The impregnation of oil on solid surfaces is a major challenge currently due to the need to purify environments affected by disasters and accidents related to the oil and gas industry. In this work, microemulsion systems without oil phase were formulated containing nonionic surfactants of different degrees of ethoxylation (10, 8 and 6 ethoxylation bonds) for the solid-liquid extraction of heavy oil impregnated in sandstone rocks. A central composite design was carried out showing the total oil extraction efficiency (%EE) entre 3.680 ± 0.933 e 99.800 ± 0.266. Micellar comparison analyses showed the importance of alcohol in the process, since 20% more oil was removed in the presence of alcohol, and the use of oil-free microemulsions proved to be feasible in cross-current and counter-current processes, especially the system containing lauryl alcohol with six ethoxylation bonds (LA 6EO) that reached satisfactory oil extraction results on both processes (%EE ≥ 90%).

由于需要净化受与石油和天然气工业有关的灾难和事故影响的环境，因此将油浸在固体表面上是目前的主要挑战。在这项工作中，配制了不含油相的微乳液体系，其中包含不同乙氧基化程度的非离子表面活性剂（10、8和6个乙氧基化键），用于固-液萃取浸渍在砂岩中的重油。进行了中央复合设计，显示总采油效率（％EE）入口为3.680±0.933 e 99.800±0.266。胶束比较分析表明了酒精在该过程中的重要性，因为在存在酒精的情况下可以去除20％以上的油，并且证明无油微乳状液在横流和逆流过程中都是可行的，