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Molecular design and fabrication of PIM-1/polyphosphazene blend membranes with high performance for CO2/N2 separation

Journal Article · · Journal of Membrane Science
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [1];  [3]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); NETL Support Contractor, Pittsburgh, PA (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)

New polymeric blend membranes for CO2 separation were synthesized based on insights from molecular dynamics simulation. A molecular-level structure-property relationship in polymers of intrinsic microporosity (PIM) based blend membranes, was investigated in detail computationally. Calculated local density profiles and energy of interaction of the blend membranes, composed of PIM-1 and various polyphosphazenes, showed that using the polyphosphazene with a higher concentration of ether side chains can improve the compatibility with PIM-1. Furthermore, based on the findings of computational studies, blend membranes were experimentally fabricated from PIM-1 and polyphosphazenes with various polyether side chain concentrations. Polyether concentration in polyphosphazenes was correlated with the film properties and gas transport performance of the blend membranes. Blend membranes showed very high CO2 permeability (3100-5300 barrer) and improved CO2/N2 selectivity (24-28), outperforming all other PIM-based blend membranes reported to date. Moreover, the CO2 permeability performance of the blend membranes was tested 566 hours under real post-combustion flue gas from a coal-fired power plant, including CO2, N2, H2O, O2, SOx and NOx.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
89243318CFE000003
OSTI ID:
1869467
Alternate ID(s):
OSTI ID: 1862609
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Journal Issue: None Vol. 640; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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