Is there a limit on the pH range for the filter elements used in coalescers? If so, what is the limit?
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The separation filter element of the coalescer achieves water removal through oil affinity and water repellency. If other substances are dissolved in the water, causing the pH to become acidic or alkaline, this changes the wetting properties of the aqueous solution – does this have an impact on the separation process?
Changes in the pH of the solution not only have an impact on separation filters, but may have an even greater effect on coagulation filters. Impurities such as acidic or alkaline substances and metal ions dissolved in water can reduce the interfacial tension IFT of the two-phase liquid (similar to the effect of surfactants), thereby affecting the efficiency of coagulation. Therefore, the choice of filter media for coagulation filters varies depending on the pH level； It is recommended to consult a professional manufacturer.
In the separation industry, the primary principle is chemical compatibility. If the properties of the fluid change significantly, it may cause corrosion of the filter element supports or swelling of the filtering material; in severe cases, the filter element itself can disappear. I’ve seen many such cases. The wettability you mentioned should refer to interfacial tension; this only has an impact in terms of quantity, so the effect is minimal.
In the separation industry, the primary principle is chemical compatibility. If the properties of the fluid change significantly, it may cause corrosion of the filter element supports or swelling of the filtering material; in severe cases, the filter element itself can disappear. I’ve seen many such cases. The wettability you mentioned should refer to interfacial tension; this only has an impact in terms of quantity, so the effect is minimal.