Inglés

Ana Paula Silva,Ricardo A Malagoni,Moilton R Franco Jr,Noemy D De Carvalho

doi:10.18273/revion.v29n2-2016010

Inglés

Ana Paula Silva, Ricardo A Malagoni + Show 2 more

Open Access

https://doi.org/10.18273/revion.v29n2-2016010

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Journal: Revista ION	Publication Date: Dec 28, 2016
Citations: 1	License type: cc-by

Affiliation: Universidade Federal de Uberlândia

Abstract

AbstractThis paper deals with the solubility of urea in ethanol-water mixtures in mole fractions of ethanol between 0.0901 and 1.000 at temperatures ranging from 278.1 to 333.1K. The investigation of solubility contributes to research in many others fields of study in chemical engineering, since there are several studies where the solubility of urea and its behavior in solution influence the system. The experiment was carried out at constant temperature, stirring for 2 hours and then leaving the solution at rest for 2 hours. After collecting the data, the solubility of urea was calculated based on the gravimetric method. The experimental results obtained were correlated with the temperature of the solvents using three equations based on the literature. The three models demonstrated results in line with the experimental data. It was observed that adding ethanol to the water decreased urea solubility in all cases. The differences between the predicted and the experimental values were on average 4.7%.

Highlights

Urea (NH2-CO-NH2) is the most commonly used nitrogen fertilizer in the world, due to their low value and high nitrogen content [1,2]
According to the above-mentioned correlations of experimental data obtained at different temperatures in various mixtures of ethanol and water and in pure ethanol together with the calculated data (Tables 2−5), it was indicated that the solubility of urea calculated from the studied models showed good agreement
Taking the solubility data in the selected solvents fitted by the Yaws et al model as an illustration, the relative average deviations are 0.01%, 0.06%, 0.16%, and 0.62%, respectively; which indicate that the modified Yaws et al equation is suitable for correlating the solubility data of urea in the mixtures of ethanol and water and in pure ethanol

Summary

Introduction

Urea (NH2-CO-NH2) is the most commonly used nitrogen fertilizer in the world, due to their low value and high nitrogen content [1,2]. The solubility of urea in pure ethanol and in ethanol and water mixtures (0.0901; 0.2096 and 0.3757 of ethanol) at temperatures ranging from 278.2 to 333.2K was systematically measured by gravimetric method.

Results

Conclusion