共查询到16条相似文献,搜索用时 500 毫秒
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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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非均相固体碱催化剂(CaO体系)用于生物柴油的制备 总被引:18,自引:1,他引:18
为解决生物柴油酯交换过程中的产物与催化剂分离问题,制备了负载型固体碱催化剂(CaO/SiO2、CaO/Al2O3和CaO/MgO体系),考察该系列催化剂在生物柴油制备中的不同反应特点,对制备的催化剂进行XRD表征,研究了反应条件对反应的影响。结果表明,CaO可以很好地分散在催化剂载体上,该体系催化剂是制备生物柴油的良好非均相催化剂。催化剂的最佳制备条件为:焙烧温度700 ℃,催化剂质量分数为原料油的1%,m(醇)∶m(油)=18∶1,反应温度60~65 ℃,反应时间10 h。 相似文献
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用氢氧化钾作催化剂,考察了反应温度、催化剂用量、醇油摩尔比、反应时间对棕榈油和甲醇制备生物柴油产率的影响。结果表明,最佳反应条件为:反应温度40℃,催化剂用量0.6%,醇油摩尔比6∶1,反应时间2.0 h。此时,生物柴油产率可达97.82%。 相似文献
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生物柴油的生产技术 总被引:41,自引:0,他引:41
综述了生物柴油生产的原料、催化剂和生产工艺等相关研究进展。介绍了生物柴油的生产几乎可以采用所有的天然油脂作为原料,原料的来源对其性质有一定的影响。目前生物柴油工业化生产工艺主要是均相的酸、碱催化酯交换反应,很多都是在常压、低温下进行。均相酸碱催化剂的优点是反应转化率高,但是废催化剂会带来环境问题。非均相催化剂和酶催化剂则是目前研究的热点,固体碱、固定化酶等催化剂可以很容易从反应产物中分离出来。高温高压技术、超临界技术等被用于酯交换反应过程,反应可以在数分钟内完成。高速乳化技术、超声技术及微波技术等反应强化手段可以改善酯交换过程中的传质过程,有利于不完全互溶的醇油两相进行反应。 相似文献
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Akshey Marwaha Amit Dhir Sunil Kumar Mahla Saroj Kumar Mohapatra 《Catalysis Reviews》2018,60(4):594-628
The alcoholysis process requires high activity catalysts for biodiesel production. Heterogeneous catalysts have been proven to possess highly active nature and are environment-friendly. The present article emphasizes on various types of solid base catalysts that have been used in the recent past for the production of biodiesel by transesterification of oils. The parameters and conditions affecting the transesterification reaction and biodiesel yield have also been mentioned in the article. Heterogeneous catalysts have the capability to be recycled for many runs in the process without greatly abating the biodiesel yield. Also, such catalysts possess noncorrosive nature, thus making the biodiesel safe to be used in engine without any damage. The exploitation of waste materials as catalysts would reduce the overall production cost of biodiesel. Calcium-based catalysts in the reviewed literature have shown promising outcomes for the future use and would make the process economical for large-scale industrial applications. 相似文献
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Vinayak Hegde Parimal Pandit Pranita Rananaware Varsha P. Brahmkhatri 《Frontiers of Chemical Science and Engineering》2022,16(8):1198
Sulfonic acid functionalized mesoporous silica based solid acid catalysts with different morphology were designed and fabricated. The synthesized materials were characterized by various physicochemical and spectroscopic techniques like scanning electron microscope-energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller surface area, thermogravimetric analysis and n-butylamine acidity. The shape of catalysts particles plays an important role in its activity. The sulfonic acid functionalized mesoporous silica catalysts of spherical shape and the cube shape were assessed for catalytic activity in biodiesel production. The catalytic biodiesel production reaction over the catalysts were studied by esterification of free fatty acid, oleic acid with methanol. The effect of various reaction parameters such as catalyst concentration, acid/alcohol molar ratio, catalyst amount, reaction temperature and reaction time on catalytic activity were investigated to optimize the conditions for maximum conversion. It was sulfonated cubic shape mesoporous silica which exhibited better activity as compared to the spherical shape silica catalysts. Additionally, the catalyst was regenerated and reused up to three cycles without any significant loss in activity. The present catalysts exhibit superior performance in biodiesel production and it can be used for the several biodiesel feedstock’s that are rich in free fatty acids. 相似文献
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