Abstract: A method of molding a micro-fibrous filter including the steps of: (a) forming an aqueous slurry of micro-fibers; (b) introducing the slurry under pressure into the top of an annular molding space so that a mass of fibers becomes compacted on a vertical cylindrical screen and liquid is discharged from the molding space through the screen; (c) increasing the effective open area of the screen by moving upwardly a sleeve in sliding contact with the screen at a rate substantially equal to the rate at which the height of the mass of fibers increases above the support; then (d) removing, drying, and curing the resulting tubular mass of fibers. Acrylate binder resin compatible with the e.g. acidic conditions needed to stabilize the resin, can form part of the fiber slurry used for molding the filter, and after filter formation and drainage can be cured by heat to form the filter.

Abstract: Apparatus is provided for separating oil from compressor condensate. It comprises a separator having an upper chamber provided with a condensate inlet and a filter housing containing a hydrophobic oleophilic substance so that in use condensate flows from the upper chamber through the filter housing under the action of gravity. The upper chamber contains a coalescing filter connected with the condensate inlet. In an alternative structure, a holding tank is series connected with a separator, and means is provided for supplying a de-emulsifying agent to condensate in the holding tank before the condensate is supplied to the separator. The above apparatus can carry out a method which comprises mixing the condensate with de-emulsifying agent, holding the mixture while emulsion cracking at least partly proceeds, and supplying the at least partly cracked emulsion to a separator containing a hydrophobic oleophilic substance.