Effect of tetrasodium EDTA on the vapor-liquid equilibria of ethanol-water system

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Document Type

Article

Source Title

PIChE Journal

Volume

12

Issue

1

First Page

67

Last Page

73

Publication Date

2-2010

Abstract

In this study, the potential of tetrasodium ethylenediaminetetraacetic acid (EDTA) as entrainer in salt distillation was determined by the establishment of a vapor-liquid equilibrium (VLE) data. The presence of this known chelating agent was used in the generation of the VLE data with concentration ranging from 0.05 molal to 0.20 molal concentrations with respect to the mass of solvents present in solution using the VLE apparatus modified by Novianti (2007). The composition of the equilibrium phases was determined using gas chromatography and simulation was done using MATLAB® and extended UNIQUAC and UNIFAC-Dortmund model for the activity coefficient of the liquid phase. The VLE data was found to yield higher ethanol fractions in the vapor phase compared to the system without the chelating agent. However, temperature of the resulting mixture was found to be higher due to the prevalence of ion-dipole interactions. Data using 0.10 molal salt and higher resulted to higher vapor fractions of ethanol at concentrations of the salt with higher degree of saturation. The salt was able to shift the azeotropic point of the mixture to a maximum ethanol concentration of 99.39% by volume (99.22% by mass). The experimental data was best represented by the extended UNIQUAC model while unsatisfactory using the UNIFAC (Dortmund) model due to the inability of the system to interact as system with interacting functional groups

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Disciplines

Chemical Engineering

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