Modified Amine ALDEHYDE resins and their applications in separation processes

摘要

Refers to modified Resins for use in separation processes, and especially the selective separation of solid and / or Ionic species such as metal cations from aqueous media.The modified Resins comprise a base Resin which is modified by a coupling Agent that is highly Selective for the Union with Solid Pollutants and especially siliceous materials such as Sand or Clay.In addition, a method is described that includes: (a) providing an element containing one or more impurities; b) contacting Said element with a Resin Amine aldehyde comprising a Silane coupling agent; and c) During or after the step (b) separating the impurity Complex Resin The Purified material, so that the Resin is mixed Reagents of formaldehyde, ureaTriethanolamine and optionally Ammonia at an Alkaline pH, the mixture is heated to a high temperature, and adding acid to reduce the pH to a range of 4.9 to 5.2 and add urea to the molar ratio of formaldehyde to urea in the range 1.5 to 2.5: 1: 1 and REACT during a certain time PO sufficient to reduce the free formaldehyde to less than 2%