Hybrid Membranes Prepared by the Sol-Gel Process and based on Silica- Polyvinyl Acetate for Methane Enrichment from BiogasQuechulpa-Pérez P1*, Pérez-Robles JF1, Pérez-de Brito AF2, Avilés-Arellano LM1
1Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Querétaro, Libramiento Norponiente No.2000. Frac. Real de Juriquilla Querétaro, Qro. C.P. 76230, Tel: +52 (442) 2 11 99 00
- *Corresponding Author:
- Quechulpa-Pérez P
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional
Unidad Querétaro. Libramiento Norponiente No. 2000
Frac. Real de Juriquilla, Querétaro, Qro. México
Tel: +52 (442) 2 11 99 00
E-mail: [email protected]
Received date : January 17, 2014; Accepted date : February 18, 2014; Published date : February 28, 2014
Citation: Quechulpa-Pérez P, Pérez-Robles JF, Pérez-de Brito AF, Avilés-Arellano LM (2014) Hybrid Membranes Prepared by the Sol-Gel Process and based on Silica-Polyvinyl Acetate for Methane Enrichment from Biogas. J Membra Sci Technol 4:128. doi:10.4172/2155-9589.1000128
Copyright: © 2014 Pompeyo QP, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The use of alternative energies to substitute or for using in a less degree the fossil fuels is one of the most important goals of our modern society. Currently research focuses on the production and use of bio-fuels, such as Biogas. However the produced biogas (composed mainly of methane, CH4) has different undesirable gases such as nitrogen, N2; carbon dioxide, CO2 and sulfur compounds, then it is very important to reduce these gases and to increase the concentration of methane gas. Regarding to that our research group is working in some type of hybrid membranes to increase the quality of methane gas in biogas and decrease the concentration of other gases. The gas separation was accomplished using hybrid membranes prepared by the sol-gel process, based on silica (SiO2) and polyvinyl acetate, PVAc. The material for the membranes was prepared using different concentrations of SiO2 (%w/w), and four different solvents (methanol, ethanol, propanol, butanol in different molar ratios) to make compatible the water, necessary for the process, and the tetraethylorthosilicate, TEOS; that is, the precursor of silica. We found that membranes porosity changed depending on the solvent used for the hybrid material preparation. The best membranes were obtained using methanol as solvent. On the other hand, when other solvents were used, the obtained membranes were of bad quality, showing abundant microcracks, visible to the eye, and for this reason they were rejected. For the gas separation tests, pure gases at low pressures similar to that found in bio-digesters conditions were used to test the hybrid membranes. Results showed that diffusion gases order is: H2, CH4, N2 and CO2. That was corroborated using a mixture of gases, as it is shown.