| 摘要 |
1383818 Filter aids BAYER AG 9 March 1972 [12 March 1971] 10946/72 Heading BID [Also in Division Cl] A liquid suspension is filtered by passage through a filter body precoated with a filter acid, wherein the precoat is formed by contacting the filter body with a homogeneous suspension of ground polyacrylonitrile or polyamide fibres, still retaining a fibrous structure, to form a homogeneous coating. Suitably, the ground fibres have a denier range of 1 to 50 dtex and are added in a quantity of 125 to 1250 g. per sq metre of filter surface. Active carbon and/or an ion exchanger may be added to the ground fibres when forming the precoat. The filter apparatus may comprise a plurality of horizontal or vertically upstanding or depending filter candles formed of stainless steel, fibres or other sintered materials. The examples relate to the treatment of condensates from heat-generating stations, saccharine juices and electrolyte solutions. |
