Insight into a new phenolic-leaching pretreatment on bamboo pyrolysis: Release characteristics of pyrolytic volatiles, upgradation of three phase products, migration of elements, and energy yield
Insight into a new phenolic-leaching pretreatment on bamboo pyrolysis: Release characteristics of pyrolytic volatiles, upgradation of three phase products, migration of elements, and energy yield
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深入探讨竹子热解的新型酚浸预处理：热解挥发物的释放特征、三相产物的升级、元素的迁移和能量产率
DOI：
10.1016/j.rser.2020.110444
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发表时间：
2021-02-01
影响因子：
15.9
通讯作者：
Zhou, Jianbin
中科院分区：
文献类型：
--
作者：
Chen, Dengyu;Cen, Kehui;Zhou, Jianbin
浸出基本上去除了生物质中的金属物种，并提高了热解产品的质量。然而，常见的酸溶液，如盐酸和醋酸，价格昂贵，难以回收利用。本文报道了一种新的浸出前处理方法，采用苯酚和愈创木酚溶液，这两种溶液主要存在于生物质热转化液体副产物中。研究了竹材热解产物的挥发分释放特性和热解产物的升级特性。可以得到四个关键结果。(1)与水浸相比，酚醛浸出对金属的去除效率要高得多。(2)酚醛浸出使竹材的热解行为发生了很大变化。具体地说，它促进了热解挥发分的释放，分离了半纤维素和纤维素的热解区，并消除了抽出物的热解峰。(3)酚浸出提高了三相热解产物的质量。具体地说，它抑制了酸的生成，促进了生物油中脱水糖的形成，提高了竹炭的比表面积，增加了气态产物中甲烷的体积分数。(4)随着氧和碳从竹子向生物油的迁移，生物油取代竹炭成为热解产物，能量产率增加。以上结果说明了酚醛浸出前处理在竹材热解产品升级中的重要性和应用前景。从应用的角度来看，轻质竹醋液是生物质浸出的一种选择。利用含有金属物种的竹醋滤液制备液体肥料具有潜在的效益。
Leaching essentially removes metallic species from biomass and improves the quality of pyrolysis products. However, common acid solutions, such as hydrochloric acid and acetic acid are expensive and difficult to recycle. This paper reports a new leaching pretreatment, using phenol and guaiacol solutions, which are mainly present in liquid by-products from thermal conversion of biomass. The characteristics of releasing of volatiles and upgradation of pyrolytic products of bamboo were investigated. Four key results can be obtained. (i) Phenolic leaching had much higher removal efficiency of metallic species, compared to water leaching. (ii) Pyrolytic behavior of bamboo changed drastically by phenolic leaching. Specifically, it enhanced the release of pyrolytic volatiles, separated the pyrolysis zones of hemicellulose and cellulose, and eliminated pyrolytic peak for extractives. (iii) Phenolic leaching upgraded the three phase pyrolysis products. Specifically, it inhibited the formation of acids, promoted the formation of anhydrosugars in bio-oil, improved the specific surface area of bamboo charcoal, and increased the volume fraction of methane in the gaseous products. (iv) With improved migration of oxygen and carbon from bamboo to bio-oil, the bio-oil replaced bamboo charcoal to become the pyrolysis product with increased energy yield. The above results demonstrated the importance and promise of phenolic-leaching pretreatment in upgradation of products of bamboo pyrolysis. From application perspective, light bamboo vinegar was an alternative for leaching of biomass. The use of bamboo vinegar filtrate containing metallic species had potential benefits for preparation of liquid fertilizer.