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桐油制备生物柴油的研究 总被引:3,自引:0,他引:3
以桐油为原料,研究了高酸值原料油的预酯化工艺条件,以及酯交换反应过程中甲醇加入的方式.对桐油预酯化工艺条件的研究结果表明,在搅拌速度一定的情况下,预酯化工艺的最佳条件为醇油摩尔比7∶1、硫酸用量为1.5%(质量比)、反应温度70℃、反应时间2 h;在研究的四个因素(醇油摩尔比,催化剂浓度,反应温度,反应时间)中,反应温度对酯化反应转化率的影响最大.在酯交换反应过程中,对分批加入甲醇的初步研究结果表明,在醇油摩尔比6 ∶1、KOH浓度 1%(质量比)、反应温度60℃、反应时间1 h的条件下,分两批加入甲醇的收率比一次加入甲醇的收率提高了4%. 相似文献
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以热榨麻疯果油为原料,采用液体碱酯交换法制备生物柴油,研究了最佳的脱胶、脱酸及酯交换反应条件.试验结果表明,最佳脱胶工艺条件:温度为80℃、磷酸用量为原料油质量的0.2%、反应时间为30min、加水量为磷脂质量的3倍:最佳脱酸工艺条件:温度为85℃、超碱量为原料油质量的0.2%、搅拌速度为70r/min、反应时间为30min;最佳酯交换反应条件:甲醇:油=6:1(物质的量比)、催化剂(甲醇钠)用量为原料油质量的1.2%、反应温度为65℃、反应时间为20min,甲酯转化率可达94%以上,甲酯产品各项性能指标达到GB/T20828-2007要求. 相似文献
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生物柴油作为一种可再生的绿色能源,一出现就被赋予了替代化石燃料的使命。研发符合环境要求、活性高的催化剂及制备工艺是推动生物柴油走向产业化的重要一步。离子液体因其蒸汽压低、化学稳定性好、循环使用性好、结构可设计等优点,在近几年生物柴油的制备研究中常被作为催化剂使用。对生物柴油离子液体催化剂的研究,从单核功能化离子液体催化剂的研究开始,到双核离子液体,直至近两年出现的离子液体聚合物催的研究。随着研究的深入,离子液体催化剂的结构与其催化活性之间逐渐出现了一定的关联性,这种关联性将为进一步深入研究催化机理奠定基础。 相似文献
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Shashank Mohan Amit Pal Raj Kumar Singh R. S. Mishra 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2019,41(3):261-268
The present study deals with the development of a biodiesel production reactor based on pressurized ultrasonic cavitation technique. Transesterification of Jatropha oil takes place by passing low-frequency ultrasonic irradiation in the reaction mixture flowing at pressurized conditions in the sonochemical reactor. Reaction variables such as reaction time, molar ratio, catalyst concentration, and pressure of the reaction mixture were investigated to find the optimal parameters for biodiesel production. The energy requirement decreases with increase in pressure. Very low value of Specific Energy Consumption (0.018 kWh/kg) and significantly high value of Energy Use Index (598.83) are obtained when the pressure of reaction mixture is 15 bar. Increasing the pressure thereafter, leads to nominal gains. Ultrasonic irradiation at high-pressure condition has an additional advantage of rapid reaction and lower requirement of alcohol to oil molar ratio and catalyst concentration. Fifteen bar pressure is optimal for biodiesel production. 相似文献
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L. Y. Zhang Y. Z. Wang Z. Y. Li H. N. Huang 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2016,38(12):1713-1720
Biodiesel preparation from Jatropha oil catalyzed by KF/Red mud (KF/RM) was studied. The optimum values of parameters for preparation of Jatropha oil biodiesel were obtained. The conversion rate of transesterification reached 92.2% under the optimum conditions, and the used KF/RM could be regenerated. Catalyst characterization showed that KOH and KFeF4 were produced in KF/RM catalyst, which was crucial for the transesterification of Jatropha oil with methanol. Red mud was a good support to prepare KF-loaded catalyst, and prepared KF/RM was an excellent catalyst for biodiesel synthesis from Jatropha oil via transesterification reaction. 相似文献
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Jatropha curcas, a member of the Euphorbiaceae family, is an upcoming energy source, which promises to mitigate the energy crisis and environmental pollution. Jatropha curcas oil is looked up in terms of availability and cost and also has several applications and enormous economic benefits. The seed oils of five Jatropha curcas biotypes were screened and evaluated for their physiochemical parameters, viz. oil content (20–43%), biodiesel yield (48–66%), density (.866–.969 g/cm3), viscosity (50.12–93.79 mm3/s), iodine value (232.738–457.16 mg/g), free fatty acid (18.847–7.614 mg/g), saponification value (59.29–93.79 mg/g), flash point (125–220°C), fire point (155–260°C) and ash content (.19–.399%), which were estimated for selection of the elite Jatropha curcas biotype. The best shoot regeneration (60%) was observed in Murashige and Skoog (MS) medium supplemented with naphthalene acetic acid (0.5 ppm) and benzyl amino purine (2.0 ppm). Root induction (90%) was successfully obtained in plain MS. Acclimatisation and hardening was quite successful with survival rate of 70%. 相似文献
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According to proposed National Mission on biodiesel in India, we have undertaken studies on stability of biodiesel from tree borne non-edible oil seeds Jatropha. European biodiesel standard EN-14214 calls for determining oxidation stability at 110 °C with a minimum induction time of 6 h by the Rancimat method (EN-14112). Neat Jatropha biodiesel (JBD) exhibited oxidation stability of 3.95 h and research was conducted to investigate influence of presence of transition metals, likely to be present in the metallurgy of storage tanks and barrels, on oxidation stability of Jatropha methyl ester. It was found that influence of metal was detrimental to oxidation stability and catalytic. Even small concentrations of metal contaminants showed nearly same influence on oxidation stability as large amounts. Copper showed strongest detrimental and catalytic effect. The dependence of the oxidation stability on the type of metal showed that long-term storage tests in different types of metal containers for examining the influence of container material on oxidation stability of biodiesel may be replaced by significantly faster Rancimat test serving as an accelerated storage test. 相似文献