超声波-微波对杉木锯屑液化的强化效应研究

doi:10.3969/j.issn.0253-2417.2022.01.012

Abstract

Abstract:

The intensification effect of ultrasonic-microwave (UW-MW) assisted on the liquefaction of fir sawdust was discussed by using n-octanol as a solvent and sulfuric acid as a catalyst.The influence of process parameters on the liquefaction ratio was investigated, and the liquefied products were characterized and analyzed.The experimental results showed that ultrasonic-microwave had a good effect on the mass and heat transfer enhancement effect.Compared with the traditional liquefaction, the reaction time of sawdust ultrasonic-microwave assisted liquefaction was shortened from 60 min to 20 min, and the liquefaction ratio increased by 5.24%.Under the conditions of the mass ratio of solvent to sawdust of 6, the concentration of catalyst of 0.6 mol/L, the liquefaction rate of sawdust reached 64.30%, and the proper addition of γ-valerolactone could increased the liquefaction rate to 81.17%.In the liquefaction process, a little molten materials gradually deposited on the surface of the solid-residue product (SR), which hindered the further liquefaction of the fir sawdust.The most of degradation products of cellulose and hemicelluloses in the sawdust were mainly small-molecule sugars etc.which were enriched in the water-soluble product (WS).The degradation products of lignin were mainly composed of aromatic etc.substances which were distributed in the bio-oil product (BO).

Key words: fir sawdust, liquefaction, ultrasonic, microwave, intensification

CLC Number:

TQ35

Yu ZHAO, Jingwei YAN, Yiyuan YANG, Keying LI, Hengji ZHU, Zexiang LU. Intensification Effect of Ultrasonic-microwave on Liquefaction of Fir Sawdust[J]. Chemistry and Industry of Forest Products, 2022, 42(1): 87-94.

Figures/Tables 6

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Table 1

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Table 2

References 24

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液固比 liquid to solid ratio	液化率liquefaction rate/%
液固比 liquid to solid ratio	传统 traditional	MW	UW-MW
2∶1	37.32	39.47	42.98
6∶1	61.10	63.96	64.30

序号 No.	保留时间/s retention time	名称 name	相对峰面积relative peak area/%
序号 No.	保留时间/s retention time	名称 name	正辛醇 n-octanol	γ-戊内酯/正辛醇 γ-valerolactone/n-octanol
1	263.688	4-羟基-2-戊酮4-hydroxy-2-pentanone	0.158	0.384
2	286.284	3-甲醛3-furaldehyde		0.027
3	295.776	2-戊酮2-pentanone	15.151	10.494
4	296.28	2-己醇2-hexanol	0.005
5	383.808	丙酸丁酯butyl propionate	0.231	0.162
6	417.492	2-己酮2-hexanone		0.048
7	458.064	1，3-二氧戊环-4-甲醇1，3-dioxolane-4-methanol		0.017
8	484.104	2-丙酮2-propanone	0.077
9	489.144	2(3H)-呋喃酮2(3H)-furanone	11.745	14.586
10	698.808	正辛醇1-octanol	64.037	61.956
11	804.144	甲酸辛酯formic acid，octyl ester	0.352	0.868
12	921.071	苯benzene	0.022
13	948.96	乙酸辛酯acetic acid，octyl ester		0.645
14	1360.35	γ-脱氢芳烃γ-dehydro-ar-himachalene	0.130
15	1363.84	3-甲基-2-丁烯酸乙辛酯3-methyl-2-butenoic acid，ethyl ester		0.358
16	1420.14	γ-脱氢芳烃γ-dehydro-ar-himachalene		0.012
17	1420.37	环丙烷cyclopropane	1.302
18	1421.46	2，4-二叔丁基苯酚2，4-di-tert-butylphenol		0.553
19	1635.32	环八硅氧烷cyclooctasiloxane	0.023
20	2403.92	丁酸辛酯octyl butyrate		5.696
21	2053.22	1, 2-苯二甲酸，2-甲基丙酯丁酯 1, 2-benzenedicarboxylic acid，butyl 2-methylpropyl ester	0.057
22	2520.44	十二烷酰胺dodecanamide	0.033
23	2584.36	苯酚phenol	1.412	1.796
合计total			94.735	97.602

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Intensification Effect of Ultrasonic-microwave on Liquefaction of Fir Sawdust

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