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林产化学与工业

林产化学与工业 ›› 2022, Vol. 42 ›› Issue (1): 1-9.doi: 10.3969/j.issn.0253-2417.2022.01.001

• 研究报告 • 上一篇    下一篇

生物基极性非质子溶剂/对甲苯磺酸耦合体系中竹粉定向解聚研究

尹小燕1,2, 蔡婷婷1, 刘超1, 蒋剑春1,2, 王奎1,2,*()   

  1. 1. 中国林业科学研究院 林产化学工业研究所; 生物质化学利用国家工程实验室; 国家林业和草原局林产化学工程重点实验室; 江苏省生物质能源与材料重点实验室, 江苏 南京 210042
    2. 南京林业大学 江苏省林业资源高效加工利用协同创新中心, 江苏 南京 210037
  • 收稿日期:2021-12-01 出版日期:2022-02-28 发布日期:2022-03-11
  • 通讯作者: 王奎 E-mail:wangkui@icifp.cn
  • 作者简介:王奎, 研究员, 博士, 硕士生导师, 主要从事生物质热化学转化的基础和工程化应用研究; E-mail: wangkui@icifp.cn
    尹小燕(1993-), 女, 河南信阳人, 硕士生, 从事木质纤维定向解聚的研究
  • 基金资助:
    国家自然科学基金资助项目(31870714)

Directional Decomposition of Bamboo Powder in Bio-based Polar Aprotic Solvent/Aqueous p-Toluenesulfonic Acid Coupling Systems

Xiaoyan YIN1,2, Tingting CAI1, Chao LIU1, Jianchun JIANG1,2, Kui WANG1,2,*()   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
    2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
  • Received:2021-12-01 Online:2022-02-28 Published:2022-03-11
  • Contact: Kui WANG E-mail:wangkui@icifp.cn

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摘要：

以两种生物基极性非质子溶剂γ-戊内酯(GVL)和二氢左旋葡萄糖酮(Cyrene)，分别与对甲苯磺酸水溶液(TsOH aq)构成耦合体系，对竹粉定向解聚及其酶解过程开展了研究。实验结果表明：质量浓度为75 g/L的TsOH，溶剂体积比为4∶1的GVL/TsOH aq体系在130℃预处理毛竹60 min后，半纤维素和木质素分离效率更高，半纤维素分离率(SH)和木质素分离率(SL)分别达到98.5%和98.4%，同时纤维素保留率(RC)为91.5%；而质量浓度为30 g/L的TsOH，溶剂体积比为0.8∶1的Cyrene/TsOH aq体系在120℃预处理毛竹60 min后，RC达到87.3%，SH和SL仅为85.5%和79.4%。预处理后固体样品的表征结果表明：竹粉经GVL/TsOH aq预处理后的样品木质纤维致密结构被有效破坏，无定形的半纤维素和木质素绝大部分被分离，结晶度达68.27%，结构更接近于微晶纤维素，同时暴露出更多的游离羟基，有利于后续酶解。而酶解结果进一步证明：GVL/TsOH aq预处理后样品的酶解葡萄糖产率773 mg/g，显著高于Cyrene/TsOH aq预处理后样品(306 mg/g)，达到毛竹原料酶解效率的19.3倍。两种溶剂体系均可高效回收利用，其中GVL/TsOH aq体系循环使用3次后，SL仍达90.3%以上，SH不低于91.3%，RC不低于91.5%，能回收94.8%的溶剂。

关键词: 毛竹, γ-戊内酯, 二氢左旋葡萄糖酮, 对甲苯磺酸, 预处理

Abstract:

The effects of pretreatment with γ-valerolactone/p-toluenesulfonic aci aqueous solution coupling systemGVL/TsOH aq) an Cyrene/p-toluenesulfonic aci aqueous solution coupling systemCyrene/TsOH aq) on the chemical composition an enzymatic hyrolysis of maso bamboo were stuie. The results showe that the hemicellulose separation rates (SH) an lignin separation rate (SL) in GVL/TsOH aq system with 75 g/L TsOH an the solvent volume ratio of 4:1 were 98.5% an 98.4%, respectively, after pretreatment at 130℃ for 60 min, an the cellulose retention rate (RC) was 91.5%. In contrast, the Cyrene/TsOH aq system with 30 g/L TsOH an the solvent volume ratio of 0.8:1 was pretreate maso bamboo at 120℃ for 60 min, the RC was 87.3%, while the SH an SL were 85.5% an 79.4%, respectively. Characterization results of soli samples after pretreatment showe that after pretreatment with GVL/TsOH aq, the ense structure of lignocellulose of the samples was effectively estroye, an most of the amorphous hemicellulose an lignin were separate, with a crystallinity of 68.27%. Besies, the structure was closer to microcrystalline cellulose, an more free hyroxyl groups were expose, which was conucive to the subsequent enzymatic hyrolysis an saccharification process. The enzymatic hyrolysis results emonstrate that the glucose yiel of the soli sample obtaine by GVL/TsOH aq pretreatment (773 mg/g) was significantly higher than that of the sample obtaine by Cyrene/TsOH aq (306 mg/g), which was 19.3 times of that of bamboo. The two solvent systems coul be effectively recycle, an the separation rate of lignin an the retention rate of cellulose in GVL/TsOH aq system coul reach 90.3% an 91.5% respectively, an 94.8% of solvent coul be recovere after three cycles.

Key words: maso bamboo, γ-verolactone, Cyrene, p-toluenesulfonic acid, pretreatment

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