In-situ characterization of the reaction progress of the fluid catalytic cracking reactions by laser diagnostic techniques

Sophisticated analytical techniques, such as mass spectrometry and high-performance liquid chromatography (HPLC), can be used to measure aromatic and saturate contents of the Fluid Catalytic Cracking (FCC) feedstock and products. However, optical methods have the advantage of being rapid and non-intrusive, operating in contact-less mode. Laser-absorption measurements of fuel concentration are often made at mid-infrared (MIR) wavelengths near 3.4 µm, which overlap with the strong C-H stretch vibrational transitions of hydrocarbons and guarantee sensitive detection even for short measurement path lengths. The MIR spectra for individual hydrocarbons can be found in different databases, however the information is limited to being used with species having low carbon number. In this sense, a Group Contribution Method (GCM) is proposed for the spectra prediction of the different compounds present in the catalytic cracking reaction in the region 3200-2800 cm-1. This PhD thesis considers the development of a laser diagnostic methodology for “in-situ-free of particles” monitoring of fluid catalytic cracking (FCC) reaction progress using model compounds. The aim is to contribute to the characterization of the chemistry and chemical species involved in FCC through the discrete evaluation of the infrared (IR) spectra. The methodology proposed considers the in-situ MIR analysis of the change in the concentration of functional groups present in the model compound 1,3,5-triisopropylbenzene (1,3,5-TIPB) as indicator of FCC reaction progress. This is performed in the annulus of a CREC Riser Simulator. As well, the considered approach postulates the application of this in-situ MIR methodology for the characterization of the light gases and gasoline lumps in the context of Industrial FCC unit using a sampling bottle with two cameras under vacuum. This research was carried out at the Grupo de Investigación Bioprocesos y Flujos Reactivos at Universidad Nacional de Colombia. An internship in the group of Professor Hugo de Lasa (Western University - Ontario Canada) allowed the development of a Group Contribution Method (GCM) for the characterization of the reaction progress of a model FCC reaction.

• Autores: López Zamora, Sandra Milena
• Tipo de recurso: Doctoral thesis
• Fecha de publicación: 2019
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/69234
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/69234; http://bdigital.unal.edu.co/70827/
• Palabra clave: 62 Ingeniería y operaciones afines / Engineering; 66 Ingeniería química y Tecnologías relacionadas/ Chemical engineering; Fluid Catalytic Cracking (FCC); Group Contribution Method (GCM); Mid-IR (MIR); C-H Bond; Reaction Progress; Craqueo Catalítico Fluidizado; Método de contribución de grupos; Enlace C-H; Progreso de Reaccion
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional