Specialty polymeric membranes. 9. Separation of benzene/cyclohexane mixtures through poly(vinyl chloride)–graft–poly(butyl methacrylate)

Yoshikawa, Masakazu; Tsubouchi, Keisuke

doi:10.1016/s0376-7388(99)00037-x

Cited by 31 publications

(8 citation statements)

References 30 publications

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“…In PV separation experiments, the simultaneous enhancement of the flux and selectivity has been a challenging task. For improving or optimizing the flux and selectivity, several techniques have been attempted, such as polymer crosslinking,6–8 selective species grafting onto the polymer backbone,9, 10 copolymerization,11 hydrophilic polymer blending with a hydrophobic polymer,12, 13 and composite membranes 14. Among the many hydrophilic membranes, sodium alginate (NaAlg) membranes have been reported for the dehydration of aqueous–organic mixtures 15, 16.…”

Section: Introductionmentioning

confidence: 99%

Pervaporation separation of water and dioxane mixtures with sodium alginate‐g‐polyacrylamide copolymeric membranes

Kurkuri

Aminabhavi

2003

J of Applied Polymer Sci

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Polyacrylamide (pAAm)-grafted sodium alginate (NaAlg) copolymeric membranes have been prepared and used in the pervaporation separation of dioxane mixtures containing10 -70 mass % water. Three different polymeric membranes have been prepared: neat NaAlg, 46% grafted pAAm-g-NaAlg, and 93% grafted pAAm-g-NaAlg.For reduced brittleness and increased flexibility of the membranes, 10 mass % poly(ethylene glycol) and 5 mass % poly(vinyl alcohol) were added to all three membranes. With the transport data for the mixtures through the membranes, the permeation flux, selectivity, pervaporation separation index, swelling index, and diffusion coefficients have been calculated at 30°C. The Arrhenius activation parameters for the transport processes have been calculated for 10 mass % water in the feed mixture with flux and diffusion data obtained at 30, 40, and 50°C.

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Section: Introductionmentioning

confidence: 99%

Pervaporation separation of water and dioxane mixtures with sodium alginate‐g‐polyacrylamide copolymeric membranes

Kurkuri

Aminabhavi

2003

J of Applied Polymer Sci

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“…are mainly driven by the need to improve the process efficiency of conventional separation processes (e.g., extractive and azeotropic distillations) involving such mixtures. Numerous studies show that polymerbased [76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92] and zeolite-based membranes 18,50,94 provide economically attractive alternatives to the energy intensive conventional separation technologies. Factors that play an important role in the selection of the best performing membrane for a specific industrial separation requirement are flux or permeance, selectivity toward the desired product, feasibility of operation at industrially relevant conditions, membrane cost, reliability, robustness, ease of scale-up, and environmental and safety- ).…”

Section: Model Extrapolation To Conditions Of Interest In Industrial ...mentioning

confidence: 99%

Predicting Benzene Fluxes in NaX Membranes from Atomistic Simulations of Cooperative Diffusivities

2004

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In the preceding companion article, we reported high-temperature molecular dynamics (MD) simulations to trace single-molecule as well as collective mean square displacements over a range of temperatures (600−1500 K) and loadings (infinite dilution to four benzenes per supercage) to evaluate respectively the self-diffusivities and cooperative (alternatively Maxwell−Stefan) diffusivities of benzene in NaX (Si:Al = 1.2). In this follow-up article, we use the loading- and temperature-dependent Maxwell−Stefan diffusivities to predict single-component fluxes for benzene in NaX membranes at steady state as a function of typical experimental parameters such as temperature, benzene feed side and permeate side partial pressures. We explore whether support resistances need to be included in our transport model. We compare our model predictions with experimental permeation data and find that our MD-simulated diffusivities overestimate experimental fluxes by about 2 orders of magnitude when support resistance is ignored. On the other hand, when support resistances are included, our predictions come within 1 order of magnitude of experimental data. The remaining discrepancy, which is analogous to those between microscopic and macroscopic probes of diffusion in zeolites, may arise from defects within zeolite membranes.

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“…Of the innumerable binary mixtures whose separations were studied by pervaporation for a matter of purification of one of the components, in Bz/Cx, Bz is industrially converted to Cx by catalytic hydrogenation, and therefore, its purification by separation is thus required. The intensive research on the pervaporative separation of this system18–43 witnesses to its peculiarity, which lies mainly on the very close boiling points of the components, 80.103°C for Bz versus 80.738°C for Cx, and on the fact that it is an azeotropic mixture.…”

Section: Introductionmentioning

confidence: 99%

Interplay between grain structure and protein adsorption on functional response of osteoblasts: Ultrafine‐grained versus coarse‐grained substrates

Misra

Nune

Pesacreta

et al. 2012

J Biomedical Materials Res

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The rapid adsorption of proteins is the starting and primary biological response that occurs when a biomedical device is implanted in the physiological system. The biological response, however, depends on the surface characteristics of the device. Considering the significant interest in nano-/ultrafine surfaces and nanostructured coatings, we describe here, the interplay between grain structure and protein adsorption (bovine serum albumin: BSA) on osteoblasts functions by comparing nanograined/ultrafine-grained (NG/UFG) and coarse-grained (CG: grain size in the micrometer range) substrates by investigating cell-substrate interactions. The protein adsorption on NG/UFG surface was beneficial in favorably modulating biological functions including cell attachment, proliferation, and viability, whereas the effect was less pronounced on protein adsorbed CG surface. Additionally, immunofluorescence studies demonstrated stronger vinculin signals associated with actin stress fibers in the outer regions of the cells and cellular extensions on protein adsorbed NG/UFG surface. The functional response followed the sequence: NG/UFG(BSA) > NG/UFG > CG(BSA) > CG. The differences in the cellular response on bare and protein adsorbed NG/UFG and CG surfaces are attributed to cumulative contribution of grain structure and degree of hydrophilicity. The study underscores the potential advantages of protein adsorption on artificial biomedical devices to enhance the bioactivity and regulate biological functions.

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Specialty polymeric membranes. 9. Separation of benzene/cyclohexane mixtures through poly(vinyl chloride)–graft–poly(butyl methacrylate)

Cited by 31 publications

References 30 publications

Pervaporation separation of water and dioxane mixtures with sodium alginate‐g‐polyacrylamide copolymeric membranes

Pervaporation separation of water and dioxane mixtures with sodium alginate‐g‐polyacrylamide copolymeric membranes

Predicting Benzene Fluxes in NaX Membranes from Atomistic Simulations of Cooperative Diffusivities

Interplay between grain structure and protein adsorption on functional response of osteoblasts: Ultrafine‐grained versus coarse‐grained substrates

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