SELECTIVE ION-EXCHANGERS MOULDING PLASTIC ARTICLES
1430578 lon exchange of boron or arsenic compounds UNITED STATES BORAX & CHEMICAL CORP 6 Sept 1973 [8 June 1972 26 Oct 1972] 26730/72 and 49474/72 Heading C1A [Also in Division C3] Anions or acids containing boron or arsenic are removed from their aqueous solutions by contact with an ion exchange resin formed by polymerization of an aryl hydroxy compound and an aldehyde, wherein the resin initially contains boric acid or a borate which is removed from the ion exchange resin before use. The resin used may be formed by the polymerization of a preformed complex of boron and a polyhydric aryl hydroxy compound and an aldehyde. The contact with the ion exchange resin may take place in the presence of a basic catalyst, optionally a hydroxide of an element of Group Ia or IIa of the Periodic Classification.