摘要
本文提出了一种新的纯化杨木乙醇黑液木质素的方法——温和酸解纯化法。对比了纯化前后木质素的纯度、有机元素含量和高位发热量,并采用红外光谱仪和热重分析仪对纯化后木质素的官能团和热失重特性进行了分析。结果表明,温和酸解法能很好地纯化杨木乙醇黑液木质素,可以将木质素的纯度从98.75%提高到99.81%。纯化后木质素的理论结构式为C10H11.07O3.13N0.02,实测高位发热量为23.76 MJ/kg。杨木乙醇黑液木质素的热失重始于157℃,并在400℃时出现最大失重峰,终了失重率为64.35%。乙醇黑液木质素纯度高,富含酚羟基、羰基、甲氧基和酯键等活性基团,是一种宝贵的生物质资源,有待进一步的资源化利用。
Aspen was pulping with alcohol in the best conditions, and then mild acidolysis purification was used to purify the obtained aspen Aleell lignin. Comparative studies of purity, organie elements and higher heating value were done between the impure and purified aspen Alcell lignin, and FT -IR spectra and thermal gravimetric analysis （TGA） were also used to character the chemical structure and thermochemical property of the purified aspen Alcell lignin. The results showed that the mild acidolysis purification was a propert method to purify aspen Alcell lignin, it could increase the purity of the lignin fi＇om 98.75% to 99.81%. Through the elemental analysis, the theo- retical chemical formula C10H11.07O3. 13N0.02 was given, and the tested higher heating value was 23.76 MJ/kg. The weight loss of the purified aspen Alcell lignin began at 157℃, the maximum weight loss peak was occurred at 400℃, and the final weight loss rate was 64.35%. The aspen Alcell lignin was riched in phenolic hydroxyl groups, carbonyl groups, methoxy groups, ester bonds and other reactive groups, and it was a valuable raw material resource, pending a further resource utilization.
出处
《造纸科学与技术》
北大核心
2014年第6期7-10,15,共5页
Paper Science & Technology
基金
国家"973"计划项目(2013CB228101)
国家自然科学基金项目(31270635
21176095)
关键词
乙醇黑液木质素
温和酸解
离子色谱
理化特性
Alcell lignin
mild acidolysis
ion chromatography
physicochemical properties
