使用多频超声波技术干燥晶体纳米纤维素 (CNC) 与部分传统干燥技术的综合比较

IF 20.2 Q1 MATERIALS SCIENCE, PAPER & WOOD Journal of Bioresources and Bioproducts Pub Date : 2024-07-14 DOI:10.1016/j.jobab.2024.07.003
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引用次数: 0

摘要

纤维素纳米晶体(CNCs)因其可再生性、丰富的原料来源和良好的机械性能而受到越来越多的关注。然而,其商业化生产的瓶颈之一是干燥过程。由于分离后悬浮液中的氯化萘浓度较低,因此氯化萘干燥需要去除大量水分,以获得干燥产品供后续利用并节省运输成本。为提高产品质量、降低能耗和提高生产率,我们开发了一种新型的多频、多模、调制超声波干燥技术用于 CNC 干燥。通过傅立叶变换红外光谱(FT-IR)分析、X 射线衍射(XRD)分析、热重分析(TGA)、差示扫描量热法(DSC)和再分散性,对采用不同干燥技术干燥的 CNC 进行了表征,以测量其质量和性能变化。在相同的温度和气流速率下,超声波干燥提高了干燥速率,与热空气干燥相比,干燥时间至少缩短了 50%。超声波干燥的氯化萘平均粒度随沉降时间的变化很小,表明其再分散性良好。此外,超声波干燥的氯化萘在水溶液中表现出良好的稳定性,zeta 电位在 -35 至 -65 mV 之间。对各种 CNC 干燥技术的具体能耗和二氧化碳排放量进行了评估。与其他干燥技术相比,超声波干燥的能耗明显降低。此外,如果使用可再生电力,全电气化超声波干燥的潜在二氧化碳排放量可能为零。
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Comprehensive comparison of cellulose nanocrystal (CNC) drying using multi-frequency ultrasonic technology with selected conventional drying technologies
Cellulose nanocrystals (CNCs) have garnered increased attention due to their renewable nature, abundant feedstock availbility, and good mechanical properties. However, one of the bottlenecks for its commercial production is the drying process. Because of the low CNC concentrations in suspension after isolation, CNC drying requires the removal of a large amount of water to obtain dry products for the following utilization and saving shipping costs. A novel multi-frequency, multimode, modulated ultrasonic drying technology was developed for CNC drying to improve product quality, reduce energy consumption, and increase production rate. CNCs dried with different drying technologies were characterized by Fourier transform infrared (FT-IR) spectra analysis, X-ray diffraction (XRD) analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and redispersibility to measure the quality and property changes. Under the same temperature and airflow rate, ultrasonic drying enhanced drying rates, resulting in at least a 50% reduction in drying time compared to hot air drying. The mean particle sizes of CNC from ultrasonic drying changed little with settling time, indicating good redispersibility. In addition, ultrasonic dried CNCs exhibited good stability in aqueous solutions, with the zeta potentials ranging from –35 to –65 mV. Specific energy consumption and CO2 emissions of various CNC drying technologies were evaluated. Energy consumption of ultrasonic drying is significantly reduced compared to other drying technologies. Moreover, the potential CO2 emissions of the fully electrified ultrasonic drying could be net zero if renewable electricity is used.
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来源期刊
Journal of Bioresources and Bioproducts
Journal of Bioresources and Bioproducts Agricultural and Biological Sciences-Forestry
CiteScore
39.30
自引率
0.00%
发文量
38
审稿时长
12 weeks
期刊最新文献
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