Abstract
In this work, we investigate the use of microemulsions in the solubilization of heavy crude oil fractions, which are responsible for the formation of deposits in petroleum processing operations. Initially, the construction of phase diagrams was addressed, with the intention of determining the area within which microemulsions are formed. Unitol L 90 was used as a non-ionic surfactant. Butan-1-ol and butan-2-ol were tested as co-surfactants. Four different systems were studied: Unitol L 90 + butan-1-ol + water + kerosene (system 1), Unitol L 90 + butan-1-ol + water + xylene (system 2), Unitol L 90 + butan-1-ol + water + 90% kerosene/10% xylene (system 3), and Unitol L 90 + butan-2-ol + water + xylene (system 4). Physical adsorption experiments were carried out with the static method, aiming to simulate natural reservoir conditions. Crude oil samples from the Fazenda Belem field (Rio Grande do Norte State, Brazil) were used and dissolved in xylene. Arenite samples from the Assu (Rio Grande do Norte State) an...
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