共查询到18条相似文献,搜索用时 78 毫秒
1.
2.
3.
4.
5.
6.
微波-固体酸催化棉籽油制备生物柴油的研究 总被引:2,自引:0,他引:2
探讨了微波辅助条件下采用新型固体酸S2082-/Al2O3-ZrO2-La2O3替代传统的液体酸、碱催化剂,催化棉籽油与甲醇进行酯交换反应制备生物柴油。考察了微波功率、固体酸催化剂用量、醇油摩尔比、反应温度等因素对产物中甲酯含量的影响。结果表明,在微波辅助下,固体酸催化剂对棉籽油酯交换具有较好的催化活性和稳定性,产物与催化剂易于分离。在微波功率300W,反应温度120℃,醇油摩尔比12:1,固体酸催化剂用量为油质量的3%条件下,反应1.5h产物中棉籽油甲酯含量达到95.2%,催化剂重复使用10次甲酯含量维持在90%左右,表明催化剂具有较高的催化活性和稳定性。 相似文献
7.
8.
9.
建立了气相色谱法测定固体碱硅酸钠制备的生物柴油中多种脂肪酸甲酯的方法,确立了最佳分析条件。采用PEG-20M弹性石英毛细管色谱柱,FID检测器,以邻苯二甲酸二乙酯为内标,恒温测定生物柴油中棕榈酸甲酯、硬脂酸甲酯、油酸甲酯和亚油酸甲酯的含量。结果表明.棕榈酸甲酯、硬脂酸甲酯、油酸甲酯和亚油酸甲酯分别在0.75~15mg/mL、0.75~15mg/mL、0.9~18mg/mL、1.3~26mg/mL浓度范围内呈良好的线性关系(R〉0.9909),回收率为96.01%~102.51%(n=5),精密度试验RSD=I.34%~2.51%。该方法准确可靠、快速简便、重现性好。 相似文献
10.
固体碱催化制备生物柴油的气相色谱分析法 总被引:1,自引:0,他引:1
建立了气相色谱法测定固体碱硅酸钠制备的生物柴油中多种脂肪酸甲酯的方法,确立了最佳分析条件。采用PEG-20M弹性石英毛细管色谱柱,FID检测器,以邻苯二甲酸二乙酯为内标,恒温测定生物柴油中棕榈酸甲酯、硬脂酸甲酯、油酸甲酯和亚油酸甲酯的含量。结果表明.棕榈酸甲酯、硬脂酸甲酯、油酸甲酯和亚油酸甲酯分别在0.75~15mg/mL、0.75~15mg/mL、0.9~18mg/mL、1.3~26mg/mL浓度范围内呈良好的线性关系(R〉0.9909),回收率为96.01%~102.51%(n=5),精密度试验RSD=I.34%~2.51%。该方法准确可靠、快速简便、重现性好。 相似文献
11.
12.
制备了5种杂多酸离子液体催化剂[TEA-PS]_XH3-XPW12O40(X=1,1.5,2,2.5,3),用于催化棉籽油酯交换制备生物柴油研究,其中杂多酸离子液体[TEA-PS]1.5H1.5PW12O40的催化活性最高。以杂多酸离子液体[TEA-PS]1.5H1.5PW12O40为催化剂,研究了甲醇与棉籽油摩尔比、催化剂[TEA-PS]1.5H1.5PW12O40用量、反应温度和反应时间对甲醇与棉籽油酯交换反应的影响。结果表明:当甲醇与棉籽油摩尔比为12∶1、催化剂[TEA-PS]1.5H1.5PW12O40用量为棉籽油质量的5%、反应温度80℃、反应时间6 h时,生物柴油收率最高,达95.3%;同时,催化剂[TEA-PS]1.5H1.5PW12O40重复使用6次后,生物柴油收率仍高于92%。 相似文献
13.
研究生物酶催化废白土油与甲醇酯交换制备生物柴油的最佳工艺条件。通过对比相当用量的Lipozyme TL IM和Novozyme 435的催化效果,筛选出Lipozyme TL IM为适宜的酶;在此基础上,以醇油摩尔比、生物酶添加量、反应温度、反应时间为自变量,生物柴油得率为响应值,进行酯交换制备生物柴油的响应面优化实验。结果表明,酯交换反应最佳条件为:醇油摩尔比4∶1,Lipozyme TL IM添加量10%(以废白土油质量计),反应温度35℃,反应时间15 h;在此条件下,生物柴油得率为95.9%,所得生物柴油非常接近0#柴油的质量标准。 相似文献
14.
15.
16.
17.
以过氧化值为评价指标,采用Schaal烘箱法研究了几种不同抗氧化剂及增效剂对核桃油的抗氧化效果。结果表明:单一抗氧化剂TBHQ的抗氧化效果最好,在60℃烘箱中核桃油保质期为96 h;复合抗氧化剂试验组的过氧化值均低于空白对照的,其中TBHQ和BHT复合使用抗氧化效果较好,在60℃烘箱中核桃油保质期为192 h;柠檬酸和抗坏血酸均能显著提高复合抗氧化剂TBHQ和BHT的抗氧化作用,添加0. 010%柠檬酸的核桃油保质期为312 h,添加0. 010%和0. 012%抗坏血酸的核桃油保质期为288 h;响应面分析试验筛选出抗氧化效果最优组合为0. 017%复合抗氧化剂(TBHQ与BHT质量比1∶1)+0. 012%柠檬酸+0. 010%抗坏血酸,在20℃下核桃油的理论货架期可延长至288 d。 相似文献
18.
Abdul Md Alim Jeung Hee Lee Ki‐Teak Lee 《Journal of the science of food and agriculture》2009,89(4):706-712
BACKGROUND: Solid fat was produced from mustard oil and palm stearin through lipase‐catalyzed reaction, in which linoleic acid was intentionally incorporated. For optimizing the reaction condition of melting point and ω6/ω3 fatty acids, response surface methodology (RSM) was employed with three reaction variables such as substrate mole ratio of mustard oil (MO) to palm stearin (PS) (X1), reaction temperature (X2) and reaction time (X3). RESULTS: The predictive model for melting point of solid fat was adequate and reproducible due to no significant lack of fit (P = 0.0764), P‐value (0.0037) of the model, and satisfactory level of coefficient of determination (R2 = 0.92). For the ω6/ω3 ratio model, R2 and P‐value were 0.89 and 0.0132, respectively, but lack of fit was significant (P = 0.0389). The melting point of the produced solid fat was affected by substrate mole ratio, whereas reaction temperature and time had no significant effect. The ω6/ω3 ratio of solid fat was influenced by substrate mole ratio and reaction temperature but not by reaction time. Based on ridge analysis, lower ω6/ω3 ratio was predicted by decreasing substrate mole ratio and reaction time, and by increasing reaction temperature. CONCLUSIONS: For producing solid fat with a specific melting point of 34.57 °C, a combination of 1:2 (X1), 65.17 °C (X2) and 21.46 h (X3) was optimized, and the optimization was confirmed under the same reaction conditions. The solid fat contained palmitic (37.8%), linoleic (24.8%), oleic (21.3%), and erucic acid (9.7%), and its solid fat content was 30.3% and 10.3% at 20 and 30 °C, respectively. Copyright © 2009 Society of Chemical Industry 相似文献