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排序方式: 共有82条查询结果,搜索用时 24 毫秒
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Jesús F. Ontiveros Bing Hong Kenji Aramaki Christel Pierlot Jean-Marie Aubry Véronique Nardello-Rataj 《Journal of surfactants and detergents》2021,24(3):401-410
A series of symmetrical dialkyl methanesulfonate amphiphiles [DiC n CHSO 3 ] m M (n = 6, 7, 8) with different counter cations (Mm+ = H+, Li+, Na+, K+, Cu2+, Zn2+, Mg2+, Ca2+, Sc3+) were synthesized in five steps. Their solubility and critical micelle concentration (CMC) in water were determined highlighting a huge effect of the chain length and the nature of the cation. The hydrophilic–lipophilic balance of the surfactants were assessed with the phase inversion temperature (PIT)-slope method based on the deviation from the PIT of the reference C10E4/n-octane/0.01 M NaCl(aq) emulsion through addition of increasing amounts of the dialkyl methanesulfonates. The hydrophilicity of the surfactants was thus ranked in terms of dPIT/dxsulfonate. A “cation” scan with the [DiC 6 CHSO 3 ] m M /benzene/water systems at fw = 0.5 was finally performed confirming the hydrophilicity ranking obtained with the PIT-slope method. It revealed that the [DiC 6 CHSO 3 ] 2 Mg behaves as a “Balanced Surfactant” able to form spontaneously a three-phase microemulsion system (Winsor III) just in the presence of water and oil, in the same way as the catalytic surfactant dimethyldioctylammonium molybdate, which has the same PIT-slope. 相似文献
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本文介绍了一步法制备取代2-四氢萘酮的新方法,与常规合成方法相比,该法具有明显的优点:不需要先将羧酸转化成酰氯,避免了三氯化铝以及含氯溶剂的应用,并使催化剂得以循环利用。因此,该方法安全、环保,有望取代常规的付-克反应在工业上的应用。 相似文献
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高纯度甲基磺酸亚锡生产新工艺 总被引:3,自引:0,他引:3
研究了用锡和甲基磺酸反应直接生产电镀用的纯甲基磺酸亚锡的新工艺,其产品纯度达到99.5%以上,并研究了提高设备利用率和生产效率的措施,设备利用率可提高2.28倍,建成的150t/a甲基磺酸亚锡生产装置,其产品产量、质量均达到了预期效果。该工艺无毒无害无三废排放。 相似文献
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研究了甲基磺酸盐体系电镀Pb–Sn–Cu三元合金工艺参数对镀层成分和外观的影响,确定了最佳的工艺条件:Pb2+95~105g/L,Sn2+9~13g/L,Cu2+2~3g/L,甲基磺酸140g/L,添加剂A3~5g/L,添加剂B6~7g/L,电流密度2.5A/dm2,温度19~23°C。在此工艺下以不锈钢片为基材镀Pb–Sn–Cu合金45min,所得镀层色泽均匀,结晶细致,膜层厚度为11.2μm,镀层中Sn含量为7.44%~7.52%,Cu含量为2.19%~2.26%,符合Pb–Sn–Cu三元合金镀层成分的要求。 相似文献
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The anodic behavior of gold has been investigated in presence of chloride and/or water in 1-butyl-3-methylimidazolium methanesulfonate (BMI CH3SO3) ionic liquid (IL). The cyclic voltammetry (CVs) in presence of chloride ions shows two waves attributed to the oxidation of the gold electrode which occurs under two steps: the first one is attributed to the electrochemical dissolution of gold into to gold(I), while the second one is attributed to an overlap of the chloride oxidation step as well as the oxidation of Au(I) to Au(III). Furthermore the determination of water and chloride content in IL allowed observing that the passive layer induced by water could be removed under chloride. Thanks to those results we were able to clarify the conditions of gold recovering in this kind of electrolyte. 相似文献
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甲烷磺酸铝催化合成氯乙酸酯的性能研究 总被引:2,自引:0,他引:2
合成了甲烷磺酸铝,用热重和红外对其进行表征。并以甲烷磺酸铝为催化剂,研究其催化氯乙酸与异丙醇酯化反应中各种因素对酯化率的影响。反应条件为:醇酸摩尔比1.2∶1,催化剂摩尔分数1.0%(以酸的摩尔数计),反应时间2.5h,反应温度80~85℃,环己烷5mL作为带水剂,酯化率可达96.8%,反应后催化剂经过简单的相分离就可重复使用。与AlCl3·6H2O、Al2(SO4)3·18H2O及其它Lewis酸进行比较,甲烷磺酸铝的催化活性最好。用甲烷磺酸铝作催化剂合成其它氯乙酸酯,酯化率均在96.0%以上。 相似文献