The demineralization is a chemical-physical process, generally applied to the water, destined to totally or partially dissolved salts elimination.
Simpec produces two types of demineralization plants: ion exchange resin plants and reverse osmosis plants.
The obtained water is called demineralized or deionized. The ions contained in to the water ensure current conduction, their elimination reduces the water conductivity and so it increases water resistivity.
Ion exchange resin plants
Ion exchange resin plants usually consist of a cationic resin treatment section and an anionic resin treatment section.
These resins have activated functional groups, that are able to exchange their ions with ions of the same charge contained in the solution they are in contact with.
Cationic resins eliminate cations and anionic resins eliminate anions.
Using cationic and anionic resins mixture, Simpec provides ultrapure demineralized water plants with conductivity < 0,1 µS/cm.
Reverse osmosis units
Reverse osmosis plants use the membrane selectivity to obtain the water demineralization.
This process doesn’t consist only of a physical obstacle (produced by the membrane pores dimensions) to the passage of the molecules, but it use the different chemical affinity of the solutions with the membrane, permitting the hydrophile molecules (or water-like) passage.
This method uses the tangential filtration principle, like other separation techniques by the use of membranes as the ultrafiltration, microfiltration and the MBR membrane bioreactor (see Membrane technology).