جداسازي اتيلن از اتان و پروپيلن از پروپان بوسيله غشاي نانو كامپوزيت پلي ايميد- نانو سيليكا

چكيده انگليسي :

Separation of ethylene ethane and propylene propane by polyimide Silica Nanocomposite Membranes Seyyed Mohammadreza Davoodi sm davoody@ce iut ac ir Date of submission 2014 01 20 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiAbstractEthylene and propylene are two of the most important petrochemicals which their main sourcesare steam cracking and FCC processes Currently separation of olefin and paraffin gases iscarried out using low temperature distillation process which is very expensive and energyconsuming Due to the high costs and complexity of cryogenic distillation using polymericmembrane separation processes is gradually growing in popularity for olefin paraffin separationpurposes It has been found that polymeric membranes e g polysulfone cellulose acetate andPDMS are not suitable for this kind of separation because of their very small separation factors On the other hand much better olefin paraffin separation characteristics were achieved by usingpolyimides as membrane materials Undesirably one problem identified with polyimide films forpropylene propane separations was plasticization effect In this research the separation ofethylene ethane and propylene propane by polyimide silica nano composite membranes wasstudied To this aim sol gel method was used for preparation of polyimide nano composite Polyimide and polyimide silica nano composite membranes were prepared by thermal phaseinversion method The prepared membranes were characterized using FT IR SEM and XRDanalyses The obtained SEM micrographs and FT IR spectras confirmed that the silicananoparticles were homogenously distributed in polymer matrix The performance of theprepared membranes in ethylene ethane and propylene propane separation was evaluated atpressure and temperature of 3bar and 310K respectively The obtained results showed increasingin permeability of propylene and ethylene from 0 091 and 0 266 barrer respectively in purepolyimide to 0 159 and 0 411 barrer in the composite membrane containing 20 wt nanosilicaparticles Increase in propylene and ethylene permeability is due to the enhanced solubility inpolymer matrix The obtained results indicated that selectivity values of 3 24 and 9 forC2H4 C2H6 and C3H6 C3H8 separation respectively by pure polyimide was increased to 6 13and 17 9 for composite membrane containing 20 wt nanosilica particles To investigate theeffect of adding silica nanoparticles on plasticization phenomena gas permeation of PI and PI silica nanocomposite membranes was studied for propylene and propane single gases at pressurerange of 1 8 bar and for ethylene and ethane single gases at pressures of 1 3 and 5bar Plasticization was observed for propylene and propane in pure PI at the feed pressure of 4 and 6bar respectively These results indicated that in PI nanocomposite membranes with silica

داودي، محمدرضا

جداسازي اتيلن از اتان و پروپيلن از پروپان بوسيله غشاي نانو كامپوزيت پلي ايميد- نانو سيليكا

جداسازي اولفين/پارافين , جداسازي گازها