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Wei Zhang,Shulan Ji,Naixin Wang,Jiding Li 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
In this work, the solution and diffusion properties of n-heptane, thiophene, 2-methylthiophene, 2,5-dimethylthiophene, ethyl sulfide, butyl mercaptan in poly[bis(phenoxy)phosphazene] (PBPP) werestudied by inverse gas chromatography. The infinite dilute activity coefficients and diffusion coefficientswere determined. Effects of temperatures and solvent species on the activity coefficients and diffusioncoefficients were investigated. The results showed that higher temperature was beneficial for bothsolution and diffusion process. Compared with pervaporation desulfurization performance in ourprevious work, the order of infinite dilute diffusion coefficients was in agreement with that of partialflux, which indicated that diffusion decided the permeability within solution–diffusion model.
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Peiyong Qin,Binbing Han,Cuixian Chen,Jiding Li,Benhui Sun 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6
We studied the influence of the gelation conditions on the formation kinetics of the polyphthalazine ether sulfone ketone (PPESK) membrane via wet phase inversion process experimentally and theoretically. Membrane formation and its morphology were first observed with an online optical microscope - CCD camera system. The resulting membranes prepared under various gelation conditions were then characterized by the gelation parameter, optical microscope, and SEM. Lastly, the relationship between the final membrane structure/permeation properties and the gelation parameter was discussed extensively. The results showed that both the gelation rate and the membrane flux increased dramatically as the gelation temperature increased. Moreover, the membrane structures became loose, and the porosity of membrane increased. Different non-solvent could change the solubility parameter between the polymer and the non-solvent, and thus the gelation rate greatly. With the increasing number of carbons in non-solvent, the gelation rate became slow, and the membrane gradually changed from a finger structure into a sponge structure. Adding NMP into the non-solvent changed the difference in the chemical potential and the solubility parameter between the polymer solution and the non-solvent, which in turn changed the gelation rate of polymer solution greatly. With the increasing concentration of NMP in non-solvent, the gelation rate became very slow and sponge structures formed with the non-solvent system of 80% NMP. A novel conclusion could be made that we could control the flux and reject of membrane just by changing the mean diffusion coefficient of skin, D, and the diffusion coefficient of skin, D1, in the process of membrane formation.
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