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Gas separation properties of crosslinked and non-crosslinked carboxymethylcellulose (CMC) membranes
, Article Scientia Iranica ; Volume 20, Issue 6 , 2013 , Pages 1921-1928 ; 10263098 (ISSN) ; Shafiabadi, N ; Mousavi, S. A ; Amini-Fazl, M. S ; Sharif University of Technology
Sharif University of Technology
2013
Abstract
In this study, crosslinked and non-crosslinked carboxymethylcellulose (CMC) membranes were prepared with different concentrations of polymer. Then, the permeability of pure CO2 , N2 , and CH4 was measured through these membranes in dry state to investigate the influence of polymer concentration and applied feed pressure on permeability and permselectivity. The permeability of CO2 through membranes was higher than the other gases. A comparison of permeabilities revealed that the permeability of N2 , CO2 , and CH4 increased on an average of 33, 40 and 20 percent, respectivly, by increasing the feed pressure from 6 to 10...
Fabrication or preparation and characterization of new modified MCM-41/PSf nanocomposite membrane coated by PDMS
, Article Separation and Purification Technology ; Volume 80, Issue 3 , August , 2011 , Pages 556-565 ; 13835866 (ISSN) ; Pakizeh, M ; Shafiee, A. R ; Mansoori, S. A. A ; Sharif University of Technology
2011
Abstract
MCM-41 nanoparticles were prepared by in situ assembly of inorganic precursors and CTAB. The structure of nanoparticles was characterized by XRD, TEM, particle size analysis, N2 adsorption techniques. The surface modification of particles in order to perfect dispersion in polysulfone (PSf) matrix was performed by dimethyldichlorosilane (DMDCS) and aminopropyltrimethoxysilane (APTMS) as new modification agents. Thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC) and SEM analysis were applied to investigate thermal stability, glass transition temperature and quality of distribution of particle in the nanocomposite membrane, respectively. The PDMS was used to coat the...
Polymeric mixed matrix membranes containing zeolites as a filler for gas separation applications: A review
, Article Journal of Industrial and Engineering Chemistry ; Volume 19, Issue 2 , 2013 , Pages 375-393 ; 1226086X (ISSN) ; Esmaeili, N ; Asadollahi, M ; Sharif University of Technology
2013
Abstract
Polymeric membrane technology has received extensive attention in the field of gas separation, recently. However, the tradeoff between permeability and selectivity is one of the biggest problems faced by pure polymer membranes, which greatly limits their further application in the chemical and petrochemical industries. To enhance gas separation performances, recent works have focused on improving polymeric membranes selectivity and permeability by fabricating mixed matrix membranes (MMMs). Inorganic zeolite materials distributed in the organic polymer matrix enhance the separation performance of the membranes well beyond the intrinsic properties of the polymer matrix. This concept combines...