咪唑类离子液体对木质纤维预水解液的脱毒

doi:10.11949/j.issn.0438-1157.20151345

化工学报 ›› 2016, Vol. 67 ›› Issue (4): 1490-1496.DOI: 10.11949/j.issn.0438-1157.20151345

咪唑类离子液体对木质纤维预水解液的脱毒

杨金龙¹, 荣亚运¹, 高露¹, 朱均均^1,2, 徐勇^1,2, 勇强¹, 欧阳嘉¹, 余世袁^1,2

1. 南京林业大学化学工程学院, 江苏南京 210037;
2. 江苏省生物质绿色燃料与化学品重点实验室, 江苏南京 210037

收稿日期:2015-08-25 修回日期:2015-09-29 出版日期:2016-04-05 发布日期:2016-04-05
通讯作者: 朱均均
基金资助:
国家自然科学基金项目(31100432);"十二五"国家科技支撑计划项目(2015BAD15B09);江苏高校优势学科建设工程资助项目。

Detoxification of lignocellulosic prehydrolyzate using imidazolium-based ionic liquid

YANG Jinlong¹, RONG Yayun¹, GAO Lu¹, ZHU Junjun^1,2, XU Yong^1,2, YONG Qiang¹, OUYANG Jia¹, YU Shiyuan^1,2

1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China;
2. Jiangsu Key Laboratory of Biomass-based Green Fuel and Chemicals, Nanjing 210037, Jiangsu, China

Received:2015-08-25 Revised:2015-09-29 Online:2016-04-05 Published:2016-04-05
Supported by:
supported by the National Natural Science Foundation of China (31100432), the National Key Technology Research and Development Program of China (2015BAD15B09) and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘要/Abstract

摘要：

针对燃料乙醇生物炼制过程中抑制物对酵母乙醇发酵的抑制作用,以水洗稀酸蒸汽爆破预处理玉米秸秆得到的预水解液为研究对象,采用新型绿色脱毒技术——离子液体进行萃取脱毒,研究比较了两种咪唑类离子液体[烷基咪唑六氟磷酸盐离子液体[C_nmim][PF₆](n 4,6,8)和烷基咪唑四氟硼酸盐离子液体[C_nmim][BF₄](n 6,8)]对预水解液的萃取性能。结果表明,随着咪唑类离子液体阳离子烷基链长度的增加,离子液体对抑制物的萃取性能下降,具有更强电负性的阴离子为BF₄^-的离子液体比阴离子为PF₆^-的离子液体萃取效率更高。通过比较糖与抑制物的萃取率,最终选择[C₈mim][BF₄]作为预水解液的萃取剂,结果显示其对主要抑制物甲酸、乙酸、5-羟甲基糠醛的萃取率分别为53.22%、47.53%和85.13%,总酚的萃取率为65.05%,而糖的损失率在6%以内。

关键词: 离子液体, 生物质, 生物燃料, 抑制物, 萃取, 脱毒

Abstract:

Aiming at the effect of inhibitors on yeast ethanol fermentation during the fuel ethanol biorefinery process, a new green detoxification technology-ionic liquid extraction was developed for detoxification of the prehydrolyzate obtained from washed acid-catalyzed steam-exploded corn stover (ASC). The extractive performances of two kinds of imidazolium-based ionic liquids (alkylimidazolium hexafluorophosphate [C_nmim][PF₆](n = 4,6,8) and alkylimidazolium tetrafluoroborate [C_nmim][BF₄](n = 6,8)) for the ASC prehydrolyzate were investigated and compared. The results indicated that the extraction efficiency of the inhibitors decreased with the increase of alkyl chain length on the cation of ionic liquids. Ionic liquid with PF₆^- anion had much higher extraction efficiency for the inhibitors than those with PF₆^-anion because of the stronger effective charge in BF₄^-. Compared to the extraction efficiency of sugars and inhibitors, [C₈mim][BF₄] was selected as the extractant for detoxification of the ASC prehydrolyzate. Its detoxification results indicated that 85.13% of 5-hydroxymethylfurfural, 53.22% of formic acid, 47.53% of acetic acid and 65.05% of total phenols could be removed, while the loss of sugars was less than 6%.

Key words: ionic liquid, biomass, biofuel, inhibitor, extraction, detoxification

中图分类号:

TQ353

杨金龙, 荣亚运, 高露, 朱均均, 徐勇, 勇强, 欧阳嘉, 余世袁. 咪唑类离子液体对木质纤维预水解液的脱毒[J]. 化工学报, 2016, 67(4): 1490-1496.

YANG Jinlong, RONG Yayun, GAO Lu, ZHU Junjun, XU Yong, YONG Qiang, OUYANG Jia, YU Shiyuan. Detoxification of lignocellulosic prehydrolyzate using imidazolium-based ionic liquid[J]. CIESC Journal, 2016, 67(4): 1490-1496.

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咪唑类离子液体对木质纤维预水解液的脱毒

Detoxification of lignocellulosic prehydrolyzate using imidazolium-based ionic liquid

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