稻秸水热炭化的多轮沉积反应

doi:10.3969/j.issn.1004-1524.2018.01.18

浙江农业学报 ›› 2018, Vol. 30 ›› Issue (1): 137-143.DOI: 10.3969/j.issn.1004-1524.2018.01.18

稻秸水热炭化的多轮沉积反应

向天勇^{1, 2}, 钱广³, 朱杰³, 单胜道^{2, *}, 蓝建明¹

1.嘉兴职业技术学院,浙江嘉兴 314036;
2.浙江科技学院浙江省废弃生物质循环利用与生态处理技术重点实验室,浙江杭州 310023;
3.嘉兴学院生物与化学工程学院,浙江嘉兴 314001

收稿日期:2017-06-29 出版日期:2018-01-20 发布日期:2018-02-09
通讯作者: 单胜道,E-mail: shanshd@vip.sina.com
作者简介:向天勇(1971—),男,湖北恩施人,博士,副教授,主要从事农业废弃生物质的资源化利用技术研究。 E-mail:tyxiang2006@163.com
基金资助:
科技部国际科技合作专项欧盟项目(2014DFE90040); 浙江省重点科技创新团队(2013TD12); 浙江省自然科学基金(LY15B030008)

Multiple deposition reaction of rice straw by hydrothermal carbonization

XIANG Tianyong^{1, 2}, QIAN Guang³, ZHU Jie³, SHAN Shengdao^{2, *}, LAN Jianming¹

1. Jiaxing Vocational Technical College, Jiaxing 314036, China;
2. Key Laboratory of Recycling and Eco-Treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou 310023, China;
3. College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China

Received:2017-06-29 Online:2018-01-20 Published:2018-02-09

摘要/Abstract

摘要： 以稻草为原料,通过FT-IR(傅里叶变换-红外光谱)、XRD(X射线衍射)、元素分析等研究225~300 ℃温度条件下稻草水热炭化过程。结果表明,40 min以内为稻秸主要的失重阶段,伴随可溶性化合物的大量溶出和半纤维素的破坏,炭产物中C含量升高,表面OH、C-O-C官能团的IR吸收峰强度在短时增加后逐渐降低。在随后的反应中,水热炭的产率、表面主要官能团IR吸收峰强度及O/C随着反应进程呈现周期性的起伏变化,说明稻秸水热炭化具有多轮沉积反应的特点,即在发生聚合、芳构化反应的同时通常会伴随新一轮水解、裂解反应的发生,产生足够的可溶性底物时,又诱发新一轮的聚合沉积反应。整个反应过程中,较高的反应温度有利于加快水热炭化进程,但会导致炭产物产率降低和表面含氧官能团不同程度的损失。

关键词: 稻秸, 水热炭化, 多轮沉积反应

Abstract: The dynamical processes in the hydrothermal carbonization (HTC) of rice straws at 225-300 ℃ were investigated and monitored by elementary analysis, FT-IR (Fourier transform-infrared spectroscopy) and XRD (X-ray diffraction). It was shown that within 40 minutes, the main weight losses occurred as a result of the dissolution of a large number of soluble compounds, and the relative contents of C-O-C and OH functional groups in products increased first and then decreased in the initial stage of reaction, C contents increased and O/C decreased as induced by the destruction of hemicellulose and amorphization of cellulose. In subsequent HTC process, biochars yields, relative contents of functional groups and compositions of the elements showed a periodic fluctuation, indicating the characteristic and mechanism of multiple deposition reaction. Generally, the polymerization and aromatization reactions occurred with the occurrence of a new round of hydrolysis and cracking reactions, resulting in a sufficient amount of soluble substrate to induce a new round of polymerization and deposition reaction. Increasing the reaction temperature is beneficial to the aromatization of solid phase products and would shorten the HTC process, but also would reduce yields and the oxygen-containing functional groups of biochars in some degree.

Key words: rice straw, hydrothermal carbonization, multiple deposition reaction

中图分类号:

TQ127.1

向天勇, 钱广, 朱杰, 单胜道, 蓝建明. 稻秸水热炭化的多轮沉积反应[J]. 浙江农业学报, 2018, 30(1): 137-143.

XIANG Tianyong, QIAN Guang, ZHU Jie, SHAN Shengdao, LAN Jianming. Multiple deposition reaction of rice straw by hydrothermal carbonization[J]. , 2018, 30(1): 137-143.

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稻秸水热炭化的多轮沉积反应

Multiple deposition reaction of rice straw by hydrothermal carbonization

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