| 摘要 |
1,225,273. Ion-exchange. CRANE CO. 7 March, 1968 [3 April, 1967], No. 11260/68. Heading B1J. Regenerating of a separated bed of cation and anion exchanger takes place in three stages. An upper portion of the upper (anion) exchange bed is regenerated with metal alkali then the metal is replaced with ammonia at the same time affecting any cation exchanger entrained in the upper portion of the bed and finally regenerating with acid and ammonia the cation exchange bed. The beds or the portion may be separated. |
