Dehydration of acetic acid/water mixtures by pervaporation with a modified poly(4-methyl-1-pentene) membrane

Hydroxyl-terminated polybutadiene (HTPB), 4,4 0 -dicyclohexyl methane diiscyanate (H 12 MDI), and 1,4-butane diol are used to synthesize polyurethane (PU) solutions by two-stage process. Interpenetrating networks (IPNs) of HTPB-based PU and poly(methyl methacrylate) (PMMA) with HTPB/MMA (wt/wt % ratio) 5 2.0, 1.5, 1.0, 1.5, 0.8, and 0.6, which are designated as IPN1 to IPN5, respectively, are synthesized by sequential polymerization technique. Thermal properties, tensile strength, and contact angle of membranes increase with the increase of MMA content, while the elongation of membranes show the reverse trend. Characterization of membranes are investigated by C¼ ¼C/C¼ ¼O absorption ratio and infrared absorption frequency shiftment. These PU and IPN membranes are used for the separation of ethanol/water and isopropanol/water solution by pervaporation test. IPN3 membrane possesses the largest pervaporation permeability and the separation factor. The pervaporation results of ethanol/ water feed has the same trend as that of isopropyl alcohol (IPA)/water solution.

Section: Methodsmentioning

confidence: 99%

“…22,23 The effective membrane area in contact with the feed solution is 7.0686 cm 2 . The membrane is supported by filter paper on a sintered stainless steel disk.…”

Section: Pervaporation Measurementsmentioning

confidence: 99%

Properties and pervaporation separation of hydroxyl‐terminated polybutadiene‐based polyurethane/poly(methyl metharcylate) interpenetrating networks membranes

Tsai

Huang

Chang

et al. 2007

“…A traditional pervaporation process was used 21. In pervaporation, the feed solution of 90 wt % ethanol solution was in direct contact with the membrane and kept at 25°C.…”

Section: Experimental and Methodsmentioning

confidence: 99%

Pervaporation separation of water/ethanol mixture using asymmetric ion‐exchange membranes containing aluminum ions

Chen

Liou

Shih

et al. 2007

Self Cite

ABSTRACT:The asymmetric aluminum ion exchange polysulfone membranes have successfully been prepared for the dehydration of ethanol-water mixture. The relationship between the membrane morphology, separation performance, and the ion content of membranes were discussed in this study. The experimental results showed that the separation performance of those membranes was increased upon increasing the degree of aluminum ion exchange in polysulfone membranes. Both permeation rate and separation factors of those membranes increased with increasing the degree of ion exchange. The increase in separation performance of aluminum ion exchange membranes was mainly attributed to ion crosslinking in polymer network and the hydration effects of exchanged ion in membranes. On the other hand, the operating temperature in the PV process showed a significant influence on the dehydration of water molecules in the permeate. An increase in temperature increased the permeation flux of permeate but slightly decreased its selectivity. The aluminum asymmetric ions in membranes showed a strong influence on permselectivity of asymmetric ion exchange membranes.

“…A traditional pervaporation process was used 19. In pervaporation, a feed solution of 90 wt % ethanol was in direct contact with the membrane and was kept at 25°C.…”

Section: Methodsmentioning

confidence: 99%

Pervaporation separation of a water/ethanol mixture by a sodium sulfonate polysulfone membrane

Hung¹,

Chen²,

Liou³

et al. 2003

Self Cite

A sodium sulfonate polysulfone membrane was prepared for the dehydration of a water/ethanol mixture by pervaporation. The separation performances of water and ethanol were examined by the testing of the ethanol/ water mixture under operating conditions. The permselectivity of the sodium sulfonate polysulfone membrane was found to strongly depend on the sodium content in the membrane. The sodium sulfonate ratio showed a significant influence on the hydrophilicity and diffusion behavior of the polysulfone membrane. Moreover, the difference in the diffusion of the permeates played an important role in the sulfonate polysulfone membrane. It was found that a highperformance pervaporation membrane could be achieved with a sodium sulfonate polysulfone membrane.