Effects of Alkali/Alkaline Earth Metals on Fast Pyrolysis of Pine Sawdust

doi:10.19894/j.issn.1000-0518.210037

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (02): 289-297.DOI: 10.19894/j.issn.1000-0518.210037

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Effects of Alkali/Alkaline Earth Metals on Fast Pyrolysis of Pine Sawdust

Rui WANG¹, Ming-Yang GAO², Jing-Pei CAO¹^,²()

^1.Department of Chemical Engineering, Shanxi Engineering Vocational College, Taiyuan 030009, China
^2.School of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, China

Received:2021-01-21 Accepted:2021-05-14 Published:2022-02-10 Online:2022-02-09
Contact: Jing-Pei CAO
Supported by:
Key Projects of National Key R& D Plan and Intergovernmental International Scientific and Technological Innovation Cooperation(2017YFE0124200);National Natural Science Foundation of China(U1710103)

Abstract

Abstract:

The effect of alkali/alkaline earth metals (AAEM) on biomass pyrolysis and the composition of pyrolysis products can provide important theoretical basis for the study of biomass pyrolysis characteristics and the efficient utilization of pyrolysis products. In this paper, pine sawdust was used as pyrolysis raw materials, and the acid washed sample was soaked with potassium, calcium, sodium and magnesium chloride solution, respectively. The samples were rapidly pyrolyzed at 500℃under Ar atmosphere. The influence of four metal ions on the composition and distribution of pine sawdust pyrolysis products was investigated. The pyrolysis characteristics of each sample were investigated by thermo-gravimetric analysis. The tar components of the fast pyrolysis were investigated by gas chromatography/mass spectrometry (GC/MS). The results show that: AAEM has obvious catalytic effect on pine sawdust, the existence of AAEM ions can improve the yield of pyrolysis gas and solid, reduce the yield of tar; AAEM can reduce the pyrolysis temperature and make the pyrolysis easier; the tar components of fast pyrolysis mainly include phenols, ketones, aldehydes, aromatics, alcohols, dehydrated sugars, furans, acids and AAEM will cause changes in the relative contents of these substances, especially furans and aromatics. These experimental results provide an important reference for optimizing the pyrolysis conditions of biomass and improving the quality of pyrolysis bio-oil.

Key words: Pine sawdust, Fast pyrolysis, Alkali/alkaline earth metal, Bio-oil

CLC Number:

O614

Rui WANG, Ming-Yang GAO, Jing-Pei CAO. Effects of Alkali/Alkaline Earth Metals on Fast Pyrolysis of Pine Sawdust[J]. Chinese Journal of Applied Chemistry, 2022, 39(02): 289-297.

Figures/Tables 10

Table 1 Proximate and ultimate analysis of pine sawdust

序号	?	项目	质量分数
No.	?	Item	w／%
1	工业分析Industry analysis	Mar（收到基水分Moisture on as received basis）	10.88
?	?	Ad（干燥基灰分Ash on dry basis）	0.68
?	?	Vd（干燥基挥发分Volatile matter on dry basis）	86.46
?	?	FCd（干燥基固定碳Fixed carbon on dry basis）	12.86
2	元素分析Elemental analysis ^a	C	46.33
?	?	H	7.88
?	?	N	0.56
?	?	S	0.05
?	?	O ^b	45.18

Fig.1 Pyrolysis experimental device

Fig.2 TG（A）and DTG（B）curves of pine sawdust before and after pickling

Fig.3 TG（A）and DTG（B）curves of KCl loaded sample

Fig.4 TG（A）and DTG（B）curves of NaCl loaded sample

Fig.5 TG（A）and DTG（B）curves of CaCl loaded sample

Fig.6 TG（A）and DTG（B）curves of MgCl loaded sample

Fig.7 Distribution of pyrolysis products（A）and gas composition（B）of different samples at 500℃

Fig.8 Infrared spectra of pine sawdust（A）and tar（B）

Fig.9 GC／MS analysis of pyrolysis bio oil from different samples

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Effects of Alkali/Alkaline Earth Metals on Fast Pyrolysis of Pine Sawdust

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