Tunable Polyimide and Resulting Carbon Molecular Sieve Membranes for Gas Separation

Fuels and Petrochemicals Division
AIChE Spring Meeting and Global Congress on Process Safety
May 1, 2013 - 8:00am-8:30am

Polymer membranes have been used for natural gas and olefin-paraffin gases separations successfully. However, the separation performance is limited by a productivity and efficiency trade-off upper bound. Therefore, advanced carbon molecular sieves (CMS) materials were developed. These materials show separation performance that exceeds the polymer “upper bound” for gas separations, while potentially maintaining economically attractive manufacturing. CMS membranes can be formed by thermal decomposition of polymer precursors, and contain “micropores” of 6–20 Å connected by smaller so-called “ultramicropores”. The combination of ultramicropores and micropores provides the molecular sieving function and high permeability characteristics of these unusual CMS membranes.

We synthesized diverse but systematic sets of co-polyimides, containing symmetric and asymmetric polymer backbone structure, to explore effects of matrix rigidity and packing of precursor polyimides on final CMS properties. We also explored the interaction of pyrolysis conditions on final CMS properties.   Permeation was tested using both pure gases (He, O2, N2, CO2, CH4,C2H4, C2H6, C3H6, C3H8) and mixed gases for both the polyimide precursor membranes as well as the resulting CMS membranes. We correlated separation performance of precursor polyimides and formation conditions with the CMS membranes’ gas separation performance. This research provides an improved fundamental framework to guide the systematic understanding and fabrication of CMS membranes for important energy intensive separations.

Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.


Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Fuels and Petrochemicals Division Members Free Free access
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members Free Free access