On crystallization procedure of sodium dihydrogen phosphate within H2O-ethylene glycol binary system

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL

Particuology Pub Date : 2025-04-05 DOI:10.1016/j.partic.2025.03.017

Yayuan Zheng, Hao Lv, Xinka He, You Zhou, Cheng Gou, Huaiming Du, Ping Zhu

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引用次数: 0

Abstract

The application of sodium dihydrogen phosphate (NaH₂PO₄) in drinking water and food processing underscores the importance of its crystallization process, which significantly affects product quality and yield. In this study, the dynamic laser method was used to explore the solubility and super-solubility of NaH₂PO₄ in H₂O-ethylene glycol (EG) binary systems of different proportions. We first applied the Apelblat, Van't Hoff, and NIBS-RK models to correlate solubility data and identified the best-fitting model. Then, the Mersmann and Barata models were used to determine the solid-liquid surface tension and crystal surface entropy factor. The Van't Hoff model calculated the molar enthalpy, entropy of dissolution, and Gibbs free energy. Experimental results showed that dissolution is endothermic and spontaneous, mainly driven by enthalpy changes, while crystallization is exothermic, providing key data for kinetics research. In the kinetics analysis, NaH₂PO₄ crystallization was found to be linearly correlated growth, with the logarithm of crystal particle number density positively related to particle size. Comparing the CR and ASL models, the ASL model better reflects the growth rate. The derived nucleation and growth kinetics models indicated that growth and nucleation rates are positively correlated with temperature and supersaturation ratio. During cooling crystallization, the supersaturation ratio has a greater impact on the growth rate than the nucleation rate and a more significant effect on nucleation than suspension density and stirring rate. This research offers valuable guidance for high-quality NaH₂PO₄ industrial production.

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磷酸二氢钠在水-乙二醇二元体系中的结晶过程

磷酸二氢钠（NaH2PO4）在饮用水和食品加工中的应用凸显了其结晶过程的重要性，结晶过程对产品质量和收率有重要影响。本研究采用动态激光方法研究了NaH2PO4在不同比例的h2o -乙二醇（EG）二元体系中的溶解度和超溶解度。我们首先应用Apelblat、Van't Hoff和NIBS-RK模型来关联溶解度数据，并确定了最佳拟合模型。然后，利用Mersmann和Barata模型确定了固液表面张力和晶体表面熵因子。范霍夫模型计算了摩尔焓、溶解熵和吉布斯自由能。实验结果表明，溶解是吸热自发的，主要由焓变驱动，而结晶是放热的，为动力学研究提供了关键数据。在动力学分析中，发现NaH2PO4的结晶与生长呈线性相关，晶体颗粒数密度的对数与粒径呈正相关。对比CR模型和ASL模型，ASL模型更能反映增长率。导出的成核和生长动力学模型表明，生长和成核速率与温度和过饱和比呈正相关。在冷却结晶过程中，过饱和比对生长速率的影响大于成核速率，对成核的影响大于悬浮密度和搅拌速率。本研究对高质量的NaH2PO4工业生产具有指导意义。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.