Study on Low Thermal-Conductivity of PVDF@SiAG/PET Membranes for Direct Contact Membrane Distillation Application

Abstract

In order to enhance the separation performance and reduce the heat loss of transmembrane for membrane distillation, the thermal efficiency and hydrophobicity of the membrane distillation need to be simultaneously enhanced. In this work, a polyvinylidene difluoride/polyethylene glycol terephthalate (PVDF/PET) hydrophobic/hydrophilic membrane has been prepared by non-solvent phase induction method. Nanosized silica aerogel (SiAG) with high porosity has been added to the composite membranes. The modifying effects and operating conditions on permeate flux and thermal efficiency in direct contact membrane distillation (DCMD) are investigated. Furthermore, the latent heat of vaporization and the heat transfer across the membranes have been compared for SiAG addition, which indicates that the composite PVDF@SiAG/PET membranes demonstrate a great potential for distillation-separation application due to their high heat efficiency.

Preparation, Modification, and Application of Ethylene-Chlorotrifluoroethylene Copolymer Membranes

“…Membrane distillation (MD) has recently gained prominence as a membrane separation process utilizing nonisothermal physical separation technology. In this technology, a hydrophobic microfiltration membrane is employed to segregate the aqueous solution [70][71][72][73][74][75]. By introducing a temperature difference across the membrane, a vapor pressure disparity is created, propelling vapor through the hydrophobic porous membrane.…”

Potential of the Novel Slot Blot Method with a PVDF Membrane for Protein Identification and Quantification in Kampo Medicines

“…PVDF membranes also boast good membrane-forming properties, thermal stability, chemical stability, and mechanical properties [33,34]. Considering that PVDF membranes are often used as filters to produce clean water, natural organic compounds in wastewater, such as proteins and oil, were selected for removal [35,36]. PVDF membranes have also been adopted with the filter blot method for atmospheric particle matter proteins [37] and for electrospray ionization mass spectrometry (ESI-MS) analysis combined with sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis (PAGE) (SDS-PAGE) and "on-PVDF membrane digestion" [38].…”