Scale study of direct synthesis of dimethyl ether from biomass synthesis gas |
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Authors: | Yongxing Lv Tiejun Wang Chuangzhi Wu Longlong Ma Yi Zhou |
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Institution: | aKey Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China |
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Abstract: | We investigated the synthesis of dimethyl ether (DME) from biomass synthesis gas using a kind of hybrid catalyst consisting of methanol and HZSM-5 zeolite in a fixed-bed reactor in a 100 ton/year pilot plant. The biomass synthesis gas was produced by oxygen-rich gasification of corn core in a two-stage fixed bed. The results showed that CO conversions reached 82.00% and 73.55%, the selectivities for DME were 73.95% and 69.73%, and the space–time yields were 124.28 kg m− 3 h− 1 and 203.80 kg m− 3 h− 1 when gas hourly space velocities were 650 h− 1 and 1200 h− 1, respectively. Deoxidation and tar removal from biomass synthesis gas was critical to the stable operation of the DME synthesis system. Using single-pass synthesis, the H2/CO ratio improved from 0.98–1.17 to 2.12–2.22. The yield of DME would be increased greatly if the exhaust was reused after removal of the CO2. |
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Keywords: | 100 ton/year scale Biomass Synthesis gas DME |
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