DOWEX Resins for Fluoride Removal from Water or Air

 
Fluorine - F

The Group VIIA elements (fluorine, chlorine, bromine, iodine) are commonly referred to as halogens. Halogen atoms are characterized by an electronic structure where they are missing one electron so they readily form the anion X-.

Fluoride has long been added to drinking water to help prevent tooth decay. When devloping teeth are expoed to high levels of fluoride, the adult teeth will have a mottled appearance called fluorosis.

Applications

Potable Water: Fluoride is a very low selectivity anion so it can not be removed from water without first removing all of the higher selectivity anions like chloride or sulfate. Anions are removed according to their selectivity as described in the table of selectivity data  (82K PDF).

Fluoride can be selectively removed. Dow is in the process of developing a high capacity, beaded alumina for this application. If you have a commercial fluoride removal application, please Contact Us via the link on this page. Please include information about your particular fluoride removal application.

Wastewater: Under acidic conditions, fluoride is present as HF and can be removed from solution with an acid absorber like DOWEX™ M-43 resin. Under neutral to basic conditions,  DOWEX 21K XLT resin has the strong base functionality needed to split the salt. For streams that have a high organic content and are prone to surface fouling, DOWEX MARATHON™ MSA strong base anion exchange resin is recommended. Anions are removed according to their selectivity as described in the table of selectivity data (82K PDF).

Acid Vapor Capture: Halogen acid gases cause corrosion problems in a wide variety of applications. For information on corrosion control, please go to DOWEX M-43 resin.

DOWEX Ion Exchange Resins

Product Description Type Matrix Total
Exchange
Capacity*
eq/l (kgr/ft3)		 Available
Forms
DOWEX M-43 Corrosion control with DOWEX M-43 ion exchange resin. Weak Base Anion Styrene-DVB, Macroporous 1.55 FB (Free Base) form
DOWEX 21K XLT Uniform particle size, high capacity, strong base anion exchange resin for mineral processing applications. Type I Strong Base Anion Styrene-DVB, Gel 1.4 Cl-
DOWEX MARATHON MSA Uniform particle size, high capacity, macroporous strong base anion exchange resin for water demineralization applications. Type I Strong Base Anion Styrene-DVB, Macroporous 1.1 (24.0) Cl-


®™* Trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow