Skip to Content
Find More Like This
Return to Search

Membranes – Phosphazene

Idaho National Laboratory

Contact INL About This Technology

Technology Marketing Summary

INL’s new phosphazene membrane technology provides a method for making polydichlorophosphazene using solid state reactants that simplifies previous processes with a “single pot” two-step process. The process eliminates use of chlorinated hydrocarbon solvents, reducing the costs of equipment and increasing economies. Polyphosphazene polymers are inorganic in nature and consist of alternating phosphorus and nitrogen atoms with alternating double and single bonds.

Phase one of the process requires ammonium sulfate and phosphorus pentachloride to be heated at 150 to 180oC for a period of time (e.g. 5-300 minutes depending on the desired production amount of P-trichloro-N; (dichlorophosphoryl) monophosphazene). In phase two, the product from phase one is heated in a dry nitrogen or argon atmosphere until oxyphosphoryltrichloride is distilled off. Temperatures of 200 to 300oC are required for this process and a time frame of 2 to 500 minutes.


These polymers can be used at both high and low temperatures and in caustic and acidic environments. Polyphosphazene can be used in a membrane to separate individual gases from gas mixtures, as well as to separate polar and nonpolar gases. Phosphazene Polymers are valuable in several industries including: environmental cleanup, mineral processing and potential for use in dentistry, aerospace and military. Other uses include producing “potable water” from sea water, recovering valuable constituents of solutions by electrolysis, and to separate, remove, purify, or partially recover individual components of gas mixtures.


-        Produces materials for many purposes (e.g. environmental cleanup, military, aerospace, etc),

-        Capable of producing potable water from sea/salt water, and

-        Separates, removes, and purifies individual components of mixtures.

Applications and Industries

Polymers, polyphosphazene, separation membrane

Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
6,309,619 7,074,256ProductionAvailable08/31/201208/31/2012

Contact INL About This Technology

To: Ryan Bills<>