1. Purpose of Liquid Filtration:

* To achieve a certain degree of separation between media in a multi-media liquid.

* To achieve a certain degree of reduction in the volume of media or liquids in a single-media liquid.

2. Function of Liquid Filtration Membranes:

* The pore size allows separation of media of different particle sizes.

* The molecular weight cutoff allows separation of organic media of different molecular weights.

3. Working Modes of Liquid Filtration Membranes:

* Surface Retention: The media is retained in the liquid.

* Deep (Core) Retention: Part of the media is retained in the liquid, while the remaining part is retained in the core layer of the membrane and is discarded along with the membrane.

Based on the above information, the type and pore size can be roughly determined, but this is still not enough:

4. Applicability and Compatibility of Membrane Materials:

4.1 Hydrophilic filtration membranes are suitable for aqueous liquids, while hydrophobic filtration membranes are suitable for organic liquids.

4.2 The membrane material must be chemically compatible with the liquid and will not corrode or dissolve, and there must be no shedding or leaching.

4.3 The membrane must withstand operating pressure and temperature, exhibit minimal deformation, and maintain stable operating parameters.

4.4 Applications such as pharmaceuticals and food require consideration of material cleanliness and safety.

4.5 Applications such as medical treatment, testing and analysis, and life sciences also require consideration of factors such as cytotoxicity and heat generation.

4.6 For protein-based liquids, the adsorption properties of the membrane material should also be considered.

5. How to ensure membrane separation accuracy:

5.1 The membrane pore size must have a small positive and negative tolerance, and the proportion of effective pores must be high (asap).

5.2 For separations of media with similar particle sizes or molecular weights, it is necessary to consider differences in media charge to select an appropriately charged membrane.

6. How to ensure membrane efficiency:

6.1 The membrane must have low pressure loss, resulting in higher flow rates at the same operating pressure.

6.2 Thin, symmetrically structured single-layer membranes exhibit lower resistance and higher operating parameters than supported composite membranes.

6.3 High porosity and high flow rates.

6.4 Stronger membranes can withstand higher operating pressures, resulting in higher flow rates and operating efficiency.

6.5 Membranes with lower water contact angles have better hydrophilicity, lower resistance, and higher flow rates.

7. Membrane Lifespan and Cost of Use:

7.1 Surface-retention membranes can be restored by backwashing and have a long, repeatable service life.

7.2 Deep-retention membranes have poor backwashing performance and require timely replacement.

8. How to objectively compare and evaluate membrane products from different suppliers.

8.1 The professionalism of the supplier representative, their understanding of your industry and purpose.

8.2 Compare product types and core data from different suppliers.

8.3 Compare theoretical data under the same test conditions.

8.4 Maximum operating pressure and deformation resistance, and the difference between actual operating data and theoretical test data.

8.5 Compare and evaluate supplier qualifications and services.

8.6 Evaluate the cost-effectiveness of membrane products that meet your requirements.

At this point you should be able to make the right choices and decisions.

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