In this work the purification of biohydrogen was attempted in mixed gas measurements using a commercial polyimide membrane module. The impact of several process variables (gas composition, temperature, ratio of retentate and feed flows) on the real separation efficiency was statistically studied applying a 3-level full-factorial experimental design. The results showed that all the factors examined could significantly affect the achievable selectivity and it was observed that the theoretical and real separation factors were remarkably different. It was also found that - in comparison with other commercially available membranes - the module reflected potential for hydrogen enrichment. Considering the design boundaries, the highest H2/CO2 gas selectivity (1.62) could be achieved at feed pressure, separation temperature and recovery value of ∼2.2 bar, 55 C and 0.6, respectively, using a 65 vol% hydrogen/35 vol% carbon-dioxide binary mixture.
Bibliographical noteFunding Information:
This work was supported by the European Union and financed by the European Social Fund in the frame of the TAMOP-4.2.2/A-11/1/KONV-2012-0071 project and the János Bolyai Research Scholarship of the Hungarian Academy of Sciences . The authors also gratefully acknowledge the financial support by Taiwan's Bureau of Energy (grant no. 101-D0204-3 ), Taiwan's National Science Council ( NSC-99-2221-E-035-024-MY3 , NSC-99-2221-E-035-025-MY3 , NSC-99-2632-E-035-001-MY3 , NSC-101-2218-E-035-003-MY3 ), Feng Chia University ( FCU-10G27101 ).
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology