Abstract
Mixtures of hydrogen-methane (hydromethane), composed of 20–30 %vol. hydrogen, are considerably interesting, especially in the field of sustainable mobility, because their energy content is higher than that of pure methane; moreover, the carbon dioxide emissions due to the combustion are reduced. The production of such mixture can be effectively carried out by means of steam reforming of natural gas (97 % methane and 3 % carbon dioxide) at 500–550 °C. However, the reformed gas must be purified in order to reduce the carbon dioxide concentration (lower than 3 %). The pressure swing adsorption technology, which uses activated carbon as adsorbent material, may be employed to remove carbon dioxide and to obtain a high recovery of hydrogen and methane. To improve the recovery of methane, a second pressure swing adsorption unit, which uses carbon molecular sieve as an adsorbent, can be introduced.
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Abbreviations
- A :
-
Skarstrom PSA cycle
- B :
-
Modified Skarstrom PSA cycle
- b :
-
Temperature-dependent Langmuir isotherm parameter
- k :
-
Mass transport coefficient
- p :
-
Partial pressure
- P :
-
Total pressure
- q :
-
Amount absorbed on absorbent material
- q max :
-
Maximum absorbable amount
- S :
-
Selectivity
- T :
-
Temperature
- i, J :
-
component
- kin:
-
Kinetic
- LDF:
-
Linear driving force
- thermo:
-
Thermodynamic
- BD:
-
Blow-down step
- CHP:
-
Cogeneration system
- CMS:
-
Carbon molecular sieve
- EQ:
-
Equalization step
- FE:
-
Feed step
- MOF:
-
Metal organic framework
- PR:
-
Pressurization step
- PSA:
-
Pressure swing adsorption
- PU:
-
Purge step
- RPSA:
-
Rapid pressure swing adsorption
- SAPO:
-
Silico aluminate phosphate
- VPSA:
-
Vacuum pressure swing adsorption
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© 2016 Springer International Publishing Switzerland
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Augelletti, R., Frattari, S., Murmura, M.A. (2016). Purification of Hydrogen-Methane Mixtures Using PSA Technology. In: De Falco, M., Basile, A. (eds) Enriched Methane. Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-22192-2_8
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DOI: https://doi.org/10.1007/978-3-319-22192-2_8
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