| 摘要 |
1,140,852. Ion-exchange. R. F. HUNTER. 26 Jan., 1966 [29 Jan., 1965], No. 3429/66. Heading B1J. In a cyclic process used to remove at least part of a component from a fluid containing it, each cycle includes a fluid treatment step comprising passing the fluid through a fixed bed of particles capable of taking up the component from the fluid and a regeneration step comprising passing through the bed a regenerant fluid capable of taking up the component from the bed, at least one of the treatment step and the regeneration step being carried out at a rate of flow and for a period of time such that under steady state conditions at least 50% of the length of the bed is actively taking up the component from the fluid to be treated throughout the treatment step, and at least 50% of the length of the bed is actively giving up the component to the regenerant fluid during the regeneration step. The "steady state conditions" are when the fluid is passing completely through the bed. Examples relate to purification of sea water having hardness of 89.6 meq./litre magnesium and 18.4 meq./litre calcium and of tap-water having total hardness 2.70 meq/litre using a polystyrene sulfonic acid ion exchange resin. |
