| 摘要 |
1,068,332. Filtering liquids; purifying solids by filtration. GLAXO LABORATORIES Ltd. Nov. 6, 1963 [Nov. 20, 1962], No. 43876/62. Heading B1D. A suspension of clay-like or jelly-like material (e.g. hydrated alumina) is forced by a pump 8 from a reservoir 2 up a filter tube 10 at a rapid rate such that a thin layer of particles is formed and maintained on the surface and acts as a filter medium. Filtrate is collected in a vessel 11. Where the intention is to purify the solid, fresh liquid is introduced at 6 through a constant-level device 7, until the desired degree of purity has been reached, whereupon the supply at 6 is cut off and the circulation is continued, to concentrate the suspension. The tube 10 may be of synthetic fabric optionally supported externally with wire mesh, or of gauze or of porous plastics, metals or ceramics. Rapid flow rate may be achieved by flattening the filter tube or locating a rod within it or, for inward flow, enclosing it in an imperforate tube. The method may be adapted to the purification of fermentation liquors, e.g. to remove mycelium. |
