渗透蒸发

Abstract(#br)Free-standing zeolitic imidazolate framework-71 (ZIF-71)/polydimethylsiloxane (PDMS) nanocomposite membranes with 0, 5, 25 and 40\u003cce:hsp sp=\"0.25\"/\u003ewt% ZIF-71 loadings were prepared and the pervaporation separation performance for ethanol and 1-butanol from water was measured. ZIF-71 was stable in water for seven days (both at room temperature and 60\u003cce:hsp sp=\"0.25\"/\u003e°C); the crystal structure and morphology remained the same. ZIF-71/PDMS composite membranes were formed through addition cure and condensation cure methods.

Abstract(#br)Organophilic pervaporation (OPV) has been considered as one of the most promising separation processes for the recovery of biofuels from fermentation broths, however, in addition to preferred target product – liquid biofuels, the yeast cells and fermentation nutrients could affect the recovery efficiency of biofuels from broths by pervaporation.

Abstract(#br)Sedimentation of silicalite-1 occurs in the fabrication of thin silicalite-1 filled polydimethylsiloxane (PDMS) hybrid composite membranes if the viscosity of membrane solution is low, which makes this preparation challenging. In this work, a new method that use a platinum catalytic agent to assist the pre-polymerization of PDMS polymer to increase the viscosity of the membrane solution was studied.

Abstract(#br)In this study, the extended Resistance-Based (RB) model introduced in the preceding paper, was validated for the prediction of the steady state mass transport of species through various mixed matrix membranes (MMMs) used in pervaporation and gas separation applications.

Abstract(#br)The performance of fed-batch and continuous ABE fermentations integrated with organophilic pervaporation was thoroughly tested. Poly(octyl methyl siloxane) (POMS) based pervaporation membranes were applied during fermentation and compared to the performance of polydimethylsiloxane (PDMS) based membranes. The performance of POMS based pervaporation membranes was superior both in terms of flux, separation factor and pervaporation separation index.

Abstract(#br)Zeolite (ZSM-5)/polydimethylsiloxane (PDMS)/polyvinylidene fluoride (PVDF) hollow fiber composite membrane was prepared by dynamic negative pressure. The influence of ZSM-5 silanization, coating time and concentration of ZSM-5 on the resulting pervaporation (PV) performance of composite membranes was investigated. The contact angle (CA) was used to measure surface hydrophobic property and it was found that the water contact angle of the membrane was increased significantly from 99° to 132° when the concentration of ZSM-5 increased from 0% to 50%.

Abstract(#br)Silica (SiO 2 )/polydimethylsiloxane (PDMS)/polyvinylidene fluoride (PVDF) composite membranes were prepared through a dynamic negative pressure method for phenols recovery from coal gasification wastewater (CGW) in pervaporation process. Multiple techniques including scanning electron microscopy (SEM), water contact angle (WCA) and fourier transform adsorption spectrum (FTIR) were used to examine the surface morphology, hydrophobic properties and functional groups of the modified PVDF hollow fiber membranes, respectively.

Abstract(#br)In last decade, pervaporation has been recognized as a promising novel process for desulfurization of FCC (Fluidized Catalytic Cracking) gasoline. This study deals with the comparison of the removal of different types of sulfur containing species by a spiral wound pervaporation module. For this, different binary systems containing 2-methyl thiophene, 1-butanethiol and diethyl sulfide as solute and n -heptane as solvent are selected as model gasoline. Results reported in our previous study on n -heptane/thiophene systems are also included in the analysis.

摘要\n制备了垂直排列( VA )和开放式碳纳米管( CNT )阵列填充聚二甲基硅氧烷( PDMS )复合膜，并对丙酮-丁醇-乙醇( ABE )发酵液中丁醇的渗透汽化回收进行了表征和评价。与均相PDMS膜相比，VA CNT ( open-end ) / PDMS膜表现出了各种优势，因为VA CNT ( open-end ) / PDMS膜表现出了同时提高丁醇通量和分离因子的作用，这是该膜较高的丁醇溶解度和扩散率的结果。丁醇通量和分离因子均随进料温度( 30 ~ 80℃)和进料丁醇浓度( 5 ~ 25g / L )的增加而急剧增大，80℃时VA CNT / PDMS膜的最大总通量和丁醇分离因子分别达到1093.7g / m2h和37.6。复合膜表现出稳定的性能，与发酵液长期连续运行，用于生物丁醇生产。总体而言，VA CNT ( open-ended ) / PDMS膜比均相PDMS膜具有更高的丁醇通量和选择性，在ABE发酵分离丁醇方面潜力。

Abstract(#br)A homogeneous distribution of inorganic fillers and their integration with polymer matrix is the primary challenge for advancement of mixed matrix membranes (MMMs) in pervaporation. Due to well-defined structure and multi-functional groups attached to the apex silicon atoms, polyhedral oligomeric silsesquioxane (POSS) provides a high possibility of good compatibility with diverse polymer matrix at the molecular level.