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首页> 外文期刊>Journal of Microencapsulation: Microcapsules Liposomes Nanoparticles Microcells Microspheres >Fluidized bed microencapsulation:Thermodynamics of aqueous and ethanolic coating processes
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Fluidized bed microencapsulation:Thermodynamics of aqueous and ethanolic coating processes

机译：流化床微囊化：水性和乙醇涂层工艺的热力学

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摘要

This paper aims to provide the fluidized bed scientist with appropriate and simple tools for the elaboration of efficient experimental designs of microencapsulation processes by fluidized bed using any combination of solvent and gas.Psychometric charts are used to predict and optimize experimental parameters in microencapsulation by fluidized bed evaporative cooling processes.This paper shows that theoretical psychrometric charts for water-air,ethanol-air and,by extrapolation,and solvent-gas mixtures can be developed from simple thermodynamic equations.The psychometric charts are constructed from readily available or calculable physical data such as the heat capacities of the gas and the solvent,the latent heat of vapourization of the solvent and the saturation concentration of the solvent in the fluidization gas.The calculated psychometric chart for water-air mixtures presented in this paper is shown to agree very well with the generally accepted charts found in the literature.An ethanol-air psychometric chart is built using the same equations and compared to experimental data of evaporative cooling processes using ethanol as the solvent.The paper shows a very good agreement between the calculated psychometric charts and the empirical data obtained from both ethanol-based and water-based evaporative cooling experiments.The results show the soundness and the relevance of the theoretical development behind the construction of the calculated psychometric charts;the accuracy of any other solvent-gas psychometric charts built using the equations proposed in this paper can be rightly extrapolated.
机译：本文旨在为流化床科学家提供适当而简单的工具，以阐明使用溶剂和气体任意组合的流化床微囊化工艺的有效实验设计。使用心理学计量表预测和优化流化床微囊化的实验参数本文表明，可以从简单的热力学方程式中得出水-空气，乙醇-空气以及通过外推法和溶剂-气体混合物的理论干湿图。这些干湿图是根据容易获得或可计算的物理数据构建的作为气体和溶剂的热容量，溶剂的汽化潜热和流化气体中溶剂的饱和浓度。本文显示的水-空气混合物的计算心理图非常吻合以及文献中公认的图表。用相同的方程式建立了诺尔-空气心理测量图，并与以乙醇为溶剂的蒸发冷却过程的实验数据进行了比较。本文表明，所计算的心理测量图与从乙醇基和水获得的经验数据之间有很好的一致性结果显示了计算出的心理图的构建背后的理论发展的稳健性和相关性;可以正确推断使用本文提出的方程式构建的任何其他溶剂-气体心理图的准确性。

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