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Using PP as the support layer, what effect does the thickness and structure have on the filtration e

Issuing time:2023-05-25 09:47

The performance of a composite membrane is influenced by the thickness and structure of its support layer, in this case polypropylene (PP). Here, I will outline some of the effects of thickness and structure on the filtration performance of composite membranes:
PP support membrane.jpg


Effect of thickness of PP support film on composite film
The thickness of the PP support layer plays a crucial role in the overall mechanical strength, permeability, and filtration efficiency of the composite membrane. Because a thicker support layer generally provides better mechanical strength to the composite membrane, making it more resistant to deformation, compaction and damage during handling. However, thicker support layers tend to have lower permeability due to increased resistance to flow. Therefore, they may require higher pressures to achieve the same flux as thinner supports, resulting in increased energy consumption and operating costs. Thicker support layers can improve filtration because they provide a more tortuous path for particles to pass through, resulting in better retention of contaminants, which, again, can lead to higher pressure drops across the membrane.
PTFE PP composite filter membrane.jpg


Influence of the structure of PP film as support layer on the composite film
The porosity, pore size, pore size distribution and other structures of the PP support layer will also significantly affect the filtration effect of the composite membrane. Higher porosity and larger pore sizes in the support layer can increase permeability, resulting in higher flux rates. However, larger pores can also affect filtration because smaller contaminants may pass through the support layer more easily. A uniform pore size distribution of the membrane is desirable for consistent filtration performance. A wider pore size distribution results in a more pronounced change in filtration effectiveness, as smaller pores are more prone to clogging, resulting in fouling and reduced permeability.
PTFE PP composite membrane.jpg


From the above analysis, it can be seen that the thickness and structure of the PP support layer will affect the mechanical strength, permeability and filtration efficiency of the composite membrane. A balance between these factors is critical to optimize membrane performance. Further optimization can be achieved by considering specific application and operating conditions such as the type of contaminants, feed composition and desired flux rate, while we need to look at the properties of the PP support layer such as its thickness, pore size and surface area ;Find a balance between pore size and permeability to achieve ideal filtering effect. Different PP support layers can be thoroughly tested and analyzed to determine the best combination of thickness, pore size and surface area. This can be done through experiments and simulations and gathering feedback from customers and stakeholders.

Citation

1.Fane, A. G.,& Wang, R. (2002). Polypropylene support membranes for membranebioreactors. Journal of Membrane Science, 209(2), 393-404.

2.Lee, S., &Kim, J. (2014). Preparation and characterization of polypropylene supportmembranes for water treatment. Journal of Industrial and Engineering Chemistry,20(4), 1531-1536.

3.Chen, J., et al.(2019). Preparation of polypropylene support membranes with enhanced mechanicalproperties for membrane distillation. Journal of Membrane Science, 579, 72-81.

4.Xie, Y., et al.(2020). Preparation and characterization of polypropylene support membranes forforward osmosis. Separation and Purification Technology, 249, 117168.

5.Yang, T., et al.(2021). Preparation of polypropylene support membranes with tunable surfacemorphology and hydrophilicity for membrane distillation. Journal of MembraneScience, 618, 118624.


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