Membrane and Water Treatment

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Effect of spinning parameters of polyethersulfone based hollow fiber membranes on morphological and mechanical properties

  • Tewfik, Shadia R. (National Research Centre, Engineering Research Division, Chemical Engineering and Pilot Plant Department) ;
  • Sorour, Mohamed H. (National Research Centre, Engineering Research Division, Chemical Engineering and Pilot Plant Department) ;
  • Shaalan, Hayam F. (National Research Centre, Engineering Research Division, Chemical Engineering and Pilot Plant Department) ;
  • Hani, Heba A. (National Research Centre, Engineering Research Division, Chemical Engineering and Pilot Plant Department)
  • Received : 2016.10.25
  • Accepted : 2017.10.09
  • Published : 2018.01.25
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Abstract

Hollow fiber (HF) membranes are gaining wide interest over flat membranes due to their compaction and high area to surface volume ratio. This work addresses the fabrication of HF from polysulfone (PS) and polyethersulfone (PES) using N-methylpyrrolidone (NMP) as solvent in addition to other additives to achieve desired characteristics. The semi-pilot spinning system includes jacketed vessel, four spinneret block, coagulation and washing baths in addition to dryer and winder. Different parameters affecting dry-wet spinning phase inversion process were investigated. Dope compositions of PES, NMP and polyvinyl pyrrolidone (PVP) of varying molecular weights as additive were addressed. Some critical parameters of importance were also investigated. Those include dope flow rate, air gap, coagulation & washing baths and drying temperatures. The measured dope viscosity was in the range from 1.7 to 36.5 Pa.s. Air gap distance was adjusted from 20 to 45 cm and coagulation bath temperature from 20 to $46^{\circ}C$. The HF membranes were characterized by scanning electron microscope (SEM), atomic force microscope (AFM) and mechanical properties. Results indicated prevalence of finger like structure and average surface roughness from about 29 to 78.3 nm. Profile of stress strain characteristics revealed suitability of the fibers for downstream interventions for fabrication of thin film composite membrane. Different empirical correlations were formulated which enable deeper understanding of the interaction of the above mentioned variables. Data of pure water permeability (PWP) confirmed that the fabricated samples fall within the microfiltration (MF)-ultrafiltration (UF) range of membrane separation.

Keywords

Acknowledgement

Grant : Technological and Engineering Development for Production of Desalination Hollow Fiber Membranes

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