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51315-6067-Method for Simulating the Effect of Pressure in Transfer Lines on the Corrosivity of HACs

Picture for Method for Simulating the Effect of Pressure in Transfer Lines on the Corrosivity of HACs
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Product Number: 51315-6067-SG
ISBN: 6067 2015 CP
Author: Carlos Mejia Miranda
Publication Date: 2015
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Method for simulating the effect of pressure in transfer lines on the corrosivity of "high acid crudes".The decrease of world reserves of conventional crude has led the oil industry to increase the percentage of so-called "opportunity crudes" in diets entering the distillation units. Among opportunity crudes are the "high acidity crude" that cause corrosion problems mainly in the transfer lines in the temperature range 220-400 ° C. The heterogeneity in the chemical nature of naphthenic acids present in crude hinders the development of accurate predictive tools. Work has been done to evaluate the effect of temperature and hydrodynamic conditions on the corrosivity of naphthenic acids. However the effect of pressure on the corrosivity of naphthenic acids considering these compounds as a mixture has not been studied. In this work the effect of the pressure of the transfer line on the distribution of the molecules of naphthenic acids in the vapor and liquid phases of an oil was evaluated. For this purpose homologous series of naphthenic acids were introduced in ASPEN HYSYS as hypothetical compounds. To each crude oil from the distillation curves and the acidity of the cuts the distribution profile of the naphthenic acids were determined. From this information the mole fractions of hypothetical compounds was calculated to simulate the transfer line. With the proposed methodology can be determined the reduction or increase of acidity in the liquid phase with the variation of pressure and / or temperature. The results were validated with a commercial mixture of naphthenic acids dissolved in mineral oil in the temperature range 200-350 C and pressure range of 20-100 psi.
Method for simulating the effect of pressure in transfer lines on the corrosivity of "high acid crudes".The decrease of world reserves of conventional crude has led the oil industry to increase the percentage of so-called "opportunity crudes" in diets entering the distillation units. Among opportunity crudes are the "high acidity crude" that cause corrosion problems mainly in the transfer lines in the temperature range 220-400 ° C. The heterogeneity in the chemical nature of naphthenic acids present in crude hinders the development of accurate predictive tools. Work has been done to evaluate the effect of temperature and hydrodynamic conditions on the corrosivity of naphthenic acids. However the effect of pressure on the corrosivity of naphthenic acids considering these compounds as a mixture has not been studied. In this work the effect of the pressure of the transfer line on the distribution of the molecules of naphthenic acids in the vapor and liquid phases of an oil was evaluated. For this purpose homologous series of naphthenic acids were introduced in ASPEN HYSYS as hypothetical compounds. To each crude oil from the distillation curves and the acidity of the cuts the distribution profile of the naphthenic acids were determined. From this information the mole fractions of hypothetical compounds was calculated to simulate the transfer line. With the proposed methodology can be determined the reduction or increase of acidity in the liquid phase with the variation of pressure and / or temperature. The results were validated with a commercial mixture of naphthenic acids dissolved in mineral oil in the temperature range 200-350 C and pressure range of 20-100 psi.
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