What is a Chloride Anion Dealkalizer

Chloride Anion Dealkalizers are primarily, used for the removal of alkalinity from boiler feed water. Removal of the alkalinity prevents insoluble carbonate precipitates from forming in the boiler tubes and stops corrosion, which may be due to carbonic acid formation. Dealkalization by ion exchange uses strong base anion resin, which is regenerated to the chloride form. A small amount of sodium hydroxide (caustic soda) may be utilized along with the sodium chloride (NaCl) to give slightly higher capacity and lower leakage.

Chloride Anion Dealkalizers will remove 90-95% of the carbonate (CO3) and bicarbonate (HCO3) alkalinity as well as 99% of the sulfates (SO4), nitrates (NO3) and fluoride when regenerated with salt (NaCl) only. Dealkalizers will remove all of the CO2 and give higher capacities when regenerated with both salt and sodium hydroxide (caustic soda).

Chloride anion dealkalizers normally use an economy salt setting of 6 lbs of salt per cubic foot of resin. Caustic may be added at a dosage of 0.6 lbs per cubic foot of resin. The capacity of the dealkalizer is based on the chloride content of the raw water.

System control can be provided using either VIP demand initiated controller or mechanical time clock, steel or fiberglass tanks.

Chloride Anion Dealkalizers with valve nest construction are available for high flow applications.

VIPE controller – This computer based demand initiated (metered) controller operates from 1 to 4 units, in either a parallel, alternating, electronic time clock or progressive configuration. The control will utilize alpha numeric, self-prompting programming for simple start up. EEPROM memory shall store the program data eliminating the need for a battery back-up or configuration input after power loss. It is prewired and includes twist lock electrical
end connectors for installation ease.

The controller will constantly monitor current operating conditions and is capable of displaying instantaneous flow rate throughout the system. Flow and operational data for each unit shall be independently displayable. A
resettable totalizing flow counter will be included to measure the total water processed.

The controller shall be self-diagnostic and capable of emitting an audible signal if it detests a system problem.  The *UL listed controller operation will be 24V, 60 Hz, 1 ph and a suitable sized UL approved transformer(s) will
be provided to convert 120V, 60Hz, 1ph power for system operation. A NEMA 4X enclosure will be used to house the controller.

The VIP demand initiated controller offers a chemical feed pump relay. This chemical feed pump relay logic circuit provides a signal to activate an optional chemical feed pump to pre-feed sodium hydroxide (caustic soda) during
regeneration, thereby increasing the capacity of tank’s resin bed.

Mechanical Time Clock control can be set with dials to regenerate daily at a pre-set time of day, or it can be set to skip a day or several days. Regeneration is automatic. The control operates the multiport valve and advances it
through the various regeneration steps of backwash, brine draw, slow rinse, fast rinse and refill of the brine tank.

Note: The dealkalizer’s anion resin must be protected from hardness fouling. ECI recommends installing a water softener ahead of the Dealkalizer to prevent anion resin fouling.

(*) Denotes new controller features