Linear polyphenols - their method of preparation and use as sequestering agents in the separation of sodium from caesium in aqueous effluents

摘要

The invention relates to linear polyphenols, their method of preparation, sequestering agents and a method of separating the sodium from the caesium in aqueous effluents. The aim of the invention is to improve the selectivity between sodium and caesium. This goal is achieved with the help of a process that consists of : ```- adding to the aqueous effluent to be treated, at least one agent for sequestering the caesium with the formula (I) : ```in which n is a whole number from 5 to 10, and then ```- passing said effluent through a charged porous membrane or a nanofiltration membrane by applying a pressure difference between the two opposite faces of said membrane, in such a way that a permeate containing sodium impoverished in caesium and a retained portion enriched in caesium are collected.