Wet torrefaction of biomass waste into value-added liquid product (5-HMF) and high quality solid fuel (hydrochar) in a nitrogen atmosphere

In this research, we conducted a comprehensive investigation into the influence of reaction conditions on the WT process, evaluating its effects on the surface morphology and elemental composition of the resulting hydrochar, as well as on the formation of value-added liquid products, such as 5-hydroxymethylfurfural (5-HMF). During the course of our study, we utilized wood cellulose pulp residue (WCPR) as the feedstock and subjected it to WT in a nitrogen atmosphere. This process encompassed a temperature range of 180–260 °C, H2O/WCPR ratios ranging from 10 to 25, and reaction durations spanning from 15 to 60 min. Our findings unequivocally revealed that the reaction conditions during the WT of WCPR significantly influence the properties of the resulting hydrochar and the distribution of liquid products. Elemental and proximate analyses showed that as the reaction temperature and time increased during the WT of WCPR, the hydrochar composition experienced significant changes, including an increase in carbon content and a reduction in oxygen content.

本研究针对湿式焙烧（Wet Torrefaction, WT）过程的反应条件影响开展了系统性探究，评估了该工艺对所得水热炭（hydrochar）表面形貌与元素组成的作用，同时考察了其对高附加值液态产物（如5-羟甲基糠醛（5-hydroxymethylfurfural, 5-HMF））生成的影响。研究过程中，我们以木质纤维素纸浆残渣（wood cellulose pulp residue, WCPR）为原料，在氮气氛围下对其实施WT处理。该工艺的实验参数覆盖：反应温度区间180~260 ℃、水与WCPR的配比范围10~25，以及反应时长15~60 min。研究结果明确证实，WCPR的WT反应条件对所得水热炭的性能及液态产物的分布具有显著影响。元素分析与工业分析结果显示，随着WT过程中反应温度与时长的升高，水热炭的组成发生显著变化，具体体现为碳含量提升、氧含量降低。