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Na2WO4—H2O2酸体系催化氧化1—甲氧基—2—丙醇的研究 总被引:5,自引:0,他引:5
研究了Na2WO4-H2O2体系在催化氧化1-甲氧基-2-丙醇为甲氧基丙酮反应中的催化活性,发现酸助剂及添加物对甲氧基丙酮的收率有较大的影响。酸助剂中,NaHSO4对活性的促进作用最好;而H2PO4^-和HPO4^2-对体系的活性不利。极性小分子甲醇、乙腈可促进1-甲氧其-2-丙醇的氧化,提高甲氧基丙酮的收率。同时还考察了甲醇量对甲氧基丙酮收率的影响。 相似文献
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2-乙烷氧基丙烯,特别是2-甲氧基丙烯,对合成脂溶性维生素 A、E 和 K_1的反应过程有极重要的作用。等研究了由丙二烯、乙炔和甲醇,在水里催化合成2-甲氧基丙烯的动力学,找到了连续进行反应的最佳条件。 相似文献
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将β-环糊精的2,3位引入甲氧乙基,6位引入苄基,合成新的环糊精衍生物2,3-二-O-甲氧乙基-6-O-苄基-β-环糊精,并采用静态法涂渍5g·L~(-1)新环糊精制备石英毛细管色谱柱,考察了毛细管柱的柱性能和分离性能。结果表明:该固定相对Grob试剂、苯的二取代位置异构体二氯苯、硝基甲苯和溴甲苯以及手性化合物α-乙基-2-甲氧基苯甲醇、α-乙基-3-甲氧基苯甲醇、α-甲基-对氯苯乙腈、α-苄基-对氯苯乙腈、1-(2′,4′-二氯苯氧基)-2-丙醇和2-溴丙酸甲酯都具有良好的分离效果。 相似文献
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以2-氨基-2-甲基-丙醇为脂肪酸的化学修饰试剂,气相色谱一电子轰击质谱(GC-EI MS)分析葵子油脂肪酸。2-氨基-2-甲基-丙醇将脂肪酸羧基修改为含氮杂环,使在EI源中避免了链烯基中碳碳双键的移动。解析了葵子油脂肪酸2-氨基-2-甲基-丙醇化学修饰产物的EI质谱图,讨沦了烯酸中碳碳双键的定位规则,确定了葵子油脂肪酸中碳碳双键的位置。鉴定出葵子油6种脂肪酸,不饱和脂肪酸相对含量为89.41%,其中人体必需脂肪酸9,12-十八碳二烯酸含量占65.30%。本方法为不饱和脂肪酸中双键的定位提供了新的技术手段。 相似文献
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CuO-NiO/SiO2催化氧化1-甲氧基-2-丙醇合成甲氧基丙酮 总被引:6,自引:0,他引:6
采用浸渍法制备了CuO-NiO/SiO2负载型催化剂.以空气为氧源,对CuO-NiO/SiO2催化体系催化氧化1-甲氧基-2-丙醇合成甲氧基丙酮反应的催化活性进行了考察.实验结果表明,NiO组分的负载量对催化活性影响较大;NiO和CuO两者之间有很强的协同催化效应.TPR和XRD结果表明,添加镍组分可促进铜在载体表面上分散,使氧化物还原温度降低,提高催化活性.在优化条件下,1-甲氧基-2-丙醇的转化率可达74.3%,甲氧基丙酮的收率可达63%. 相似文献
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1.本文叙述从苯-乙烯酮或对硝基苯乙烯酮开始用甲氧汞化反应合成α-溴-β-甲氧基-苯丙酮或α-溴-β-甲氧基-对硝基苯丙酮。此两种溴化物均与邻苯二甲酰亚胺钾作用生成单及双邻苯二甲酰亚胺衍生物。 2.α-邻苯二甲酰亚胺-β-甲氧基-对硝基苯丙酮以异丙醇铝还原获得DL-threo-l-对硝基苯-2-邻苯二甲酰亚胺-3-甲氧基丙醇,其构型的确定系制成其醋酸酯后与已知物比较而证明。 3.β-甲氧基-对硝基苯丙酮与溴在醋酸中作用不能取得单溴化合物而获得α,β-双溴对硝基苯丙酮。后者与邻苯二甲酰亚胺钾生成双-邻苯二甲酰衍生物。此化合物以异丙醇铝还原获得1-对硝基苯-2.3-双邻苯二甲酰亚胺丙醇。 相似文献
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The standard enthalpies of solution of benzene at 25°C in alcohols (methanol, 1-propanol, 1-pentanol, 1-decanol), aprotic solvents (1,4-dioxane, acetone, acetonitrile, dimethyl sulfoxide, dimethylformamide, propylene carbonate), and mixtures of methanol with these aprotic solvents were determined. Multiple regression analysis revealed the role of specific and nonspecific interactions in solvation of benzene in these solvents. 相似文献
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Alcohol transformation to transportation fuel-range hydrocarbon over HZSM-5 (SiO2/Al2O3 = 30) catalyst was studied at 360 °C and 300 psig. Product distributions and catalyst life were compared between methanol, ethanol, 1-propanol and 1-butanol as a feed. The catalyst life for 1-propanol and 1-butanol was more than double compared with that for methanol and ethanol. For all the alcohols studied, the product distributions (classified to paraffin, olefin, naphthene, aromatic and naphthalene compounds) varied with time on stream (TOS). At 24 h TOS, liquid product from 1-propanol and 1-butanol transformation primarily contains higher olefin compounds. The alcohol transformation process to higher hydrocarbon involves a complex set of reaction pathways such as dehydration, oligomerization, dehydrocyclization and hydrogenation. Compared with ethylene generated from methanol and ethanol, oligomerization of propylene and butylene has a lower activation energy and can readily take place on weaker acidic sites. On the other hand, dehydrocyclization of the oligomerized products of propylene and butylene to form the cyclic compounds requires the sites with stronger acid strength. Combination of the above mentioned reasons are the primary reasons for olefin rich product generated in the later stage of the time on stream and for the extended catalyst life time for 1-propanol and 1-butanol compared with methanol and ethanol conversion over HZSM-5. 相似文献
