摘要
以甘油为液化促进剂,在酸性催化剂条件下对微晶纤维素的亚临界液化工艺进行考察。实验结果表明:浓硫酸是较好的酸性催化剂,在微晶纤维素、浓硫酸、甘油和乙醇的质量比为1∶0.025∶2.5∶5,反应温度250℃,反应时间1h的条件下,转化率可达95.7%。对液化产物的理化性能进行分析,粘度509.3mm2/s、酸值2.51mgKOH/g和羟值784.6mgKOH/g。通过红外光谱(IR)、GC-MS、1H NMR等技术手段对产物进行分析表征。结果表明,产物含有丰富的羟基基团,粘度适宜,适用于聚氨酯发泡体系。对液化机理进行探讨。
Liquefication of cellulose in subcritical ethanol using acid catalyst had been studied. It was found that sulfuric acid could provide efficient catalytic performance. Under the optimum conditions for liquefication of mass ratio of cellulose, sulfuric acid, glycerol and ethanol -- 1： 0. 025： 2.5： 5, reaction temperature of 250℃ , reaction time lh, the conversion of cellulose was up to 95.7%. The physical-chemical properties had been studied. The viscosity of hydrolytic product was 509.3mm2/s, the acid number was 2.51mgKOH/g and hydroxyl number was 784.6mgKOH/g. The liquefied product was characterized by IR, GC-MS, I H NMR. The results show the liquefied product has abundant hydroxy radicals, which could be used to make rigid polyurethane foam. The mechanism for cellulose was also discussed.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第2期249-252,共4页
Acta Energiae Solaris Sinica
基金
公益性行业专项经费(200904008)
关键词
纤维素
亚临界
液化
多元醇
cellulose
subcritical
liquefication
polyol
