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二甲醚合成工艺技术现状 总被引:3,自引:0,他引:3
简要介绍二甲醚的性质和用途,并对几种主要的二甲醚生产合成技术作了比较,重点介绍了一步法合成二甲醚的工艺,特别介绍了煤制二甲醚的国内外现状及发展趋势,同时还介绍了合成氨联产二甲醚的工艺,并简要分析及预测了二甲醚的市场前景和发展方向。 相似文献
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An interesting integrated configuration in a thermochemical conversion biorefinery that is producing dimethyl ether (DME) is to use a small fraction of the BioDME for dewatering of the solid biomass feedstock. Therefore, the use of liquid BioDME was investigated in this study for pressurized dewatering of biomass at room temperature. Water was removed in liquid form from wet sawdust and wet wood chips using liquid DME in a laboratory-scale batch unit. Both the sawdust and the wood chips could be dewatered in a short time (minutes) to a moisture content of 15% (w/w) from an initial content of approximately 55% (w/w). Longer DME treatment times (hours) lowered the moisture content even further down to 8% (w/w), indicating that the transport phenomena in the porous biomass and the solubility of DME in water influence the dewatering characteristics. The DME dewatering performance, 12–22 g DME per g water removed, was similar to literature data on coal dewatering using liquid DME. The present study showed that DME dewatering of the solid biomass feedstock has potential as an energy-efficient dewatering process, especially in an integrated thermochemical conversion biorefinery. 相似文献
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论述了二甲醚作为二次能源替代民用燃料和车用燃料的可行性和重大意义,阐述了我国能源短缺的危害和开发二次能源的必要性和紧迫性,简述了二甲醚的性质和制备,分析了二甲醚作为二次新能源开发的资源优势和对环境的重大意义及开发前景。 相似文献
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合成气直接合成二甲醚的工艺研究 总被引:2,自引:0,他引:2
本文考察了二氧化碳浓度、空速、温度在合成气直接合成二甲醚过程中对双功能催化剂的影响,结果表明,合成比2.85,在CO2浓度4.2%-7.15%范围内,随着CO2浓度增加,CO的转化率和DME的选择性逐渐下降,在进气空速1300-3200h^-1范围内,CO的转化率和DME的选择性随空速的增加而减小,但在1500h^-1左右CO的转化率和DME的选择性较高;在反应温度265-300℃范围内,CO的转化率和DME的选择性随浊度的升高而增加,但在285-300℃之间两者变化不大,最佳条件:CO2浓度5.2%,空速1500h^-1,温度285℃。 相似文献