Skip to Content
Find More Like This
Return to Search

Phosphazene Membranes for Gas Separations

Idaho National Laboratory

Contact INL About This Technology

Technology Marketing Summary

Researchers at INL have developed novel membrane materials for the selective removal of polar gases from non-polar gases, such as methane. 


The INL phosphazene membranes are mechanically durable, as well as flexible, permitting their application for a wide variety of uses. They are effective when used in challenging environments, such as high temperatures (stable at approximately 300 degrees Celsius), various pressures and corrosive situations. These materials are much simpler, costs less, and are stable in various environments.


Operable below ambient temperatures, Specific separation, durability, Simple, less costly, stable in challenging environments.

Applications and Industries

Industrial gas (CO2, etc) separations from flue gases and/or other by-product gas streams

H2S removal from natural gas streams (sour gas upgrading).


More Information

Patent number 7,074,256


Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Patent 7,074,256
Phosphazene membranes for gas separations
A polyphosphazene having a glass transition temperature ("T.sub.g") of approximately C. or less. The polyphosphazene has at least one pendant group attached to a backbone of the polyphosphazene, wherein the pendant group has no halogen atoms. In addition, no aromatic groups are attached to an oxygen atom that is bound to a phosphorus atom of the backbone. The polyphosphazene may have a T.sub.g ranging from approximately C. to approximately C. The polyphosphazene may be selected from the group consisting of poly[bis-3-phenyl-1-propoxy)phosphazene], poly[bis-(2-phenyl-1-ethoxy)phosphazene], poly[bis-(dodecanoxypolyethoxy)-phosphazene], and poly[bis-(2-(2-(]- . The polyphosphazene may be used in a separation membrane to selectively separate individual gases from a gas mixture, such as to separate polar gases from nonpolar gases in the gas mixture.
Idaho National Laboratory 07/11/2006
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated

Contact INL About This Technology

To: Ryan Bills<>