Abstract
Membrane technology effectively separates CO 2 from CH 4 and has been practiced for many years but requires membranes with high selectivity and permeability. Different approaches are employed to improve membrane performance and it is soon possible to develop a blended polymeric membrane that separates high pressure gas streams at the point of processing pressure. However, glassy polymers suffer a lack of permeability causing their performance to drop as an upper bound trade-off but highly selective and rubbery polymers have high permeability with low selectivity. As an amine solution is capable of purifying naturally acidic gas, blending glassy, rubbery polymers with amines-specifically, polysulfone and polyvinyl acetate with diethanol amine in dimethyl acetamide as solvent-we developed flat sheet membranes with desirable properties. As it is now possible to acquire amine-polymer blends with more desirable properties by mixing with a miscible polymer, it is essential to observe factors that affect the polymer's miscibility with amines. Hence, we also analyzed the effects of blend ratios on different properties. Blended membranes of different ratios were synthesized and their functional groups were characterized by Fourier Transformed Infra-Red spectroscopy (FTIR). We then employed Thermal Gravimetric Analysis (TGA) to describe weight loss and Field Emission Scanning Electron Microscopy (FESEM) to determine respective morphologies.
Highlights
Various CO2 capture technologies exist for the removal of CO2 from natural gas
Membrane technology is a valued method for the separation of CO2 from CH4 and has been in use for many years. It holds numerous advantages over other techniques that are more appropriate for gas separation in certain sectors (Wee et al, 2008; Wind et al, 2004; Baker, 2004; Ismail and David, 2001; Sanders, 1988). For this reason and since membranes with high selectivity and high permeability are increasingly desired, procedural enhancements of polymeric membranes have been explored that include the development of mixed matrix membranes (Hussain, 2006; Vu et al, 2003; Moore, 2004; Chung et al, 2007); polymer blend membranes (Acharya et al, 2008; Semsarzadeh and Ghalei, 2012; Hosseini et al, 2008; Khan et al, 2011) that include a carbon dioxide solvent such as ionic liquids within the polymer matrix to increase carbon dioxide solubility (Bara et al, 2007; Oral et al, 2011; Tang et al, 2005)
The blending of polysulfone and polyvinyl acetate with Diethanol amine (Fig. 2) was done using Dimethylacetamide (DMAc) as solvent (Fig. 3) at a ratio of 20% wt/wt with 80% without amine and 20% polymer equaling total weight
Summary
Various CO2 capture technologies exist for the removal of CO2 from natural gas. These include physical absorption (Littel et al, 1990; Chiesa and Consonni, 1999); chemical absorption (Bishnoi and Rochelle, 2002; Aroonwilas and Veawab, 2004; Rochelle, 2009); adsorption (Harlick and Tezel, 2004; Cheng and Tan, 2009); and membrane (Powell and Qiao, 2006). Membrane technology is a valued method for the separation of CO2 from CH4 and has been in use for many years It holds numerous advantages over other techniques that are more appropriate for gas separation in certain sectors (Wee et al, 2008; Wind et al, 2004; Baker, 2004; Ismail and David, 2001; Sanders, 1988). They have low selectivity but high permeability; of such is polyvinyl acetate
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Research Journal of Applied Sciences, Engineering and Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
