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Nowadays microwave radiation is being researched to produce biodiesel from different raw materials due to the many advantages that this technology presents compared to traditional transesterification, such as shorter reaction times and less amount of heat energy to obtain biodiesel. The aim of this research was to explore the possibility of carrying out the microwave-assisted transesterification of macroalgae and compare the results with the traditional transesterification. For that reason, some experiences were conducted using sunflower oil and macroalgae as raw material. Based on the obtained results, the best conditions for microwave-assisted transesterification reaction were macroalgae to methanol ratio of 1:15 (wt/vol), sodium hydroxide concentration of 2 wt % and reaction time of 3 min.

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The refractive indices of lithium, magnesium, and copper sulfate in ethanol + water solutions were measured over the temperature range (288.15 to 318.15) K and at atmospheric pressure. Also, ethanol + water and single salt + water binary systems were measured. Binary and ternary systems were correlated using polynomial expressions, and the parameters depend on the composition of the mixtures. Data fitting shows good agreement with experimental values.