Experimental study of improved two step synthesis for DME production

Experimental study of improved two step synthesis for DME production
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改进的两步合成法生产二甲醚的实验研究

DOI:
10.1016/j.fuproc.2009.05.001
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发表时间:
2010-04
期刊:
Fuel Processing Technology 0378-3820
影响因子:
--
通讯作者:
Kefa Cen
Kefa Cen
中科院分区:
其他
文献类型:
--
作者:
Yingying Zhu;Qian Liu;Shurong Wang;Zhongyang Luo;Xiaolan Ge;Kefa Cen

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二甲醚(DME)作为一种潜在的多用途燃料受到越来越多的关注。提出了一种改进的两步法合成二甲醚的新工艺路线,即在固定床反应器中合成甲醇和甲醇脱水。考察了反应压力、反应温度、合成气中H2/CO摩尔比和空速等操作条件对CO转化率、二甲醚选择性和收率的影响。CO转化率和DME产率均随压力的增加而单调增加。甲醇合成和脱水的最佳反应温度不同。当H2/CO摩尔比大于2时,CO转化率先增加后保持不变。随着空速的增加,二甲醚产率先明显增加后又逐渐降低。得到了使CO转化率和DME选择性最大的最佳反应条件。顶部和底部阶段的反应温度分别在270-280 °C和235-245 °C的范围内。最佳的H2/CO比为2以上,空速为1000-1300 h-1。
Dimethyl ether (DME) has received growing attention due to its potential use as a multi-purpose fuel. A new technical route of improved two step synthesis is proposed for DME production, which is composed of methanol synthesis and methanol dehydration in a fixed-bed reactor. The influences of the operating conditions including reaction pressure, temperature, H2/CO mole ratio in the syngas and space velocity on CO conversion, selectivity and yield of DME are investigated. CO conversion and DME yield both increase monotonically with the pressure increase. The optimal reaction temperatures for the synthesis and dehydration of methanol are different. CO conversion increases at first and keeps constant when the H2/CO mole ratio is above 2. DME yield increases obviously and then decreases gradually with the space velocity increase. The optimal conditions are obtained to maximize the CO conversion and DME selectivity. The reaction temperatures of the top and bottom stage are in the range of 270–280 °C and 235–245 °C, respectively. The optimal ratio of H2/CO is above 2, and the space velocity is in the range of 1000–1300 h−1.
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发表时间: 1999-07
影响因子: 4.7
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