MODIFIED PHENOLIC RESINS, METHOD FOR THEIR PREPARATION AND THEIR USE AS SELECTIVE METAL CHELATING AGENTS

摘要

Modified phenolic resins are prepared by condensing approximately equimolar quantities of a phenolic component comprising one or more phenols, and a diamino component comprising one or more di-(secondary amino) compounds with approximately twice the molar quantity of formaldehyde under Mannich reaction conditions. Mercury and copper ions may be removed very selectively from aqueous solutions using the new resin.