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Technical Briefs

Temperature and Pressure Effects on Hydrogen Separation From Syngas

[+] Author and Article Information
Ashwani K. Gupta

Distinguished University Professor
e-mail: akgupta@umd.edu
Department of Mechanical Engineering,
University of Maryland,
College Park, MD 20742

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received March 1, 2013; final manuscript received March 8, 2013; published online April 29, 2013. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 135(3), 034502 (Apr 29, 2013) (4 pages) Paper No: JERT-13-1063; doi: 10.1115/1.4024028 History: Received March 01, 2013; Revised March 08, 2013

Multicomponent synthetic gas (syngas) mixtures produced from the gasification of coal, low grade fuel, wastes, and biomass offers a novel source of hydrogen production. Gasification also eliminates much of the pollutant emissions from the combustion these fuels. Palladium based membranes offer a promising method for extracting hydrogen from syngas. Experimental results are presented from a laboratory scale experimental facility. This facility was designed and built to examine various types of palladium and palladium alloy membranes for harvesting hydrogen from the syngas. The thin membranes (on the order of ∼12 μm) examined were supported on porous stainless-steel. A mixture of pure gasses consisting of hydrogen, nitrogen, and carbon dioxide were used to simulate syngas of different composition. The specific focus was on evaluating the role of operational temperature and pressure of membrane on the separation efficiency of hydrogen. Results are reported at temperatures from 325 °C to 400 °C and pressures from 5 to 30 psi (gauge) for various concentrations of hydrogen in the gas mixture. Results showed permeation to increase by up to 33% with a 75 °C increase in temperature. Permeation increased by over 50% with an increase in partial pressure of hydrogen by only 10 psi. These results provide clean hydrogen recovery from syngas obtained from gasification and pyrolysis of wastes and biomass.

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Figures

Grahic Jump Location
Fig. 1

Temperature effects on permeation: comparison of hydrogen permeation as a result of temperature change at three partial pressures (1:1 H2:N2)

Grahic Jump Location
Fig. 2

Pressure effects on permeation: comparison of hydrogen permeation as a result of pressure change at four temperatures (1:1 H2:N2)

Grahic Jump Location
Fig. 3

Effect of mixture composition on permeation: comparison of pressure effects on hydrogen permeation at a constant 400 °C with a hydrogen-nitrogen mixture of two different compositions (H2–N2 syngas)

Grahic Jump Location
Fig. 4

Effect of mixture composition on permeation: comparison of pressure effects on hydrogen permeation at a constant 400 °C and partial pressure of hydrogen for pure H2 and an 1:2 H2–N2 and H2–CO2 mixture (400 °C)

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