(697c) Natural Gas Sweetening By MOF-Polymer Hybrid Membranes with Tailored Formulation | AIChE

(697c) Natural Gas Sweetening By MOF-Polymer Hybrid Membranes with Tailored Formulation


LIU, Y. - Presenter, Georgia Tech
Koros, W., Georgia Tech
Chen, Z., King Abdullah University of Science and Technology
Liu, G., Nanjing Tech University
Belmabkhout, Y., King Abdullah University of Science and Technology
Eddaoudi, M., King Abdullah University of Science and Technology

Gongping Liu Liu, Yang 2 15 2019-04-08T18:24:00Z 2019-04-08T18:24:00Z 1 455 2598 NJTech 21 6 3047 16.00

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Gas Sweetening by MOF-Polymer Hybrid Membranes with Tailored Formulation

Liu1, Zhijie Chen2, Gongping Liu1, Youssef
Belmabkhout2, Mohamed Eddaoudi2,*,
William J. Koros1,*

1 School of Chemical &
Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr. NW, Atlanta, GA 30332, USA

2 Functional Materials Design,
Discovery and Development research group (FMD3), Advanced Membranes
& Porous Materials Center, Division of Physical Sciences and Engineering,
King Abdullah University of Science and Technology, Thuwal
23955-6900, KSA

Worldwide energy consumption has grown
steadily with continuing increases in world population and economic growth of
developing countries. Natural gas is particularly attractive to meet these
energy needs, and consumption of natural gas will continue to rise over the
next several decades. Although CH4 is the main component of natural
gas, acidic CO2 and H2S usually must be removed before
delivery to the pipeline to avoid corrosion of processing and transporting
equipment. Pipeline specifications for H2S (< 4 ppm in U.S.) are much
stricter than for CO2 (< 2% in U.S.) because of the additional extremely
toxic nature of H2S.  Currently, roughly 30% of proven natural gas
resources in the U.S. require treatment due to excessive CO2 and H2S
concentration.  In addition, 40% of
worldwide natural gas resources are estimated to be contaminated with high
concentration (up to 20 mol.%) of H2S. Fortunately, membrane processes
offer potential compact, energy-saving approaches to address such challenges,
as compared to traditional thermally driven gas amine absorption processes. Unfortunately,
organic polymer membranes face a trade-off limit between permeability and
selectivity, while inorganic molecular sieving membranes face a challenge of
reproducibility and economical scale-up. A practical approach to overcome these
drawbacks is to create hybrid mixed matrix materials (MMM) by dispersing a
molecular-sieve phase (filler) in a continuous polymer (matrix). Such hybrids combine
the advantages of both inorganic membranes, e.g. high intrinsic permeability
and selectivity, and organic polymer membranes, e.g. robust processing and
mechanical properties. Here, we report promising features of MMMs based on
metal organic frameworks (MOFs) with tailored internal electrostatic
environments for simultaneous removal of H2S and CO2 from
natural gas. Using M-fcu-MOFs
and 6FDA-based polyimides, MOF-polyimide hybrid membranes show extraordinary
performance on H2S/CH4 separation under various H2S
concentrations, well above the trade-off
limit of polymer membranes
. Moreover, the membranes maintain high CO2/CH4
separation efficiencies. Among the M- normal">fcu-MOFs studied, Zr-fum-fcu-MOF is
considered as the best performing filler with the highest H2S and CO2
removal efficiencies. Our interpretation of both sorption and diffusion
behaviors for these hybrids will outline key factors to optimize membrane
performance for such advanced membranes for H2S and CO2 removal
for natural gas sweetening.