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脂肪酶催化食用废油制备生物柴油 总被引:1,自引:0,他引:1
利用脂肪酶为催化剂,食用废油与甲醇反应,制备生物柴油,最佳酯化反应条件为反应温度50℃、脂肪酶催化剂用量为原料量的3%、甲醇与食用废油体积比为3∶1、共溶剂丁酮量为甲醇量的1/6、pH=7,反应时间4h,生物柴油产率可达到78%,对产品的各项指标测定,均达到GB/T20828-2007要求,指标并与0#石化柴油相接近。 相似文献
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Callistus Nonso Ude Dominic Okechukwu Onukwuli Jonah Chukwudi Umeuzuegbu Chinemelum Chukwujekwu Chukwuka 《化学工程与技术》2021,44(1):65-76
The heterogeneous catalysis of transesterification of gmelina seed oil to biodiesel is evaluated. The oil was extracted from the seeds with n‐hexane by solvent extraction and characterized to determine its physiochemical properties. Response surface methodology was applied to optimize the effect of process variables on the biodiesel yield. The base‐activated clay catalyst performed as montmorillonite clay with the characteristic property of a Brønsted acid. It has an improved surface area after activation that enhanced its catalytic activity on transesterification reaction. Under optimal conditions, the biodiesel yield was 70.1 %, thus demonstrating that the model predicted well the biodiesel production. 相似文献
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生物酶法生产生物柴油具有化学催化法不可比拟的优越性,是工业化生产的发展方向。介绍了固定化脂肪酶在催化油脂酯交换制备生物柴油方面的应用,对影响酯交换反应的脂肪酶源、底物摩尔比率、酰基受体、水含量、反应温度、副产物等因素进行了综述。 相似文献
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棉籽油酯交换制备生物柴油固体碱催化过程研究 总被引:23,自引:0,他引:23
生物柴油(脂肪酸甲酯)可以由棉籽油与甲醇在碱催化剂的作用下通过酯交换反应制得.本实验通过高温煅烧氢氧化镁、碳酸钙及镁-铝水滑石得到了相应的固体碱催化剂MgO、CaO及MgO-Al2O3,并对催化剂活性进行评价.实验结果表明,CaO及MgO-Al2O3具有较高的酯交换反应活性:在230℃,醇油摩尔比12:1及催化剂用量为棉籽油2%(wt)的条件下,反应3 h后,甲酯的收率达到90%以上.CO2-TPD实验结果表明,CaO 及MgO-Al2O3具有较强和较多的碱性位,而催化剂的活性与碱强度及碱性位数量直接相关. 相似文献
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Chi-Yang Yu Liang-Yu Huang I-Ching Kuan Shiow-Ling Lee 《International journal of molecular sciences》2013,14(12):24074-24086
Biodiesel, a non-toxic and biodegradable fuel, has recently become a major source of renewable alternative fuels. Utilization of lipase as a biocatalyst to produce biodiesel has advantages over common alkaline catalysts such as mild reaction conditions, easy product separation, and use of waste cooking oil as raw material. In this study, Pseudomonas cepacia lipase immobilized onto magnetic nanoparticles (MNP) was used for biodiesel production from waste cooking oil. The optimal dosage of lipase-bound MNP was 40% (w/w of oil) and there was little difference between stepwise addition of methanol at 12 h- and 24 h-intervals. Reaction temperature, substrate molar ratio (methanol/oil), and water content (w/w of oil) were optimized using response surface methodology (RSM). The optimal reaction conditions were 44.2 °C, substrate molar ratio of 5.2, and water content of 12.5%. The predicted and experimental molar conversions of fatty acid methyl esters (FAME) were 80% and 79%, respectively. 相似文献
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固体酸催化棉籽油酯交换制备生物柴油 总被引:42,自引:0,他引:42
生物柴油(脂肪酸甲酯)可以由棉籽油与甲醇在酸催化剂的作用下通过酯交换反应制得. 通过硫酸改性氧化钛、氧化锆,并经过高温煅烧得到了相应的固体强酸催化剂TiO2-SO42-, ZrO2-SO42-,并对催化剂活性进行了评价. 实验结果表明,TiO2-SO42-和ZrO2-SO42-与改性前的氧化物相比具有较高的酯交换反应活性. 在230℃、醇油摩尔比12:1及催化剂用量为棉籽油2%(w)的条件下,反应8 h后甲酯的收率达到90%以上. 与固体碱催化剂相比,固体酸催化剂对原料的酸度有更强的适应性. 红外吡啶吸附光谱表明,TiO2-SO42-与ZrO2-SO42-具有较强的L酸和B酸中心. 相似文献
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Amanda D’Cruz Mangesh G. Kulkarni Lekha Charan Meher Ajay K. Dalai 《Journal of the American Oil Chemists' Society》2007,84(10):937-943
A series of alkali metal (Li, Na, K) promoted alkali earth oxides (CaO, BaO, MgO), as well as K2CO3 supported on alumina (Al2O3), were prepared and used as catalysts for transesterification of canola oil with methanol. Four catalysts such as K2CO3/Al2O3 and alkali metal (Li, Na, K) promoted BaO were effective for transesterification with >85 wt% of methyl esters. ICP-MS analysis
revealed that leaching of barium in ester phase was too high (~1,000 ppm) when BaO based catalysts were used. As barium is
highly toxic, these catalysts were not used further for transesterification of canola oil. Optimization of reaction conditions
such as molar ratio of alcohol to oil (6:1–12:1), reaction temperature (40–60 °C) and catalyst loading (1–3 wt%) was performed
for most efficient and environmentally friendly K2CO3/Al2O3 catalyst to maximize ester yield using response surface methodology (RSM). The RSM suggested that a molar ratio of alcohol
to oil 11.48:1, a reaction temperature of 60 °C, and catalyst loading 3.16 wt% were optimum for the production of ester from
canola oil. The predicted value of ester yield was 96.3 wt% in 2 h, which was in agreement with the experimental results within
1.28%. 相似文献
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固体碱催化黄连木籽油制备生物柴油 总被引:1,自引:1,他引:1
制备了K2CO3/Mg(A l)O固体碱催化剂,适宜制备条件为:K2CO3负载量30%、在700℃下焙烧4 h。用比表面积测定仪、X射线衍射仪、红外光谱仪对其进行了表征。以黄连木籽油为原料,开展了酯交换法制备生物柴油的研究,考察了主要影响因素:醇油摩尔比、催化剂用量、反应时间和反应温度对酯交换反应的影响,得到的酯交换反应适宜条件为:以黄连木籽油0.01 mol计,醇油摩尔比12∶1、催化剂用量为黄连木籽油质量的4.0%、反应时间2.5 h、反应温度68℃。在该条件下生物柴油的收率可达99%以上。催化剂经4次循环使用,生物柴油收率仍可保持在96%以上。用FTIR1、HNMR对所制备的产品进行了表征,证明产品中含有饱和脂肪酸甲酯和不饱和脂肪酸甲酯。 相似文献
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对取自餐饮的潲水油进行一系列预处理,脱去其中的胶类、色素、水分等杂质,然后用自制的固体酸、固体碱催化剂经"两步法"工艺将其转化为生物柴油。结果发现,在预酯化反应中,催化剂A用量为6%、醇油摩尔比为12∶1,反应2.5 h后,潲水油的酸值由50 mg KOH.g-1降至2 mg KOH.g-1。通过正交实验得到碱催化酯交换反应最佳条件为:反应时间2 h、反应温度100℃、催化剂B用量6%、醇油摩尔比9∶1,在此条件下转化率达96.4%。表明所制备的固体酸、固体碱催化剂能有效将潲水油转化为生物柴油。 相似文献
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Pinto Francisco G. H. S. Fernandes Francisco R. Caldeira Vinicius P. S. de Castro Heizir F. Di Souza Luiz Santos Anne G. D. 《Catalysis Letters》2021,151(8):2187-2196
Catalysis Letters - Microbial lipase from Burkholderia cepacia was immobilized by covalent bond and physical adsorption on SBA-15 mesoporous support and its catalytic efficiency was measured in the... 相似文献
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abstract The structured lipids are produced through sn-1,3-specific interesterification of soybean oil with medium-chain triacylglycerol (MCT) in continuous reactions catalyzed by Thermomyces lanuginos... 相似文献