| 摘要 |
1488854 Separating liquids MINNESOTA MINING & MFG CO 18 Oct 1974 [19 Oct 1973] 45276/74 Heading BID A dispersion of one liquid in another (e.g. oil in water) is separated by passage through an element 14 comprising alternate sections of coalescing medium 15 and sorbing medium 16, the continuous phase flowing mainly through medium 15 which forms continuous paths from the inlet end to the outlet end of the element. The dispersed phase accumulates in the sorbing medium 16. which is preferentially wet thereby. When the medium 16 is saturated the element may be discarded or reconditioned by solvent washing or squeezing. Alternatively the flow of liquid is maintained after saturation, and the dispersed phase emerges from the medium 16 as large globules and is separated from the continuous phase in a downstream gravity separator. Fig. 2 shows a multi-layer sandwich of alternate layers of media. Figs. 4, 5 (not shown) illustrate a sandwich of annular discs forming a tubular element for inward or outward flow. Fig. 3 (not shown) illustrates a spirally wound, axial flow element of two media on a central tube which carries filtrate. In Fig. 6 (not shown) the element comprises a random assembly of pieces of the two media between flat meshes (38). In all cases the media are compressed when inserted in housing 10. Exemplified coalescing media are resin-bonded glass fibres, foam plastics and natural or synthetic fibre webs. Sorbing media are preferably webs of polyethylene, polypropylene, polystyrene, polyester and polyamide fibres of diameter less than 20 microns formed by melt blowing, or porous polystyrene spheres. The coalescing and sorbing media in an element may be chemically identical but the coalescing medium has a lower flow resistance. Dimensions of the elements and layers therein are exemplified.
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