Produção de sabão líquido a partir de óleo de fritura residual coletado em lanchonetes da Universidade Federal da Paraíba

Abstract

The improper disposal of residual frying oil represents a serious environmental problem due to its slow degradation and high polluting potential. In this context, this study aimed to produce liquid soap from the reuse of this residue, collected from cafeterias at the Federal University of Paraiba, with the purpose of obtaining a sustainable product of practical use for the institution itself. The oil was subjected to filtration and deodorization processes, followed by experimental formulations with different proportions of reagents and additives. The obtained product was characterized through physicochemical analyses, including pH, density, viscosity, turbidity, and foam index, as well as sensory evaluation of odor, color, and stability. The results indicated that the liquid soap presented a pH range between 8 and 10, consistent with the standards established by the Brazilian Health Regulatory Agency (ANVISA), and showed suitable characteristics for domestic use. It was also observed that variations in the amount of surfactants influenced foaming and viscosity, demonstrating the need for formulation adjustments to improve performance. Therefore, it is concluded that recycling frying oil into liquid soap is a technically feasible and environmentally sustainable alternative, contributing to reducing the environmental impacts of improper disposal while promoting circular economy practices within the academic environment.