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Tunable synthesis of propylene glycol ether from methanol and propylene oxide under ambient pressure
A series of basic and acidic ionic liquids, 1-butyl-3-methylimidazolium hydroxide (BMIMOH), 1-acetyl-3-methylimidazolium chloride
(AcMIMCl) and AcMIMCl-FeCl3, or analogues of AcMIMCl, namely 1-potassium acetate-3-methylimidazolium chloride (KAcMIMCl), 1-potassium (sodium, ammonium)
acetate-3-methylimidazolium hydroxides (KAcMIMOH, NaAcMIMOH and NH4AcMIMOH), were prepared and used as catalysts for catalytic synthesis of propylene glycol ether via reaction of propylene
oxide (PO) with methanol under mild reaction conditions. KAcMIMOH exhibited outstanding catalytic performance with 94.2% of
conversion of PO and 99.1% of selectivity to 1-methoxy-2-propanol (MP-2) at 60°C and ambient pressure for 4 h. However, AcMIMCl-FeCl3 showed a good catalysis performance with high selectivity to 2-methoxy-1-propanol (MP-1). The tunable synthesis of MP-2 or
MP-1 catalyzed by basic compound KAcMIMOH or acidic ionic liquid AcMIMCl-FeCl3 was realized. 相似文献
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为了缩短有序介孔氧化硅(SBA-15)基固体碱催化剂的工艺流程,制备长程有序介孔固体碱,本文以十六烷基三甲基溴化胺(CTAB)-三嵌段表面活性剂P123为模板剂,以KF为改性剂,两步法合成有序介孔KF/Al-Ce-SBA-15(KF/ACS)固体碱催化剂,采用小角X射线衍射(小角XRD)、N2吸附-脱附曲线、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、CO2程序升温脱附(CO2-TPD)等手段,对催化剂的结构与性能进行表征,并研究了其在合成丙二醇甲醚(PM)中的催化性能。 当n(Al)/n(Ce)=0.12,KF的质量分数为10%时,KF/ACS催化剂不仅能够保持长程有序介孔结构,并且显示出强碱性能。 在催化甲醇与环氧丙烷(PO)合成PM的反应中,PM的收率达到92.0%,1-甲氧基-2-丙醇(PPM)选择性达到96.1%以上,并能有效抑制二丙二醇甲醚等副产物。 相似文献
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Jobi Kodiyan Varghese Dong Sik Park Jong Yeob Jeon Bun Yeoul Lee 《Journal of polymer science. Part A, Polymer chemistry》2013,51(22):4811-4818
Simple mixing of H3Co(CN)6 and ZnCl2 in methanol resulted in precipitates of [ZnCl]+2[HCo(CN)6]2?, constituting a new type of double metal cyanide (DMC) catalyst exhibiting a high performance in carbon dioxide (CO2)/propylene oxide (PO) copolymerization. High‐molecular‐weight poly(propylene carbonate‐co‐propylene oxide)s [poly(PC‐co‐PO)s] (Mn~40,000) were consistently obtained with high carbonate fractions (~60 mol %) and a high selectivity (>95%) with the new type of DMC catalyst. Conventional preparation of the DMC catalyst using K3Co(CN)6 and ZnCl2 required removing KCl through thorough washing and resulted in lower carbonate fractions (10–40 mol %), which depended on the washing conditions. Feeding hydrophobic diols such as 1,10‐decanediol as chain transfer agent preserved the high carbonate fraction (~60%) and enabled precise control of the molecular weight, including preparation of a low‐molecular‐weight poly(PC‐co‐PO)‐diol (Mn ~2000), which was a flowing viscous liquid with a low Tg (?30 °C) suitable for polyurethane applications. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 4811–4818 相似文献
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《Fluid Phase Equilibria》2002,201(1):187-201
Isobaric vapour–liquid equilibria have been experimentally determined for the binary systems methanol+dimethyl carbonate, ethanol+dimethyl carbonate, dimethyl carbonate+1-propanol, dimethyl carbonate+1-butanol and dimethyl carbonate+1-pentanol at 101.3 kPa. The activity coefficients were calculated to be thermodynamically consistent and were correlated with the Wilson and UNIQUAC equations. Interaction parameters related to the carbonate group (OCOO) and alcohols, in ASOG and UNIFAC methods, have been determined using our experimental VLE data. The experimental results, as well as those by other authors, agree with the calculated VLE using the new ASOG and UNIFAC parameters. 相似文献