摘要
对在木糖脱水环化生产糠醛的过程中应用超临界CO2(SC-CO2)流体萃取技术进行了研究。取质量分数5.0%木糖680 g、质量分数5.0%稀硫酸6.8 g,使用SC-CO2作萃取剂时,SC-CO2流量0.10 g/s,170℃反应180 min,与不使用SC-CO2相比,木糖的转化率提高2.4个百分点、糠醛的选择性提高29.8个百分点、糠醛收率提高23.4个百分点。实验条件下,采用SC-CO2作萃取剂时,SC-CO2温度(35±1)℃,压力(16±0.5)MPa,木糖脱水环化较适宜的反应温度为180℃,SC-CO2流量0.10 g/s,反应180 min,糠醛收率可达63.0%。
The supercritical carbon dioxide fluid extraction technology was used in the furfural production process by dehydration and cyclization of xylose.Under the conditions of feeding mass fraction 5.0％ xylose 680 g and mass fraction 5.0％ dilute sulfuric acid 6.8 g,with the flow rate of SC-CO2 extractant 0.10 g/s and reaction for 180 min.under 170 ℃,the conversion of xylose increased 2.4 percent point.The selectivity of furfural increased 29.8 percent point and the furfural yield increased 23.4percent point,compared with that without using SC-CO2.Under experiment conditions with SC-CO2 as extractant,SC-CO2 temperature （35 ± 1） ℃,pressure （16 ± 0.5） MPa,the optimum xylose dehydration and cyclization reaction temperature 180 ℃,the flow rate of SC-CO2 extractant 0.10 g/s,and reaction time 180 min,the furfural yield was up to 63.0％
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2013年第6期106-110,共5页
Chemistry and Industry of Forest Products
基金
湖南省教育厅高等学校科研项目(12C1047)
关键词
超临界CO2流体
萃取
反应精馏
糠醛
木糖
supercritical CO2 fluid
extraction
reaction distillation
furfural
xylose
