| 摘要 |
1,260,024. Diffusion apparatus; separating gases by diffusion. E.I. DU PONT DE NEMOURS & CO. 10 Nov., 1969 [26 Nov., 1968 (2)], No. 54904/69. Headings B1L and B1X. Diffusion apparatus for separating components of gaseous or liquid systems comprises a perforated tube 19 axially located in a bundle of semi permeable hollow fibres 10 optionally looped within a fluid tight jacket 15 so that all their ends embed in and pass through a cast block 12, which closes the jacket, and open at 11 into a chamber 18 defined by the block and an outer cover 28. The bundle of fibres 10 is constrained e.g. by a porous sleeve, by intermittent bandings or by the jacket itself. In operation fluid under pressure flows from inlet 16 to the furthermost end of the jacket 15 and also radially across the fibres toward perforations 21 &c. Fluid which permeates into the fibres is withdrawn through a port 20 via the chamber 18 whilst the non-permeating component is withdrawn at port 17 via the perforations. The flow in this case is countercurrent but the inlet port 16 can be positioned so that it is concurrent or half and half. The perforated tube may additionally or only pass through the cast block 12 and exit through a second port in the chamber 18. In a modification two relatively rotatable concentric perforated tubes are used. In another modification, Fig. 12 (not shown), the jacket and outer cover contain several bundles of fibres each passing through their own cast blocks into a common "permeate take off" chamber. Many applications of the apparatus are given, e.g. the separation of hydrogen and hydrocarbons, desalination of water. |
