PreFEED corporation solution for R&D to Design

Tips to Scale-up & Design

Physical Properties

On the B Value of the Antoine Equation (0811)
Vapor pressure is the most important of the physical properties used in process design. Although latent heats of vaporization were often estimated using vapor pressure data before, recently, it seems that less attention has been paid to this due the spread of simulators. Here, we have summarized the relationships between the B value of the Antoine equation, latent heat of vaporization, and the boiling point. (Y. Kumagae)
Effect of Pressure and Third Component on Azeotropic Composition (1001)
One of the factors that complicate handling distillation separation processes is the azeotropic phenomenon. A system which forms an azeotropic mixture cannot be separated into pure components by ordinary distillation. Therefore, various measures such as chemical absorption, the addition of a third component, pressure changes, reactive distillation and the like have been devised since long ago to deal with this issue. Here, we will discuss the effect of pressure and of adding a third component on the azeotropic composition. (H. Taguchi)
Guidelines for Ternary Azeotropic Points (1007)
Although there are many actual measurement data on binary azeotropic mixtures, there are currently few data for ternary systems and prediction is difficult. It is time-consuming and inefficient to check all regions even when conducting experiments.
Here, we will introduce a rule of the thumb which seems to be effective for the purpose of estimating ternary azeotropic points. (H. Taguchi)
Determination of Vapor-Liquid Equilibrium Parameters Using Azeotropic Data (1109)
The vapor-liquid equilibrium calculations using activity coefficient models such as the Wilson and NRTL models are widely practiced and have a number of successful applications. Binary parameters are required in order to use activity coefficient models, and they are generally determined from actually measured vapor-liquid equilibrium data. On the other hand, even when vapor-liquid equilibrium data is not measured, it is possible to estimate vapor-liquid equilibrium with relatively high accuracy when azeotropic data can be used. Here we will consider a method for estimating the binary parameters of an activity coefficient model using azeotropic data, and examine the accuracy of this method. (H. Taguchi)
Estimation of Vapor-Liquid Equilibrium from Liquid-Liquid Equilibrium Data (1202)
First, we introduced a vapor-liquid equilibrium estimation method from azeotropic data as an estimation method of vapor-liquid equilibrium in the absence of measured values (Tips #1109). Here, we will introduce a vapor-liquid equilibrium estimation method when liquid-liquid equilibrium data can be used. The liquid-liquid equilibrium data is usually in a lower temperature region than the vapor-liquid equilibrium. (Y. Kumagae)
Determination of Antoine Equation Parameters (1212)
Physical property data is extremely important for performing process design and plant data analysis. Physical properties include equilibrium physical properties (pure substance vapor pressure, vapor-liquid equilibrium, specific heat, heat of evaporation, etc.) and transport properties (viscosity, thermal conductivity, diffusion coefficients). Among these, the pure substance vapor pressure is significantly important as it is the basis for estimating other physical property values. We will introduce a parameter determination method for the Antoine equation which is often used for pure substance vapor pressure calculations. (Y. Kumagae)

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