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Received August 25, 2006
Accepted September 15, 2006
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An integrated biomass-derived syngas/dimethyl ether process
Biomass Research Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
wangtj@ms.giec.ac.cn
Korean Journal of Chemical Engineering, January 2007, 24(1), 181-185(5), 10.1007/s11814-007-5029-9
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Abstract
A Cu-Zn-Al methanol catalyst combined with HZSM-5 was used for dimethyl ether (DME) synthesis from a biomass-derived syngas containing nitrogen. The syngas was produced by air-steam gasification of pine sawdust in a bubbling fluidized bed biomass gasifier with a dry reforming reaction over ultra-stable NiO-MgO catalyst packed in a downstream reactor for stoichiometric factor (H2, CO, CO2) adjustment. It constantly gave syngas with H2/CO ratio of 1.5 and containing trace CH4 and CO2 during a period of 150 h. The obtained N2-containing biomass-derived syngas was used directly for DME synthesis. About 75% CO per-pass conversion and 66.7% DME selectivity could be achieved under the condition of 533 K, 4MPa and 1,000-4,000 h-1. The maximized DME yield, 244g DME/Kgbiomass (dry basis), was achieved under a gasification temperature of 1,073 K, ER (Equivalence Ratio) of 0.24, S/B (Steam to Biomass Ratio) of 0.72 and reforming temperature of 1,023 K with the addition of 0.54 Nm3 biogas/Kgbiomass (dry basis).
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References
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