METHOD TO REGENERATE CATIONITE Russian patent published in 1995 - IPC

FIELD: desalinization of natural and waste water. SUBSTANCE: spent ionite as a product of hydrogen cationization is regenerated by two portions of sulfuric acid solution. The solution is produced by acid desorption from anionite with acid preliminary absorbed from spent regenerating solution and washing off water with (6 - 12):1 water/anionite ratio. From 60 to 80 per cent of total volume is used for the first portion of regenerating solution, and from 3 to 18 per cent is used for the second portion followed by strengthening by acid up to 4 to 9 per cent by weight. Total water volume residuals passed through anionite are used to wash off cationite. EFFECT: decreased specific flow rate of acid to recover exchange capacity of cationite by a factor of 1.3 - 1.5 at the expense of increased degree of acid utilization by 27 - 43.5 per cent, as well as decreased salt release to environment. 1 tbl