摘要
为了提高生物质秸秆的溶解率、优化秸秆组分再分布,采用1-丁基-3-甲基咪唑氯盐([Bmim]Cl)和1-乙基-3-甲基咪唑醋酸盐([Emim][OAc])的二元离子液体混合体系,考察溶剂组成、反应温度和处理时间三因素对预处理的影响。结果表明,随着[Bmim]Cl在二元离子液体中摩尔比的升高,秸秆溶解率呈先上升后下降的趋势;纤维素在处理后秸秆中所占比例也遵循此规律。随着温度升高,溶解率逐渐增加,当温度超过100℃时,二元离子液体溶解液的黏度发生突变,秸秆发生变性;此外,随着处理时间的延长,溶解率逐渐升高,但是超过3h以后,溶解效果提升并不明显。综合各因素作用效果,确定最佳反应温度为90℃,最佳处理时间3h。在此条件下,秸秆的溶解率达到46.53%,经处理后秸秆中纤维素比例达到55.77%。
In order to promote biomass dissolution and optimize distribution of cornstalk components,1-butyl-3-methylimdazolium chloride([Bmim]Cl)and 1-ethyl-3-methylimidazolium acetate([Emim][OAc])were used.Effect of solvent ratio,temperature and time on pretreatment was investigated.As a result,with the rise of[Bmim]Cl,cornstalk dissolution shows an inverted'V'change tendency,and the same trend occurs to cellulose content in pretreated cornstalk.Furthermore,the dissolution rate increases with the time and temperature.However,when the temperature was over 100℃,the physical properties of dissolution system would change dramatically.Besides,more than 3htreatment would not improve the dissolution performance.So the optimal condition is 90℃,3h.Under these conditions,dissolution of cornstalk is up to 46.53%,and cellulose in pretreated cornstalk is also concentrated to 55.77%.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2013年第S1期66-72,共7页
CIESC Journal
基金
国家自然科学基金项目(21210006
21336002)
国家高技术研究发展计划项目(2012AA063001)
北京市重点基金项目(2131005)~~
关键词
二元
离子液体
生物质
秸秆
预处理
溶解
binary
ionic liquids
biomass
cornstalk
pretreatment
dissolution
