Extração do cromo a partir de resíduos do processo de fabricação do couro e sua viabilização

Abstract

This study aims to analyze, reproduce and optimize a chromium extraction method for solid residues from the leather manufacturing process to obtain routes for product separation in the collagenic organic phase and inorganic phase with chromium ions. Furthermore, it aims at assessing the feasibility of obtaining such products with optimal operational parameters of the studied reaction. The analyzed procedures refer to the extraction by organic solvent and the opening of the sample by combinations of solutions of sulfuric acid, phosphoric acid, and sodium hydroxide. After that, a series of optimizations were applied to the methodology studied, leveraging chemometrics and functional optimization, to obtain indications of the optimal extraction. The experimental procedure of the reaction optimization required the complete project of a temperature PID controller, leveraging the embedded prototyping platform Arduino, that achieved success for the load and setpoint control procedures in the studied temperature interval. Besides a posterior quantitative analysis by light absorbance in the UV-VIS spectrum, leveraging the optimization procedure known as factorial planning, which resulted in indications of the effects and interactions that take the system towards the optimum reaction yield, depicting the studied methodology as a viable alternative to the extraction.