| 摘要 |
<p>A phenolic chelate resin has a chelate-forming group, wherein hydrogen atoms in a primary or secondary alkylamino group introduced in a phenol nucleus are substituted by a methylenephosphonate group. …<??>The phenolic chelate resin is produced by reacting a compound having a phenolic hydroxyl group and a primary and/or secondary alkylamino group in the same molecule with phosphorous acid and formaldehyde in the present of a mineral acid. The reaction is allowed to continue in order to form a reaction product wherein some or all of the hydrogen atoms in the alkylamino group are replaced by a methylenephosphonate group whereafter the resulting reaction product is condensed with a phenol and …<??>In order to recover a heavy mctal ion from an aqueous solution by selective adsorption, the solution is contacted with the phenolic chelate resin at 5 to 95 DEG C for 1 minute to 50 hours to allow a chelate to form.</p> |
