麦秸液化条件优化及液化产物理化性质研究

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2025-05-06 DOI:10.1016/j.biombioe.2025.107951

Zhan Ding , Linyu An , Min Yang , Hangbo Liu , Chenxi Tian , Fengkai Liu , Peilong Li

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引用次数: 0

摘要

农作物秸秆作为农业副产品是一种重要的生物质资源。通过有效的秸秆处理策略，提高秸秆的利用价值，是解决当前环境污染和能源短缺等挑战的关键。本研究采用有机液化溶剂，以98%浓硫酸为催化剂对秸秆进行液化。利用Box-Behnken响应面法评价了固液比、催化剂用量、液化时间和温度对液化收率的单独影响和交互影响。对数学模型进行综合分析，并在相同液化条件下，将秸秆分馏成纤维素和木质素等主要组分进行对比分析；结果表明：秸秆的液化速率主要取决于纤维素的液化速率，其液化反应较为复杂，反应动力学水平为1.71；采用傅里叶红外光谱（FTIR）、凝胶渗透色谱（GPC）、热重分析（TG）和旋转粘度（RV）测试对液化产物的理化性质进行了分析。结果表明，最佳液化条件为料液比1:4，催化剂用量2.5%，温度140℃，液化时间90 min，液化产物具有非牛顿流体性质。液化过程包括水解、降解和缩合反应，在不同阶段产生不同的产物。秸秆液化产物的热稳定性优于木质素，略低于纤维素。液化产物中含有丰富的羰基化合物、酚类化合物和羟基、羰基、芳环等官能团。它们的分子量分布系数在1.3 ~ 1.5之间，具有进一步工业加工的潜力。

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Optimization of wheat straw liquefaction conditions and phy-chemical characterization of liquefied products

Crop straw represents a significant biomass resource as an agricultural byproduct. It is essential to enhance the utilization value of crop straw through effective treatment strategies in addressing contemporary challenges such as environmental pollution and energy scarcity. This investigation employs organic liquefying solvents the liquefaction of straw using 98 % concentrated sulfuric acid as a catalyst. The Box-Behnken response surface methodology was utilized to evaluate the individual and interactive effects of the solid-liquid ratio, catalyst dosage, liquefaction time, and temperature on liquefaction yield. A comprehensive analysis of the mathematical model was conducted, and the straw was fractionated into its main components such as cellulose and lignin for comparative analysis under identical liquefaction conditions; The results showed that the liquefaction rate of straw mainly depended on the liquefaction rate of cellulose, and its liquefaction reaction was complex, with a reaction kinetic level of 1.71. The physicochemical properties of the liquefaction products were analyzed using Fourier Transform Infrared Spectroscopy (FTIR), Gel Permeation Chromatography (GPC), Thermogravimetric Analysis (TG), and Rotational Viscosity (RV) tests. The optimal liquefaction conditions were identified as a solid-liquid ratio of 1:4, a catalyst dosage of 2.5 %, a temperature of 140 °C, and a duration of 90 min, the obtained liquefaction products have non-Newtonian fluid properties. The liquefaction process, involving hydrolysis, degradation, and condensation reactions, produces distinct products at various stages. The thermal stability of the straw liquefaction products was superior to that of lignin but slightly inferior to cellulose. The liquefaction products were rich in carbonyl compounds, phenolic compounds, and functional groups such as hydroxyl, carbonyl, and aromatic rings. The molecular weight distribution coefficients of them were from 1.3 to 1.5, which indicates a good potential for further industrial processing.

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.