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2-甲基-3-丁烯-2-醇合成3-甲基-2-丁烯-1-醇 总被引:1,自引:0,他引:1
[目的]2-甲基-3-丁烯-2-醇是异戊二烯间接皂化法生产3-甲基-2-丁烯-1-醇过程中产生的副产物,废物回收再利用是节能减排的有效措施.[方法]2-甲基-3-丁烯-2-醇经氯化、酯化和皂化得到3-甲基-2-丁烯-1-醇.[结果]结果表明:在优化条件下,氯化反应的产率可达87.25%,酯化和皂化反应的产率可达84.53%.[结论]该方法是2-甲基-3-丁烯-2-醇再利用的有效方法. 相似文献
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2,3-二甲氧基-5-甲基-6-(3-甲基-2-烯-1-丁基)-1,4-苯酚的合成及其副产物的研究 总被引:1,自引:0,他引:1
2,3-二甲氧基-5-甲基-1,4-苯酚与2-甲基丁烯醇在BF3OEt2的催化下进行傅-克烷基化反应合成2,3-二甲氧基-5-甲基-6-(3-甲基-2-烯-1-丁基)-1,4-苯酚。对鲜见文献报道的副产物2,2,5-三甲基-3-氢-6-羟基-7,8-二甲氧基-苯并吡喃进行了结构鉴定并推测了其形成机理,在原料辅酶Q0、甲基丁烯醇和BR的配比为1:1.5:0.19(摩尔比),反应温度45℃,滴加时间30min,反应时间2h的条件下收率达90.24%。 相似文献
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以2-氨基-4-氯苯酚为原料。经乙酰化、闭环、硝化、碱解和酸化合成2-氨基-4-氯-5-硝基苯酚,精制品总收率为64%。 相似文献
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Dehua He Weiguo Huang Jinyao Liu Mingxing Zhou Qiming Zhu 《Korean Journal of Chemical Engineering》1998,15(5):556-558
Catalytic performance of various acids in the coupling reaction of formaldehyde and methyl formate to produce methyl glycolate
and methyl methoxy acetate has been studied. The influence of reaction conditions, such as catalyst amount, reaction temperature,
reaction time, and molar ratio of formaldehyde to methyl formate, has also been investigated. The results showed that the
acid strength had great influence on the reaction, namely, stronger acids had higher activities. It was also found that the
reaction temperature and time had significant effect on the reaction, and the preferable conditions were quite different as
different acids were used. 相似文献
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生物柴油低温流动改进剂复配研究 总被引:3,自引:0,他引:3
采用碱催化法制备菜籽油生物柴油和棕榈油生物柴油,对其主要品质指标进行分析;考察了添加不同的柴油低温流动改进剂及其复配物对生物柴油低温流动性能的影响。结果表明,柴油低温流动改进剂能够改善生物柴油低温流动性能;将其进行复配后,能表现出协同效应,取得更好的降滤效果,尤其能使饱和脂肪酸甲酯含量高的棕榈油生物柴油冷滤点降低8℃;不同生物柴油对柴油低温流动改进剂或其复配物感受性存在较大差异,不饱和脂肪酸甲酯含量高,且脂肪酸甲酯种类较多、分布较广的菜籽油生物柴油对单一低温流动改进剂感受性好,而饱和脂肪酸甲酯含量高,且脂肪酸甲酯种类分布较集中的棕榈油生物柴油对复配物感受性好。 相似文献
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Li Wang Jie Zhang Zhentao Mi 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2006,81(4):710-712
The ammoximation of methyl ethyl ketone and hydrogen peroxide to form methyl ethyl ketoxime was studied over zeolites (TS‐1) in the temperature range 308–373 K. The reaction was carried out in a batch autoclave at autogenous pressure. The conversion of methyl ethyl ketone and the selectivity to methyl ethyl ketoxime can reach 99% and approximately 100%, respectively, and the by‐products were the small amounts of corresponding methyl ethyl ketazine and trace amounts of unidentified compounds. Important factors were the reaction temperature, solvents and slow addition of hydrogen peroxide. The molar ratio of NH3 to ketone had no significant effect on the conversion of methyl ethyl ketone, but increase in the ratio of NH3 to ketone had a beneficial effect on selectivity. Copyright © 2006 Society of Chemical Industry 相似文献
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D. C. Posy M. A. Mohamed H. C. Coppel R. L. Jeanne 《Journal of chemical ecology》1984,10(12):1799-1807
