Desarrollo de membranas para la separación de olefinas utilizando redes metal orgánicas (mofs)

Abstract

Due to the importance of the search for new methods in the industry, with low cost, less aggressive to the environment and easy to implement, the possibility of separation of olefins, in particular, propylene (C3H6) and propane (C3H8) a Through Metal Organic Networks (MOFs). MOF membrane technologies have become an active area in recent years, mainly because of the flexibility in design, as well as their thermal and chemical stability. In addition to being materials that can meet critical parameters such as selectivity without compromising permeation, unlike polymer or inorganic membranes. Therefore, it was proposed to construct a solid absorbent material such as Zeolitic Imidazolate Networks (ZIFs) and Organic Metal Networks (MOFs) supported on a solid material (α-alumina) for the Separation of propane-propylene, so that they can serve as a package within an adsorption column. The first part of the document presents generally the demand for propylene, the processes commonly employed in the separation of olefins-paraffins, a description of the MOFs and because they can be considered as an option, the methods for the preparation of membranes ending with a review of the state of the art of these materials in gas separation. The second part is composed of the experimental part for the synthesis of membranes by the in situ growth method for the membranes of ZIFs (ZIF-7 and ZIF- DESARROLLO DE MEMBRANAS PARA LA SEPARACIÓN DE OLEFINAS UTILIZANDO REDES METAL ORGANICAS (MOFs) xiii 8), while for the MOF membrane (HKUST-1) Was performed by secondary growth, complementing this section with the characterization techniques used as: scanning electron microscopy, powder X-ray diffraction, infrared spectrophotometry, thermogravimetric analysis as well as permeation tests to evaluate the performance of the membranes. Finally, the results of the synthesized membranes are presented, where a higher selectivity coefficient is presented for the ZIF-8 membrane ie it has a higher affinity for propane, whereas the HKUST-1 membrane reverses the affinity for propylene. Therefore, it is considered that this study has an important contribution to the recovery of olefins.