共查询到17条相似文献,搜索用时 93 毫秒
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在碳达峰、碳中和的目标背景下,生物柴油被认为是替代化石燃料最有前途的新型能源之一。作为新型的加热方式,微波强化技术克服了传统加热方式下受热不均等缺点,在与不同催化体系偶联的过程中显著促进了酯交换反应的效率,较大幅度地提高了生物柴油的产率。本文归纳了微波技术强化酯交换反应制备生物柴油的优势,介绍了微波强化技术偶联均相催化、非均相催化、离子液体催化以及酶催化技术在生物柴油制备领域的研究进展,阐述了微波强化技术偶联各催化体系的利弊。从催化效率和环保等方面考虑,微波强化偶联非均相催化和酶催化具有更优的研究前景。最后,就该领域的研究方向提出几点展望与建议。 相似文献
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酯交换反应制备生物柴油催化剂的研究进展 总被引:1,自引:0,他引:1
生物柴油是一种环境友好型的可再生资源,本文介绍了生物柴油的制备技术,并综述了采用酯交换反应制备生物柴油所使用的催化剂的研究进展,简述了各种催化剂的优缺点。 相似文献
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以潲水油(WCO)为原料,探讨了酯化-酯交换两步法制备生物柴油的反应动力学。以活性炭负载硫酸铁[Fe2(SO4)3/AC]为负载型催化剂,通过测定不同反应温度、不同甲醇/脂肪酸(FFA)摩尔比条件下WCO中游离脂肪酸的转化率,以此确定酯化反应的动力学控制步骤及动力学方程中的待定参数,从而建立了在实验温度范围内酯化反应的动力学方程,并根据碱催化酯交换反应机理,在简化的动力学模型基础上,推导出了WCO中甘油三酯(TG)与甲醇发生酯交换反应的宏观动力学方程。结果表明,酯化反应和酯交换反应的动力学方程在实验条件范围内都能较好地描述各自的反应过程。 相似文献
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近几年来,微波在制备生物柴油的化学工艺中被广泛应用。而微波强化化学反应的实验研究和工程应用中存在很多限制因素,物料介电特性是其中一个重要因素。针对甲醇和菜籽油加入自制催化剂的酯交换反应体系,采用矢量网络分析仪测量不同反应条件下甲醇和菜籽油酯交换反应系统的介电系数,考察反应温度、醇油摩尔比、催化剂用量等因素对介电特性的影响规律。结合酯交换反应动力学,讨论反应温度变化对介电特性的影响,从而为微波加热酯交换反应过程的多物理仿真提供物料介电信息。 相似文献
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Ionic liquids in supercritical methanol greatly enhance transesterification reaction for high‐yield biodiesel production 下载免费PDF全文
V. M. Ortiz‐Martínez M. J. Salar‐García F. J. Hernández‐Fernández P. Olivares‐Carrillo A. P. de los Ríos J. Quesada‐Medina 《American Institute of Chemical Engineers》2016,62(11):3842-3846
Biodiesel production is one of the most promising future alternatives to replacing fossil fuels. This work studies the use of ionic liquids (ILs) as potential catalysts in supercritical methanol for biodiesel production from non‐edible oil. The transesterification reaction of karanja oil was investigated in supercritical methanol in the presence of two respective ILs, [BMIM+][ ] and [Chol+][H2 ]. The reaction was performed in a one‐step batch process at several temperatures and percentages by weight of catalyst (w/woil). The results obtained show that the IL [Chol+][H2 ] allows a high yield of fatty acid methyl esters to be achieved in a short reaction time (above 95% in 45 min). A catalytic mechanism is also proposed for the IL that offered significant catalytic activity. This work investigates the effects of the use of ionic liquids as potential catalysts in supercritical methanol for the transesterification reaction of non‐edible oil. The reported reaction times to obtain biodiesel yields above 90% through the transesterification reaction of karanja oil range between 90 min and 8 h. ILs as catalysts in supercritical methanol drastically reduce reaction time (45 min) to obtain high fatty acid methyl ester yield (95.6%). © 2016 American Institute of Chemical Engineers AIChE J, 62: 3842–3846, 2016 相似文献
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Polyethylene terephthalate (PET) was blended with two kinds of co[poly(ethylene terephthalate-p-oxybenzoate)] (POB–PET) copolyester, designated as P46 and P64, respectively. The PET and POB–PET copolyester were combined in the ratios of 85/15, 70/30, and 50/50. The blends were melt mixed in a Brabender Plasticorder at 275, 285, and 293°C for different amounts of time. The transesterification reactions during the melt mixing processes of PET with POB–PET copolyester blends were detected by proton nuclear magnetic resonance analysis. The values of the rate constants are a function of temperature and the composition of blends. The transesterification reactions that may occur during the melt mixing processes have been discussed also. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2727–2732, 1999 相似文献
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