Implementación y validación del método de ensayo para la cuantificación de aceite en ceras de refinería por cromatografía de gases (GC)

Abstract

The purpose of this study is to implement and validate the gas chromatography (GC) testing method as an alternative to the traditional method for quantifying oil in refinery waxes, seeking to optimize analysis times, reduce sample handling, and improve analyst safety. Problem: The ASTM D721 gravimetric method used in the laboratory is a slow and operationally demanding procedure, involving high sample handling, exposure to hazardous solvents, and critical operating conditions, which negatively impacts laboratory productivity and contributes to variability in results. Objective: To implement and validate a gas chromatography method for the quantification of oil in refinery waxes, applied to real matrices and under laboratory operating conditions. Method: A GC test method was developed and implemented, establishing the chromatographic conditions and evaluating analytical parameters such as repeatability, precision, and comparison with the ASTM D721 reference method, in order to ensure the reliability of the results obtained. Results: The implemented method was applied to production waxes from the Barrancabermeja Refinery Management (GRB), showing consistent results, good agreement with the gravimetric method, and a significant improvement in operational ease and analysis efficiency. As a result of the study, the method was presented to the refinery's General Management, accompanied by technical instructions and knowledge transfer through training of the paraffin station personnel.