ساخت غشا زمينه مركب بر پايه پلي سولفون و نانوذرات گرافن متخلخل براي جداسازي اتيلن از اتان و پروپيلين از پروپان

چكيده انگليسي :

80 Mixed matrix membranes based polysulfone and graphene particles for separation of ethylene ethane and propylene propane Mohaddeseh Najafi Arani Mohaddeseh najafi@ce iut ac ir Date of Submission 2016 01 17 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 Ethylene and propylene are the most important feedstock in the petrochemical industry Large quantitiesof these light olefins are used in the production of plastics and chemicals Ethylene and Propylene areproduced by different methods such as steam cracking catalytic cracking and dehydrogenation of paraffins Separation of olefin paraffins mixture is great significance in petrochemical industry and currently performedby cryogenic distillation which is expensive and energy intensive duo to the low relative volatilities of thecomponents Polymeric membrane separations have been considered as an attractive alternative because oflow energy consumption low capital investment and simple operation In the last decades improving theperformance of polymeric membranes for example by adding inorganic nanofillers is one of the predominantconcerns of the researchers In the present work the separation of ethylene ethane and propylene propane bypolysulfone nanoporous graphene nanocomposite membranes were studied the nanoporous grapheneprepared via a one pot hydrothermal treatment added to polysulfone to achieve a nanocomposite membranefor the separation of ethylene ethane and propylene propane The prepared membranes were characterizedusing FT IR SEM and XRD methods The results demonstrate a nano scale distribution of nanoporousgrapheme particles in the polymer matrix The performance of prepared membranes in ethylene ethane andpropylene propane separation were measured at pressure of 2 bar and temperature of 30 C The obtainedresults showed that the permeability of ethylene and propylene increased from 013 barrer and 0 092 barrer inpure polysulfone to 0 38 barrer and 0 22 barrer in the composite membrane containing 1 wt nanoporousgraphene particles The comparison of the selectivities C3H6 C3H8 indicates an increase in these quantitiesfrom 3 45 in pure polymer to 4 08 in composite membrane containing 1 wt nanoporous graphene particles The diffusion and solubility coefficients were determined by the time lag method The results showed anincrease in solubility coefficient and diffusion coefficient of gases with increasing the 1 wt nanoporousgraphene For example the diffusion coefficient of ethylene increase from 71 1 10 10 cm2 s in purepolysulfone to 108 6 10 10 cm2 s in composite membrane containing 1 wt nanoporous graphene particlesand it s solubility coefficient increased from 1 84 10 3 cm3 STP cm3 cmHg to 3 5 10 3 cm3 STP cm3cmHg Keywords Olefin Paraffin separation polymeric nanocomposite membrane polysulfone nanoporous grapheme gas separation

نجفي آراني، محدثه

ساخت غشا زمينه مركب بر پايه پلي سولفون و نانوذرات گرافن متخلخل براي جداسازي اتيلن از اتان و پروپيلين از پروپان

جداسازي الفين / پارافين , غشاي زمينه مركب پليمري , گرافن اكسيد كاهش يافته متخلخل , جداسازي گاز