| 摘要 |
1,239,978. Ion-exchange; magnetised/ magnetisable resin particles. PERMUTIT CO. Ltd. 1 July, 1969 [15 July, 1968], No. 33666/68. Heading B1J. Ion exchange resin in the form of particles having a size of less than 295 microns, preferably less than 150 microns, and containing finely divided magnetised or magnetisable material is used in the ion exchange treatment of aqueous liquid, for example water, by a process which comprises passing the liquid in continuous manner through a bed of ion exchange resin situated in an absorber and maintaining the bed in appropriate condition by removing exhausted resin from the liquid inlet end of the bed, passing such exhausted resin through a regenerator wherein it is regenerated and returning regenerated resin to the liquid outlet end of the bed in the absorber. It is preferred that the particles, which are in a magnetised state when in each of the absorber and the regenerator, are demagnetised on leaving either the absorber or the regenerator and are remagnetised on entering either the absorber or the regenerator. The flow of liquid may be either upwards or downwards in each of the absorber and the regenerator; the movement of the particles in each of the absorber and the regenerator is in a direction opposite to the direction of flow of liquid therein. The particles may be removed from and returned to the absorber either continuously or intermittently. The particles preferably are in the form of beads comprising copolymeric material; the specification gives details of the preparation of beads which comprise sulphonated cross-linked styrene-divinyl benzene copolymer and either magnetic iron oxide or ferrite and of beads which comprise phenol-formaldehyde condensation resin and magnetic iron oxide, the beads in each case being in the sodium form. The process may be carried out in apparatus which comprises an absorber, a regenerator, a first connection between the absorber and the regenerator for effecting transfer of particles from the absorber to the regenerator, a second connection between the absorber and regenerator for effecting transfer of particles from the regenerator to the absorber, a pump situated in each connection, devices for magnetising the particles during transfer thereof from each pump to the respective absorber or regenerator and, preferably, devices for remagnetising the particles during transfer thereof to each pump from the respective absorber or regenerator, a further pump for supplying regenerant to the regenerator and a control device for starting all three pumps simultaneously; the specification discloses an illustrated embodiment of such apparatus and its use in softening water, the flow of liquid being upwards in the absorber and downwards in the regenerator. |
