Pyrolysis Mechanism of Flax Fiber Under Different Heating Rates

doi:10.7503/cjcu20230131

Abstract

Abstract:

In order to study the pyrolytic mechanism of flax fiber at high temperature， the thermal kinetic analysis of pure flax fiber pyrolysis was firstly conducted under non-isothermal conditions in this paper. Initially， the pyrolytic properties of flax fiber were explored by thermogravimetric experiments at four heating rates. Then， the distribution of activation energy with conversion was calculated through six model-free methods， and the reaction model categories corresponding to different reaction stages were determined by two model-fitting methods. After combining the kinetic compensation effect analysis， the reaction model function of flax fiber pyrolysis was optimized and reconstructed. After that， the accuracy of the function was evaluated by model independence analysis. Finally， the pyrolytic products of flax fiber were summarized through mass spectrometry. The results indicated that the main reaction stage of flax fiber could be regarded as one independent sub-reaction， whose temperature interval was located in the pyrolysis temperature range of hemicellulose， cellulose， lignin and other components. The reaction mechanism of the main reaction stage was closer to F-series model. The reconstructed function demonstrated high fitting degree and reasonable accuracy. The pyrolysis products of flax fiber mainly contained 11 kinds of organic compounds， including aldehydes and olefin， etc.

Key words: Flax fiber, Pyrolysis, Kinetics, Model reconstruction, Product category

CLC Number:

O643

TrendMD:

WANG Haochen, ZHAO Jun. Pyrolysis Mechanism of Flax Fiber Under Different Heating Rates[J]. Chem. J. Chinese Universities, 2023, 44(10): 20230131.

Figures/Tables 12

References 30

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Method	0.26<α<0.86
Method	Temperature range/℃	Range of E_a/（kJ·mol^-1）	Average value of E_a/（kJ·mol^-1）
FWO	298.88—407.79 298.88—407.79 298.88—407.79	251.65—302.27	280.81
KAS		253.97—304.66	284.32
FR		275.83—324.68	283.27
AIC	298.88—407.79 298.88—407.79 298.88—407.79	261.00—314.00	284.47
Starink		261.12—307.44	284.96
Tang		261.08—304.77	284.91

Method	0.26<α<0.86
Method	Temperature range/℃	Range of E_a/（kJ·mol^-1）	Average value of E_a/（kJ·mol^-1）
FWO	298.88—407.79 298.88—407.79 298.88—407.79	251.65—302.27	280.81
KAS		253.97—304.66	284.32
FR		275.83—324.68	283.27
AIC	298.88—407.79 298.88—407.79 298.88—407.79	261.00—314.00	284.47
Starink		261.12—307.44	284.96
Tang		261.08—304.77	284.91

β/（℃·min^-1）	a/min^-1	b/（kJ·mol^-1）	T_iso/℃	k_iso	R²
5	0.19808	-7.29165	607.2246	0.000681	0.998
10	0.18780	-5.51241	640.4635	0.004036	0.988
15	0.19297	-5.98749	623.3044	0.002510	0.998
20	0.19263	-5.91041	624.4045	0.002711	0.997

β/（℃·min^-1）	a/min^-1	b/（kJ·mol^-1）	T_iso/℃	k_iso	R²
5	0.19808	-7.29165	607.2246	0.000681	0.998
10	0.18780	-5.51241	640.4635	0.004036	0.988
15	0.19297	-5.98749	623.3044	0.002510	0.998
20	0.19263	-5.91041	624.4045	0.002711	0.997

β/（℃·min^-1）		f（α）=6α^0.56（1-α）^1.88
β/（℃·min^-1）	E_a/（kJ·mol^-1）	lnA	R²
5	272.19	52.92	0.993
10	293.22	58.52	0.994
15	299.75	59.66	0.993
20	271.70	54.03	0.993
Mean	284.22	56.28	0.993