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以柠檬醛合成酮类香料的研究进展及市场应用 总被引:1,自引:0,他引:1
《化学工程师》2021,35(1)
柠檬醛是精细化工中重要的中间体,以此为原料可合成维生素A、维生素E及多种香精香料。本文对以柠檬醛为原料合成紫罗兰酮及其它酮类香料的工艺进行了综述,对酮类衍生物的市场应用进行了介绍分析。为柠檬醛生产企业解决柠檬醛下游出路提出了建议。 相似文献
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醛类化合物的合成由来已久,其产品在香料工业中占有极重要的地位,著名的“香耐尔五号(Chanel No.5)”香水就是醛香型香水的代表作,食用香精中的头香和新鲜感大多是醛类化合物起的重要作用。近代调香发展倾向,趋向于强香韵的作品,调香中广泛采用脂肪醛类香料,如最近比较流行的花—醛香型,花—醛—青香香型等,均采用强烈的醛香表现手法突出现代香韵。许多的醛类不仅直接用于调配各种香精,同时也是合成其他香料的原料,如柠檬醛和香茅醛等广泛地用于调配食用,皂用,香水用香精,也是合成紫罗兰酮,甲基紫罗兰酮,L—薄荷脑和羟基香茅醛等重要香料的原料。 相似文献
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秦玉楠 《精细与专用化学品》1994,(9)
一、概述 利用我国丰富的山苍子资源提取的山苍子油,可制得含量98%以上的柠檬醛。用此种柠檬醛可进一步制得β-紫罗兰酮,同时副产少量的α-紫罗兰酮。 β-紫罗兰酮和α-紫罗兰酮都是纯正的高档级香精,其售价十分昂贵,现已经成为国内外香料、香精市场的紧俏品。β-紫罗兰酮又是医药工业上合成维生素A的重要原料,并且还可用作高档 相似文献
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改进β-紫罗兰酮的合成方法 总被引:2,自引:0,他引:2
以氢氧化锂/助催化剂为催化剂体系,柠檬醛为原料合成β-紫罗兰酮。此催化剂体系有良好选择性,用量少、成本低、对环境污染小。同时对反应溶剂、温度、反应时间等因素进行优化,使其适用于工业生产,最终摩尔收率可达86%以上。 相似文献
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以黏红酵母CCZU-G5为菌株,通过对菌体培养时间、辅底物葡萄糖浓度、底物柠檬醛初始用量、菌体浓度及反应时间等条件的研究,考察其对柠檬醛选择性加氢反应的影响。结果表明,当培养28 h后,菌体达到对数生长期末期,此时菌体数量及活力处于较高水平。利用此时的菌体进行加氢反应过程中,最佳反应条件为:辅底物葡萄糖浓度40 g/L,底物柠檬醛添加浓度4 g/L,菌体浓度0.4 g/mL,反应时间22 h。在此条件下,柠檬醛转化率及对香叶醇的选择性分别达88.6%与95.2%。此研究为生物合成香叶醇的工业化奠定基础。 相似文献
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紫罗兰酮的合成及应用 总被引:9,自引:0,他引:9
唐健 《化学推进剂与高分子材料》2007,5(1):43-45
概述紫罗兰酮的理化性质和香气特征,重点介绍了从山苍子精油中提取柠檬醛来合成紫罗兰酮的方法,简介紫罗兰酮在香精和医药方面的应用。 相似文献
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香料级紫罗兰酮的制备 总被引:11,自引:0,他引:11
用氢氧化钡作固体碱催化剂催化柠檬醛与丙酮缩合,以95%的收率制得假紫罗兰酮,后者在磷酸催化下环化,得α异构体含量为79%的紫罗兰酮,收率82% 相似文献
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Thomas E. Rinderer 《Journal of chemical ecology》1982,8(5):867-871
Hoarding experiments were conducted with honeybees (Apis mellifera L.) in cages containing comb treated with either 2-heptanone, isopentyl acetate, citral, or geraniol. 2-Heptanone increased hoarding rates; isopentyl acetate decreased hoarding rates; citral and geraniol had no observed effect. 相似文献
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M. Chatterjee Y. Ikushima T. Yokoyama M. Sato 《Advanced Synthesis \u0026amp; Catalysis》2008,350(4):624-632
Selective hydrogenation of citral to unsaturated alcohol [geraniol (trans) + nerol (cis)] was carried out in supercritical carbon dioxide (scCO2) using an MCM‐41 supported plantinum catalyst (∼1 wt% Pt). A remarkable rate of isomerization of the unsaturated alcohol [nerol (cis) to geraniol (trans)] during the hydrogenation of citral was achieved simply by tuning the density of CO2. Optimum reaction conditions were developed to obtain only geraniol (trans) with a selectivity of 98.8% and citral conversion of 99.8%. A significant change in the cis:trans ratio of the product (1:82.3) from the substrate (1:1.3) was observed depending on the various reaction parameters like carbon dioxide and hydrogen pressure, reactant concentration, reaction time and, particularly, the total selectivity for unsaturated alcohol [geraniol (trans) +nerol (cis)]. It has been observed that the presence of hydrogen is necessary for isomerization. Our results were explained in terms of a density‐dependent, two‐step model. The kinetic behaviour shows that the rate of isomerization was higher in scCO2 compared to other organic solvents and the pure form of geraniol (trans) was obtained exclusively. A probable reaction pathway was proposed in order to explain the isomerization during hydrogenation of citral in scCO2 medium. 相似文献
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Duraiswami Divakar Dhanagopal Manikandan Thiripuranthagan Sivakumar 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2008,83(11):1472-1478
BACKGROUND: Well‐dispersed nanoparticles of palladium were synthesized by wet impregnation technique over bentonite followed by three different reduction methods (H2 or NaBH4 or ethanol) and characterized by transmission electron microscopy, X‐ray diffraction, temperature‐programmed reduction and atomic absorption spectroscopy. Hydrogenation of citral over Pd‐supported bentonite catalysts was studied in vapor phase using a micro‐reactor. The effect of reduction method and metal loading on the conversion of citral and selectivity towards nerol and geraniol were examined. RESULTS: Among the catalysts evaluated in the vapor phase, Pd/bentonite reduced by ethanol was found to give the highest conversion and Pd/bentonite reduced by NaBH4 was found to give the highest selectivity towards nerol and geraniol. This may be attributed to the smallest particle size of Pd in the former catalyst and presence of boron species on the latter catalyst, respectively. CONCLUSION: The presence of boron in proximity to palladium particles polarized C?O bond and helped C?O adsorption, thereby yielding nerol and geraniol (the unsaturated alcohols). Copyright © 2008 Society of Chemical Industry 相似文献