Using dynamic membrane cross-flow filtration for oil emulsions

Release time:

2022-06-23

First, install the microporous membrane AN450 (0.45μm) in the No. 2 filter chamber shown in the table (filter chamber), and then conduct a dehydration test on the emulsion containing 1% soluble oil using the dynamic membrane formed on this microporous support.

First, install the microporous membrane AN450 (0.45μm) in the filter chamber No. 2 shown in the table, and then conduct a dehydration test on the emulsion containing 1% soluble oil using the dynamic membrane formed on this microporous support.

To form a dynamic membrane on the microporous support, the following pretreatment is required: first, wash with 0.0250% or 0.0500% colloidal silica 'Cab-O-Sil' (produced by Cabot Corporation in Boston, USA); then wash with 0.0250% or 0.0500% polyacrylic acid solution (produced by Rohm & Haas in Philadelphia, with the brand name Acrysol A3); finally, wash with a specially milled silica solution with a particle size of 3.0nm, or wash with Elvanol solution (which is polyvinyl alcohol, PVA, produced by Dupont in Wilmington, USA).

During the pretreatment process, it is necessary to record the flow rate of water. When the flow rate of water begins to stabilize, it is considered that the pretreatment time has been sufficient.

After pretreatment, dehydration of the oil emulsion can be carried out. At this time, measure the flow rate of the filtrate and perform hydrocarbon concentration analysis on the sample (IR analysis, i.e., infrared spectroscopy), and also conduct total extractable analysis using CCl4. The data for pretreatment used to form the dynamic membrane and for dehydration of soluble oil emulsions are shown in Table 2.

Conclusion

From the above experiments, the following conclusions can be drawn: compared to the microporous support that has not been pretreated, the dynamic membrane provides a more stable and higher flow rate of filtrate. The dynamic membrane behaves similarly to ultrafiltration membranes and effectively repels colloidal particles in oil. However, surprisingly, the untreated microporous support can also repel colloidal particles in oil. Clearly, this is due to the formation of a dynamic membrane on the microporous support as well. In other words, there is no pure microporous filtration; one should often consider issues beyond filtration.

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Comparison of Cross-Flow Filtration Media

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Application of Ceramic Tube Bundle Cross Flow Filter

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