بررسي و مطالعه اثر حلال، كمپلكس حلال - اسيد و نانو ذرات آلومينا بر خواص جداسازي گاز غشاي پلي سولفون

چكيده انگليسي :

1 Investigating Effect of Solvent Acid Solvent Complex and Alumina Nanoparticles on the Gas Separation Properties of Polysulfone Membrane Samaneh Baghersad s baghersad@ce iut ac ir 2012 04 15 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Morteza Sadeghi m sadeghi@cc iut ac ir Abstract In This research a series of PSF membranes were prepared using Tetrahydroforan THF Dimethylformamide DMF N methylpyrrolidone NMP and Dimethylacetamide DMAC solvents via phase inversion method CO2 CH4 N2 and O2 gases were used to evaluate the gas separation properties of prepared membranes Results of gas permeation are as followed PSF NMP PSF DMAC PSF THF PSF DMF Amoung these prepared membranes PSF DMF membrane has most CO2 CH4 CO2 N2 and O2 N2 ideal selectivities with amount of 37 9 13 34 and 5 5 respectively In the next part of the study the effect of propionic acid on gas separation properties of polysulfone membrane was investigated To evaluate the effect of PA 9 different solutions containing PA were prepared for membrane casting Then the results were comprised to Robeson upper bound to select the optimum membrane PSF membrane with 25 wt polysulfone and 35 wt propionic acid showed the best performance The results showed that permeability and selectivity increase by increasing the amount of propionic acid in polysulfone membranes Furthermore when concentration of polymer in membrane structure was decreased permeability of membrane was creased due to more molecular entanglements and restricted pathway and when concentration of polymer in membrane structure was decreased permeability of membrane was increased because of non selective defects At the end of the research the effect of Alumina nanoparticles on the gas separation properties of the PSF membrane was evaluated Polysulfone and polysulfone alumina nanocomposite membranes were prepared by thermal phase inversion method The performances of prepared membrane in gas separation were measured at pressure of 10 barg and temperature of 35 C Membranes were prepared with alumina content of 5 10 15 20 and 30 wt The prepared nanocomposite membranes were characterized using ATR SEM and XRD methods The SEM results demonstrated good distribution of alumina particles in the polymer matrix This confirms the desirable mixing of the alumina in polymer and also a good compatibility between two phases Also the SEM results were showed the size of particles were nano scale and were not accumulated From XRD patterns of nanocomposites membranes excluded that crystalinity of prepared samples decreased with nanoparticles The FT IR patterns show the absorption peak at 830 1635 cm 1 respect to bonded hydroxyl for Alumina that height of these picks was increased with nanoparticles The gas separation results showed that permeability and selectivity of gases increase by increasing the amount of alumina in PSF Alumina membranes Permeability of CO2 O2 N2 and CH4 was increased from 10 9 6 38 1 07 and 0 37 barrer in pure polysulfone to 15 31 8 77 1 38 and 0 46 barrer in the nanocomposite containing 30 wt of the alumina nanoparticles respectively Furthermore the selectivity of CO2 CH4 CO2 N2 and O2 N2in the corresponding membranes demonstrated an increase from 29 46 10 19 5 96 in pure PSF to 33 28 11 09 and 6 35 in the composite membranes The CO2 N2 and CO2 CH4 selectivity were increase more than that of O2 N2 by alumina content resulting mainly from the superior solubility selectivity of polar CO2 gas while the solubility of O2 N2 remains nearly constant Keywords membrane polysulfone alumina nanocomposite gas permeation

باقرصاد، سمانه

بررسي و مطالعه اثر حلال، كمپلكس حلال - اسيد و نانو ذرات آلومينا بر خواص جداسازي گاز غشاي پلي سولفون

غشاي نانو كامپوزيت , پروبيوتيك اسيد