Molecular Modelling of Diesel Hydrotreating Processes

Several studies regarding molecular modelling of refining processes have been carried out during last decades, which demonstrate the importance of molecular management in the optimisation of petroleum operations. One of the most studied processes has been hydrotreating, not only because of the techn...

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Autor Principal: Freire Ord??ez, Diego Mauricio
Otros Autores: Zhang, Nan
Formato: Tesis de Maestría
Lenguaje:eng
Publicado: Manchester / Universidad de Manchester 2017
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Acceso en línea:http://repositorio.educacionsuperior.gob.ec/handle/28000/4290
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spelling oai:localhost:28000-42902017-06-20T08:02:43Z Molecular Modelling of Diesel Hydrotreating Processes Freire Ord??ez, Diego Mauricio Zhang, Nan MODELADO MOLECULAR HIDROTRATAMIENTO OPTIMIZACI?N DI?SEL Several studies regarding molecular modelling of refining processes have been carried out during last decades, which demonstrate the importance of molecular management in the optimisation of petroleum operations. One of the most studied processes has been hydrotreating, not only because of the technical, safety and operating importance of removing olefins, heavy metals, sulphur, nitrogen and oxygen compounds from petroleum fractions but also due to the stricter environmental control that demands the removal of harmful compounds, such as aromatics. Hence, it is essential to have a better understanding of the chemistry involved in hydrodesulphurisation and to include it as part of the process modelling to get a better perspective of the overall process. One of the main issues of building reliable molecular models of petroleum refining processes has been the difficulty of validating these models with appropriate information regarding the true composition of the different components of crude oil. Therefore, the improvement and development of analytical methods for hydrocarbon research during last years is regarded as a valuable breakthrough, for making possible a deeper analysis of the composition of complex mixtures and for enabling a greater availability of this essential information. With this background, it was proposed the molecular modelling and optimisation of diesel hydrotreating processes, based on the available information of the reactor model, the actual composition of different reactor feeds and products, their distillation curves and densities. Moreover, for the representation of the molecular composition of the feedstocks and products, Molecular Type and Homologous Series (MTHS) matrices were built and utilised through the entire modelling process. Furthermore, the molecular composition of the different components (organised by carbon number) of each homologous series were considered to follow statistical distributions, which were fitted by probability density functions (PDFs). Finally, by the employment of the proposed models, it was achieved a precise estimation of other bulk properties of feedstocks and products of the diesel hydrotreating processes, such as molecular weight, cetane number, kinematic viscosity, flash point, aniline point, cloud point and pour point. In a nutshell, the building of reliable and integrated models of the entire hydrotreating process, containing a strong chemical background, is expected to allow a better selection and application of optimisation strategies to improve the economic, operating and environmental performance of refineries. Additionally, the developed methodology could be extended for being applied in the modelling and optimising of other refining processes. 2017-06-19T21:04:23Z 2017-06-19T21:04:23Z 2016-11 masterThesis Freire Ord??ez, Diego Mauricio. (2016). Molecular Modelling of Diesel Hydrotreating Processes. (Trabajo de titulaci?n de la Maestr?a en Dise?o e Integraci?n avanzados de Procesos). Universidad de Manchester. Manchester. 177 p. http://repositorio.educacionsuperior.gob.ec/handle/28000/4290 eng openAccess http://creativecommons.org/licenses/by-nc-sa/3.0/ec/ 177 p. Manchester / Universidad de Manchester
institution SENESCYT
collection Repositorio SENESCYT
biblioteca Biblioteca Senescyt
language eng
format Tesis de Maestría
topic MODELADO MOLECULAR
HIDROTRATAMIENTO
OPTIMIZACI?N
DI?SEL
spellingShingle MODELADO MOLECULAR
HIDROTRATAMIENTO
OPTIMIZACI?N
DI?SEL
Freire Ord??ez, Diego Mauricio
Molecular Modelling of Diesel Hydrotreating Processes
description Several studies regarding molecular modelling of refining processes have been carried out during last decades, which demonstrate the importance of molecular management in the optimisation of petroleum operations. One of the most studied processes has been hydrotreating, not only because of the technical, safety and operating importance of removing olefins, heavy metals, sulphur, nitrogen and oxygen compounds from petroleum fractions but also due to the stricter environmental control that demands the removal of harmful compounds, such as aromatics. Hence, it is essential to have a better understanding of the chemistry involved in hydrodesulphurisation and to include it as part of the process modelling to get a better perspective of the overall process. One of the main issues of building reliable molecular models of petroleum refining processes has been the difficulty of validating these models with appropriate information regarding the true composition of the different components of crude oil. Therefore, the improvement and development of analytical methods for hydrocarbon research during last years is regarded as a valuable breakthrough, for making possible a deeper analysis of the composition of complex mixtures and for enabling a greater availability of this essential information. With this background, it was proposed the molecular modelling and optimisation of diesel hydrotreating processes, based on the available information of the reactor model, the actual composition of different reactor feeds and products, their distillation curves and densities. Moreover, for the representation of the molecular composition of the feedstocks and products, Molecular Type and Homologous Series (MTHS) matrices were built and utilised through the entire modelling process. Furthermore, the molecular composition of the different components (organised by carbon number) of each homologous series were considered to follow statistical distributions, which were fitted by probability density functions (PDFs). Finally, by the employment of the proposed models, it was achieved a precise estimation of other bulk properties of feedstocks and products of the diesel hydrotreating processes, such as molecular weight, cetane number, kinematic viscosity, flash point, aniline point, cloud point and pour point. In a nutshell, the building of reliable and integrated models of the entire hydrotreating process, containing a strong chemical background, is expected to allow a better selection and application of optimisation strategies to improve the economic, operating and environmental performance of refineries. Additionally, the developed methodology could be extended for being applied in the modelling and optimising of other refining processes.
author2 Zhang, Nan
author_facet Zhang, Nan
Freire Ord??ez, Diego Mauricio
author Freire Ord??ez, Diego Mauricio
author_sort Freire Ord??ez, Diego Mauricio
title Molecular Modelling of Diesel Hydrotreating Processes
title_short Molecular Modelling of Diesel Hydrotreating Processes
title_full Molecular Modelling of Diesel Hydrotreating Processes
title_fullStr Molecular Modelling of Diesel Hydrotreating Processes
title_full_unstemmed Molecular Modelling of Diesel Hydrotreating Processes
title_sort molecular modelling of diesel hydrotreating processes
publisher Manchester / Universidad de Manchester
publishDate 2017
url http://repositorio.educacionsuperior.gob.ec/handle/28000/4290
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score 11,871979