杨木水热预处理过程中水解反应动力学研究

doi:10.3969/j.issn.0253-2417.2022.01.003

Abstract

Abstract:

The effects of pretreatment temperature and time on the content of the hydrolysate of poplar during thermal hydrolysis were investigated. The reaction kinetic models of xylose and glucose in the hydrolysis solution were established by using the modified Saeman biphasic kinetic model. The reaction rate constants of monosaccharides generation and degradation under different conditions were determined by nonlinear fitting curve. The activation energy of lignocellulosic hydrolysis reaction was obtained by linear fitting of Arrhenius formula. The results showed that xylan was divided into an easy-to-hydrolyse fraction and a difficult-to-hydrolyse fraction during the pretreatment of poplar. The activation energies of easy-to-hydrolyse(E_f) and difficult-to-hydrolyse(E_s) xylan were 78.35 kJ/mol and 88.97 kJ/mol, respectively. The activation energy of xylose degradation(E₂) was 80.17 kJ/mol. Furthermore, the activation energy of glucan degradation(E₃=48.06 kJ/mol) was significantly lower than that of glucose degradation(E₄=90.18 kJ/mol). These results indicated that glucose was more stable than xylose, and the mild treatment conditions of hydrothermal pretreatment could realize the dissolution of hemicellulose accompanied by reducing the degradation of cellulose and monosaccharide.

Key words: poplar, hydrothermal pretreatment, biphasic kinetic model

CLC Number:

TQ35
TS713

Yan WU, Zhongjian TIAN, Jiachuan CHEN, Fengshan ZHANG, Guigan FANG, Xingxiang JI. Hydrolysis Kinetics of Poplar During Thermal Hydrolysis[J]. Chemistry and Industry of Forest Products, 2022, 42(1): 21-28.

Figures/Tables 8

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Table 4

References 25

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T/K	k_f/min^-1	k_s/min^-1	k′₂ /min^-1	α	R²
423.15	0.0016	-0.0018	-0.0306	0.45	0.98
433.15	0.0032	0.0012	0.0065	0.62	0.97
443.15	0.0052	0.0018	0.0129	0.75	0.98
453.15	0.0082	0.0035	0.0218	0.82	0.96
463.15	0.0110	0.0057	0.0268	0.89	0.98

项目item	拟合方程fitting equation	R²	E/(kJ·mol^-1)	A/min^-1
易降解木聚糖easily degradable xylan	y=9424.01x+15.94	0.98	78.35	8.37×10⁶
难降解木聚糖hardly degradable xylan	y=10700.75x+17.83	0.99	88.97	5.54×10⁷
木糖分解xylose degradation	y=9642.84x+17.32	0.94	80.17	3.33×10⁷

T/K	k₃ /min^-1	k₂/min^-1	β	R²
423.15	0.00247	-0.00550	0.032	0.95
433.15	0.00411	0.00782	0.063	0.99
443.15	0.00624	0.01962	0.094	0.98
453.15	0.00715	0.03058	0.140	0.97
463.15	0.00810	0.03263	0.160	0.95

项目item	拟合方程fitting equation	R²	E/(kJ·mol^-1)	A/min^-1
葡聚糖降解glucan degradation	y=-5780.72x+7.78	0.92	48.06	2.39×10³
葡萄糖分解glucose degradation	y=-10845.99x+20.33	0.93	90.18	6.75×10⁸

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Hydrolysis Kinetics of Poplar During Thermal Hydrolysis

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