Abstract
Produced water (PW) is one of the main sources of oil pollution and it represents the most important environmental concern associated to the oil industry. In this work, microemulsion systems were used to remove dispersed oil from PW. The systems used in the experiments were composed by PW as aqueous phase; kerosene as oil phase; isoamyl alcohol as co-surfactant; and Dissolvan® or Lipesa® as surfactant. An experimental design was applied for process optimization. Experiments were performed according to Scheffé net and showed oil removal efficiencies (%RE) between 24–99%. The microemulsion extraction point used for the process optimization was composed by 60 wt% PW, 5 wt% kerosene, and 35 wt% co-surfactant/surfactant ratio (C/S ratio = 9). The effects of C/S ratio, microemulsion load capacity, oil removal kinetics, temperature, and speed of phase separation were evaluated. From these tests, it was possible to achieve 100% oil removal using C/S = 9, t =25 min, T = 50–60 °C, demonstrating the feasibility of the systems evaluated.
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