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Acid removal from crude oils by catalytic esterification naphthenic acid catalize by Mg/Al hydrotalcite

By Nicolás Alejandro Redondo, María Laura Dieuzeide and Norma Elvira Amadeo

Abstract

The presence of relatively high levels of naphthenic acids in crude oil may cause serious corrosion problem at temperature between 200 °C and 400 °C. One of the viable processes for decreasing acidity is the esterification of the present acids using an alcohol such as methanol. Therefore, the aim of this work is to develop a solid catalyst for the esterification reaction of 3-cyclopentylpropionic acid representative of the naphthenic acids.The esterification reaction is carried out at 80 °C, 3.5 kg/cm2 of pressure in a mechanically stirred batch reactor, using Mg-Al hydrotalcite (Mg/Al = 4) with different activation treatments as catalyst. These solids are characterized by N2 sorptometry and X ray diffraction. The higher concentration of Bronsted basic sites present in uncalcined hydrotalcite would explain the satisfactory performance obtained. TAN decreased 90% by operating at a temperature as low as 80 °C after 60 min of reaction. The catalytic activity is evaluated at different reaction conditions such as, mass of catalyst, stirring speed and reaction temperature. A kinetic study for heterogeneous esterification of 3-cyclopentylpropionic acid with methanol was performed.Fil: Redondo, Nicolás Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Tecnologías del Hidrogeno y Energias Sostenibles. Universidad de Buenos Aires. Facultad de Ingeniería. Instituto de Tecnologías del Hidrogeno y Energias Sostenibles; ArgentinaFil: Dieuzeide, María Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Tecnologías del Hidrogeno y Energias Sostenibles. Universidad de Buenos Aires. Facultad de Ingeniería. Instituto de Tecnologías del Hidrogeno y Energias Sostenibles; ArgentinaFil: Amadeo, Norma Elvira. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Tecnologías del Hidrogeno y Energias Sostenibles. Universidad de Buenos Aires. Facultad de Ingeniería. Instituto de Tecnologías del Hidrogeno y Energias Sostenibles; Argentin

Topics: 3 PROPIONIC CYCLOPENTIL, CRUDE OILS, HETEROGENEOUS ESTERIFICATION, MG/AL HYDROTALCITE, NAPHTHENIC ACID, Ingeniería de Procesos Químicos, Ingeniería Química, INGENIERÍAS Y TECNOLOGÍAS
Publisher: 'Elsevier BV'
Year: 2019
DOI identifier: 10.1016/j.cattod.2019.09.051
OAI identifier: oai:ri.conicet.gov.ar:11336/113399
Provided by: CONICET Digital
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