Structural insights of asphaltenes through mild oxidation reactions and MID infrared spectroscopy

FERNANDO ANDRES ROJAS RUIZ; Diego Rolando Merchan Arenas; Santiago Villabona Estupiñan; Juan Sebastian Ramírez Pradilla; Jorge Armando Orrego Ruiz

doi:10.29047/01225383.656

FERNANDO ANDRES ROJAS RUIZ Ecopetrol S.A. Instituto Colombiano del petróleo y energías de la Transición ICPET. Piedecuesta Santander Colombia https://orcid.org/0000-0002-3566-9498
Diego Rolando Merchan Arenas Ecopetrol S.A. Instituto Colombiano del petróleo y energías de la Transición ICPET. Piedecuesta Santander Colombia https://orcid.org/0000-0001-9243-5914
Santiago Villabona Estupiñan Desarrollo en tecnologías de Hidrocarburos SAS, Piedecuesta, Santander, Colombia https://orcid.org/0000-0003-2431-1906
Juan Sebastian Ramírez Pradilla ECOPETROL, Instituto Colombiano del Petróleo y energías de la transición ICPET, Piedecuesta, Santander Colombia https://orcid.org/0000-0001-7937-2322
Jorge Armando Orrego Ruiz Ecopetrol S.A. Instituto Colombiano del petróleo y energías de la Transición ICPET. Piedecuesta Santander Colombia https://orcid.org/0000-0002-9087-1074

DOI: https://doi.org/10.29047/01225383.656

Palabras clave: Caracterización de asfaltenos, reacciones de oxidación sobre asfaltenos, relación espectro composición

Resumen Referencias bibliográficas Cómo citar Descargas

Resumen

Cuatro asfaltenos fueron sometidos a reacciones de oxidación suaves. Los productos de oxidación se caracterizaron mediante espectroscopía infrarroja para proponer descriptores estructurales, aprovechando la alta sensibilidad para detectar vibraciones de carbono y oxígeno en el espectro infrarrojo. Aunque el trabajo no se enfocó en cuantificar grupos funcionales, se logró una buena comparación entre la materia prima y los productos, después de de-convolucionar los espectros FTIR. Se confirmó que los grupos metilo son fragmentos útiles para rastrear la posición de las topologías alquílicas sobre las estructuras de asfaltenos durante las reacciones de oxidación, ya que la oxidación es más adecuada en α-H de las cadenas de alquilo laterales. Considerando lo anterior, se pudo inferir que los ésteres fueron los principales grupos funcionales formados bajo las condiciones de oxidación empleadas. La formación de lactonas sobre núcleos aromáticos se monitoreó a través de la pendiente de un diagrama de paridad entre las intensidades de las bandas alrededor de 1730 cm^-1 y 1230 cm^-1. Los análisis TGA-MS y
de RMN-H1 ofrecieron ofreció información valiosa que contribuyó a confirmar los atributos estructurales de las muestras obtenidos por FTIR. Los resultados obtenidos en esta investigación demuestran que el manejo de la selectividad de oxidación sobre mezclas de hidrocarburos tan complejas podría tener una relevancia más amplia que se extiende más allá del uso de procesos de oxidación para la mejora de asfáltenos, hacia propósitos de caracterización
estructural.

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Cómo citar

ROJAS RUIZ, F. A., Merchan Arenas, D. R., Villabona Estupiñan, S., Ramírez Pradilla, J. S., & Orrego Ruiz, J. A. (2024). Conocimientos estructurales de asfáltenos mediante reacciones de oxidación leves y espectroscopia de infrarrojo medio. CT&F - Ciencia, Tecnología Y Futuro, 14(2), 29–44. https://doi.org/10.29047/01225383.656