共查询到19条相似文献,搜索用时 515 毫秒
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生物柴油生产中酯交换反应的研究进展 总被引:1,自引:0,他引:1
酯交换反应是酯交换法生产生物柴油的关键步骤,综述了酸、碱、酶等催化条件下和超临界条件下酯交换反应制备生物柴油的研究进展,重点介绍了一些有工业前景的过程。 相似文献
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酯交换法生产生物柴油技术研究进展 总被引:2,自引:0,他引:2
生物柴油是对环境友好的绿色可再生能源。论述了酸碱催化法、酶催化法和非催化法酯交换工艺制备生物柴油的研究进展,并指出了今后的研究方向。 相似文献
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非均相连续化工艺是生物柴油规模化工业生产的发展方向。多相催化剂的研制和新型工艺过程的开发一直是生物柴油领域的研究热点,也是实现生物柴油绿色、经济、高效生产的关键。分析了酯交换反应可能的反应机理,综述了国内外生物柴油非均相酸碱催化剂的最新研究进展,评述了多种固体酸碱催化剂在生物柴油的制备中优异的催化性能和存在的问题,介绍了多种新型多相生物柴油反应器及反应分离耦合工艺在生物柴油连续化制备中的应用,最后展望了生物柴油未来的发展前景,指出新型固体酸碱双功能催化剂与先进多相连续反应分离耦合工艺的开发将推动生物柴油领域不断发展。 相似文献
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新型催化剂制备生物柴油的动力学 总被引:1,自引:0,他引:1
工业生产中常采用碱催化酯交换法制备生物柴油,但原料油中的游离脂肪酸和水分往往会导致产生较多的皂化物,影响生物柴油和甘油的分离,降低了生物柴油的产率。开发的新型生物柴油催化剂SXL较好地解决了上述问题。以精制菜籽油和甲醇为原料,采用液相色谱法跟踪分析生物柴油(脂肪酸甲酯)的质量分数,考察新型催化剂SXL作用下的酯交换反应动力学,并研究该酯交换反应的影响因素,得到相关动力学参数。研究结果表明:在40—60℃,反应速率随反应温度升高而增大;催化剂与菜籽油质量比为2.2%时反应速率较快,产率较高;醇油摩尔比为16∶1时,在较短时间内可达到较高产率;通过假设求证得到催化剂SXL作用下的酯交换反应整个过程是从二级反应向零级反应转变,反应的平均活化能为35.33 kJ/mol,频率因子k0为4.73×105 L/(mol.min)。 相似文献
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Heterogeneous Catalyst of Mixed K Compounds/Ca‐Al‐Graphite Oxide for the Transesterification of Soybean Oil to Biodiesel 下载免费PDF全文
A novel heterogeneous solid base catalyst was prepared by loading of Ca‐Al‐graphite oxide with mixed potassium salts and applied in the transesterification of soybean oil with methanol to produce biodiesel. The catalysts were characterized by Hammett indicators, X‐ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X‐ray spectrometry, and transmission electron microscopy. The effects of the methanol‐to‐oil molar ratio, catalyst amount, reaction temperature, stirring rate, and reaction time were investigated to optimize the transesterification reaction conditions. Moreover, the prepared catalyst retains its activity after being used for four cycles. In particular, the solid base catalyst can be effectively and easily separated from the reaction system, which may provide significant benefits for the development of an environmentally benign and continuous process for preparing biodiesel. 相似文献
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以酸化油为原料,利用气升式反应器二步法生产生物柴油.通过实验优化出预酯化反应和酯交换反应的最佳工艺条件和气升式反应装置的最佳工艺参数.气升式反应器的最佳工艺操作参数为:预酯化反应,反应温度115℃,反应时间2 h,催化剂质量分数1%,甲醇通入速度6.5 L/h;酯交换反应,反应温度70℃,反应时间1 h,催化剂质量分数... 相似文献
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《Catalysis communications》2007,8(7):1107-1111
In this study, transesterification of soybean oil to biodiesel using SrO as a solid base catalyst was studied. The reaction mechanism was proposed and the separate effects of reaction temperature, molar ratio of methanol to oil, mass ratio of catalyst to oil and repeated experiments were investigated. The results showed that the yield of biodiesel produced with SrO as a catalyst was in excess of 95% at temperatures below 70 °C within 30 min. SrO had a long catalyst lifetime and could maintain sustained activity even after being repeatedly used for 10 cycles. The results proved that transesterification of soybean oil to biodiesel using SrO as a catalyst is a commercially viable way to decrease the costs of biodiesel production. 相似文献
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Natesan Kapilan T. P. Ashok Babu Rana Pratap Reddy 《European Journal of Lipid Science and Technology》2010,112(2):180-187
Biodiesel derived from non‐edible Madhuca Indica oil (MIO) seems to be a better alternative to diesel oil in India. In the present work, effects of reaction variables such as mass ratio of methanol to oil, catalyst concentration, reaction time and reaction temperature on biodiesel yield were studied. The acid value of the commercially available MIO is high, and hence a two‐step process was used to produce biodiesel from MIO. In the first step, the acid value of the MIO was reduced to less than 1 mg KOH/g, using acid‐catalyzed transesterification. In the second step, the pretreated MIO was converted to biodiesel using alkaline‐catalyzed transesterification. From the experimental results, it is observed that the optimized conditions for biodiesel production are a 1 : 4 mass ratio of methanol to oil, 55 °C reaction temperature, 120 min of reaction time, and 1% sodium hydroxide catalyst. The properties of the MIO biodiesel were found to be within the biodiesel limits of the European Union. Hence, the MIO biodiesel can be used as a substitute for diesel for the sustainable development of rural areas and as a renewable fuel. 相似文献
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用氢氧化钙和氢氧化钠联合改性活性白土制备了膨润土固体碱催化剂,并用于麻疯树油和甲醇酯交换反应合成生物柴油。主要目的是研究酯交换反应的动力学及纯化反应获得的粗生物柴油使其达到相关国际标准。首先在消除内外扩散的条件下,测定323.15~338.15 K温度范围内的反应动力学数据,并用拟均相模型进行拟合。在室温下使用膨润土为吸附剂对粗生物柴油进行纯化,以移除游离甘油为目标,考察吸附剂用量和吸附时间的影响,以获得适宜纯化条件。结果表明,膨润土固体碱催化剂有较高的活性和稳定性,所得生物柴油粗产品质量较好;反应过程符合拟一级反应动力学机理,活化能67.87 kJ·mol-1;在3%(质量分数)的膨润土用量,室温吸附30 min的条件下,纯化后的生物柴油符合欧洲标准(EN 14214)且产品收率超过96%。 相似文献