SCAMBIATORI CATIONICI INORGANICI EPROCEDIMENTO PER LA LORO PREPARAZIONE.

摘要

The inorganic cation exchangers according to the invention are constituted by acid phosphates or arsenates of tetravalent metals in solid solution with each other or with part of the phosphate or arsenate groups substituted by phosphite groups. …The process for preparing cation exchangers containing phosphite groups comprises reacting in the aqueous phase a compound of a tetravalent metal with one of the following pairs of acids: phosphoric-phosphorous and arsenic-phosphorous. Crystallisation has been obtained by boiling under reflux, by heating in an autoclave to a temperature of less than 300 DEG C, and also by conducting the reaction in the presence of a complexing agent for the tetravalent metal.