Two active components were isolated from the ant repellent secretion produced by glandular cells on the sixth (terminal) gastral sternite ofPolistes fuscatus (F.) females. One of the components was identified as methyl palmitate. Field bioassays with synthetic methyl palmitate showed it had repellent activity againstSolenopsis geminata (F.)Forelius pruinosus (Roger), andPheidole sp. The effectiveness of the repellent was greater againstF. pruinosus andPheidole sp. than againstS. geminata. Four methyl ester homologs of methyl palmitate also were field tested for repellent activity: methyl myristate had repellent activity against all three ant species, whereas methyl stearate, methyl linoleate, and methyl linolenate exhibited no repellency. 相似文献
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Johan Samuelsson Mats Johansson 《Journal of the American Oil Chemists' Society》2001,78(12):1191-1196
Described are the physical and chemical properties of the methyl esters of two uncommon fatty acids: vernolic acid, containing
an epoxy group, and crepenynic acid, containing a triple bond. The incorporation of an epoxy or alkyne group into the fatty
acid structure is shown to greatly affect the properties compared to conventional unsaturated fatty acids. The methyl esters
have been characterized and compared with ordinary fatty acid methyl esters (i.e., methyl oleate and linoleate) with respect
to spectroscopic characterization [1H nuclear magnetic resonance (NMR)], 13C NMR, and Fourier transform infrared), rheological properties, and oxidative reactivity (using chemiluminescence). Both methyl
vernoleate and methyl crepenynate could successfully be produced by transesterification under basic conditions without reaction
of the epoxy or alkyne groups. Rheological measurements showed that the methyl esters had a significantly lower viscosity
compared to their triglyceride analogs. Smaller differences were seen when comparing the different methyl esters where methyl
vernoleate had the highest viscosity due to the presence of the more polar oxirane group. Very large differences were found
with respect to the oxidation rate of the different methyl esters. Methyl crepenynate was shown to oxidize extremely rapidly,
whereas methyl vernoleate was very stable toward oxidation. 相似文献
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为充分利用中国乌桕脂的资源优势和化学组成特点,研究并提出“两段醇解-膜式精馏-甲酯氨解”法,制得高纯度乌桕脂棕榈酸甲酯及酰胺,油酸甲酯及酰胺。 相似文献
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Ni、B共掺杂TiO2-陶粒光催化降解染料废水研究 总被引:3,自引:0,他引:3
采用溶胶一凝胶法制备陶粒负载Ni2O3和B元素共掺杂纳米TiO2可见光催化剂,以甲基橙为目标降解物,探讨了光催化氧化降解甲基橙的规律,考察了催化剂的焙烧温度、Ni元素和B元素掺杂量、催化荆投加量、甲基橙溶液初始浓度、初始pH值、反应温度等因素对甲基橙脱色效果的影响。结果表明:在600℃温度下焙烧的催化剂具有最佳光催化活性;B和Ni最佳掺杂量为3.0%;甲基橙脱色率随甲基橙初始浓度的降低、催化剂投加量的增加、反应温度的升高、初始pH值降低而增大;催化剂经重复使用后,仍具有较高的光催化性能。 相似文献
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利用硫化钠与钼酸钠为原料,通过盐酸酸化,在TiO2上沉积MoS2纳米片。利用甲基红为降解对象,研究合成的片状纳米MoS2/TiO2复合物的光催化性能。结果显示该复合物具有优良的光催化降解甲基红的性能;催化剂用量、甲基红初始浓度与初始pH等条件对甲基红降解存在明显影响。该催化剂在重复使用3次时,甲基红2 h的脱色率接近65%,表明催化剂具有较好的重复使用性能。 相似文献