistry and Industry of Forest Products
基金
林业公益性行业科研专项(201204801)
关键词
松木屑
预处理
液化
pine sawdust
pretreatment
liquefaction
