Continuous drying of a solid wetted with ternary mixtures
Continuous drying of a solid wetted with ternary mixtures
复制标题
用三元混合物润湿的固体的连续干燥
DOI：
10.1002/aic.690430314
复制
发表时间：
1997
期刊：
影响因子：
3.7
通讯作者：
Joaquín Martínez
中科院分区：
文献类型：
--
作者：
Marcia Vidaurre;Joaquín Martínez
从理论上研究了三元混合物润湿的固体与气流连续接触方式对干燥选择性的影响。使用乙醇-异丙醇-水和水-乙醇-丙酮的液体混合物。建立了描述气相控制过程的数学模型，并通过仿真研究了过程变量的影响。除了入口组成的水分和温度的固体，气体组成对选择性有最重要的影响。气体成分的微小变化，无论是强制的还是自发的，都可能完全改变过程轨迹。这些影响的程度取决于入口气体和固体中所含液体的流速之间的比率。由于它们对温度和组成的演变的影响，操作压力和除对流之外的能量来源也可用于控制选择性。由于所有这些变量都决定了剩余液体的组成，从而决定了产品质量，因此它们的影响应该是可预测的。该模型可能是一个有价值的工具，探索的过程中，干燥是气相控制。
The influence on drying selectivity of the continuous-contact mode between a solid wetted with ternary mixtures and a gas stream was theoretically studied. The liquid mixtures, ethanol–isopropanol–water and water–ethanol–acetone, were used. A mathematical model describing a gas-phase-controlled process was developed, and the influence of the process variables was studied by simulations. In addition to the inlet composition of the moisture and temperature of the solid, gas composition has the most important effect on selectivity. Small changes of gas composition, either imposed or spontaneous, may modify completely the process trajectory. The extent of these effects depends on the ratio between the flow rates of inlet gas and liquid contained in the solid. Because of their effects on the evolution of temperature and composition, the operating pressure and energy sources other than convection are also useful in controlling the selectivity. Since all these variables determine the composition of the remaining liquid and thereby product quality, their influence should be predictable. The model may be a valuable tool for exploring the process, provided that drying is gas-phase-controlled.