Meta Filter Essay

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Introduction: Principle: Meta filter is a type of pressure filter. Pressure filters feed the product to the filter at a pressure greater than that which would arise from gravity alone. This is the most common type of filter used in the processing of pharmaceutical products. Meta filter functions as a strainer (service filtration) for the separation of particles. In this method, metal rings contain semi circular projections, which are arranged as a nest to form channels on the edges. This channel offers resistance (strainer) to the flow of solids (forced particles). The clear liquid is collected into a receiver from the top Construction: In its simples form, the meta filter consists of a grooved drainage rod on which is packed a series of metal rings. These rings, usually of stainless steel, are about 15 mm inside diameter, 22mm outside diameter and 0.8mm in thickness, with a number of semi circular projections on one surface. The height of projections and the shape of the section of the ring are such that when the rings are packed together, all the same way up, and tightened on the drainage rod with a nut, channels are formed that taper from about 250m down to 25m. One or more of these packs is mounted in a vessel, and the filter operated by pumping in the slurry under pressure. In this form the meta filter can e used as a strainer for coarse particles, but for finer particles a bed of a suitable material (such as a filter aid) is first built up over the rings. The pack of rings, therefore, serves essentially as a base on which the true filter medium is supported. Operation: These meta filters are placed in a vessel and may be operated by pumping the slurry under pressure or occasionally by the application of reduced pressure to the outlet side. The slurry passes through the channels formed on the edges between the rings. The clear

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