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Title: Potential for functionalised ionic liquids in olefin/paraffin separation using composite polymer membranes, extraction or reactive distillation
Author: Deng , Rui
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2013
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In this work, non-membrane and membrane methods were utilized to investigate the separations of olefin/paraffin and several industrial gas pairs. The non-membrane methods section investigated different methods used for olefin and paraffin separations which include liquid extraction and reactive distillation. I -hexene and n-hexane were selected as the olefin and paraffin representatives and were tested in all the liqu id extraction and distillation separation experiments. In the liquid extraction separation systems, three different extractants were used namely [Bmim][N Tf2L silver nitrate salt of MIM-PS (1-( 1-methyl-3-im idazolio)propane-3 -su lfonate) dissolved in [Bmim][HS041 mixtures and [BmimHBF,l cont aining AgBF4• Distribution coefficients of I -hexene and n-hexane were ca lculated for each and selectivities were also obtained from the distribution coefficient data. For the distillation separation method, silica supported ionic liquids (SILs) of [Bmim][NTf21 and [Bmim][BF41 containing AgBF4 were prepared and adopted as the reactive packing to aid in the separation of the olefin. Vapour-liquid equilibrium (VlE) data were studied for the ordinary distillation without Sils packing as well as for the different reactive distillation systems. TPU (Thermal polyurethane) and PSF (polysulfone) were selected as the polymer materials to carry out the olefin/paraffin permeabilities and separation effects tests in the membrane sepa ration section. Casting and coating composite polymer/ionic liquid membranes of different weight ratios of polymer to ionic liquid were made to undertake the olefin/paraffin separation tests. Ethane/ethylene and propane/propylene gas pairs were selected as the olefin/ paraffin rep resentatives. Co mposite TPU/AgOTf/[Bmim+OTfj and TPU/AgPFt;/ [Bmim+PF6-1 membranes were also pre pa red and tested for olef in/paraffin separations. Diffe rent weight ratios of polymer to silver salt and mol ratios of silver salt to ionic liquid were chosen to synthesize the composite polymer/silver salt/ionic li quid membranes. Finally, the olefin/ paraffin separation mechanisms were discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available