共查询到19条相似文献,搜索用时 82 毫秒
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研究了以2,6-二叔丁基苯酚为主要原料,与甲醛反应,在-定的条件下,合成4'4'-亚甲基双(2,6-二叔丁基苯酚)的方法.考察了投料比、溶剂的浓度、催化剂等因素对反应的影响.结果表明.在以氢氧化钠为催化剂的条件下,当乙醛与2,6-二叔丁基苯酚的摩尔比约为0.55.催化剂的量为0.5g左右.乙醇水溶液的深度为75%时,反... 相似文献
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3,5-二叔丁基-4-羟基苯基丙酸甲酯是一种抗氧剂,也是合成抗氧剂1076、抗氧剂1010等的主要原料。文章研究了合成3,5-二叔丁基-4-羟基苯基丙酸甲酯的工艺条件,对传统工艺条件进行了改进。传统合成方法采用NaOCH3作催化剂,产品收率(以2,6-二叔丁基苯酚计)75%~85%;文章采用KOH作催化剂,原料配比为:2,6-二叔丁基苯酚:丙烯酸甲酯=1:1.1,110°C下滴加丙烯酸甲酯,滴加时间1.5h,升温至130℃保温反应4h,用甲醇结晶,过滤,干燥得产品。产品收率(以2,6-二叔丁基苯酚计)95%。产品为白色晶体,熔点为63~65℃,符合文献值。 相似文献
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以甲醇钠为催化剂,采用2,6-二叔丁基苯酚、三聚乙醛为原料合成4,4’-乙撑二(2,6-二叔丁基苯酚),分别考察了反应温度、反应时间、原料配比、催化剂和溶剂用量等条件对缩合反应的影响。得到了合成4,4’-乙撑二(2,6-二叔丁基苯酚)最适宜的条件是:反应温度为125℃,反应时间8 h,n(2,6-二叔丁基苯酚)∶n(三聚乙醛)为0.2∶0.15;催化剂的用量为0.8 g、溶剂的用量为40 g(2,6-二叔丁基苯酚为0.2 mol的情况下)。4,4’-乙撑二(2,6-二叔丁基苯酚)的收率可达到91.75%以上,产品纯度w[4,4’-乙撑二(2,6-二叔丁基苯酚)]超过99.0%。 相似文献
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《国际聚合物材料杂志》2012,61(1-4):121-130
Abstract The kinetic scheme of the reaction of 2,6-di-tert-butylphenol (ArOH) with methyl acrylate (MA) in the presence of potassium 2,6-di-tert-butylphenolate (ArOK) is proposed and elementary constants are calculated for the catalytic steps and the influence of proton donor components ArOH, H2O and CH3OH on kinetic regularities is studied. The kinetic scheme contains 30 components and involves 62 rate constants of elementary steps which were computed by the mathematical simulation method of process kinetics using a computer. The comparison was carried out for the computed and experimental data relating to the consumption rate dependence of ArOH on ArOK concentration and the concentration of proton donor components. 相似文献
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以对硝基甲苯为原料,经溴化、氟置换、加氢还原得4-三氟甲基苯胺,收率59.8%,纯度98.66%。然后,用硫酰氯作为氯化试剂,进行苯环上的氯化反应,制得氟虫腈关键中间体2,6-二氯-4-三氟甲基苯胺。收率83.9%,产品熔点34℃-35℃,纯度97.95%。对各步反应的影响因素进行了探讨。 相似文献
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《国际聚合物材料杂志》2012,61(3-4):335-344
Abstract Crystallization behaviour of low molecular weight (oligomeric) and high molecular weight poly(ethylene 2,6-naphthalate)s (PEN) was studied using wide angle X-ray diffraction (WAXS) and differential scanning calorimetry (DSC). It was found that the crystallization conditions determine the nature of crystalline modification. Crystallization from the glassy state gives a-modification, whereas, crystallizing from the melt above 220°C results in β-modification. In contrast, the oligomers gives both the modifications up on crystallizing from the melt. The equilibrium melting temperatures of PEN were determined from DSC experiments, based on conditions of crystallization of a and β-modifications. 相似文献
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George-Octavian Buica Eleonora-Mihaela Ungureanu Liviu Birzan Alexandru C. Razus Magdalena-Rodica Bujduveanu 《Electrochimica acta》2011,(14):5028
Electrochemical behaviour and electropolymerization of 4-azulen-1-yl-2,6-bis(2-thienyl)pyridine (L) has been studied. Complexing polymer-coated electrodes have been synthesized by oxidative electropolymerization of L in acetonitrile solutions containing 0.1 M tetrabutylammonium perchlorate. The films were characterized by cyclic voltammetry, differential pulse-voltammetry and scanning electron microscopy. The complexing properties of L and these new polymer-coated electrode materials were investigated towards heavy metals leading to complexation of lead and cadmium metal cations inside the polymer film. 相似文献
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尼泊金辛酯和异丙酯合成方法的研究 总被引:8,自引:0,他引:8
研究了各种因素对制备尼泊金辛酯,异丙酯产率的影响,筛选出最佳反应条件可使辛酯的收率达96%,异丙酯的收率达82%,用GC-MS计确定了异丙酯酯化应的副产物的结构,并提出了生成该副产物的反应机理。 相似文献
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对丙酮一步法生产甲基异丁基酮(MIBK)部分精馏流程进行了工艺分析,MIBK脱轻塔进料液中少量水的存在使MI-BK脱轻塔运行不稳定,进而影响MIBK合成液的整个分离过程。针对这个问题,提出了精馏-渗透汽化集成的工艺方案,省去MIBK脱轻塔。建立了渗透汽化小试实验,研究了NaA分子筛膜的渗透汽化过程以及分离性能。用Aspen Plus软件对精馏-渗透汽化集成工艺进行了模拟,与精馏过程相比,在MIBK产品质量与收率相同情况下,操作成本降低了20%,总成本可降低15%。 相似文献
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M. Abdallah S. A. Ahmed H. M. Altass I. A. Zaafarany M. Salem A. I. Aly 《Chemical Engineering Communications》2019,206(2):137-148
A novel compound, 2,6-bis-[1-(2-phenylhydrazono)ethyl]pyridine (BPEP), was synthesized and confirmed by NMR and IR spectroscopy. BPEP was examined as an inhibitor for the corrosion of zinc electrode in 1.0 M HCl. The inhibition efficiency of BPEP was assessed through various techniques such as hydrogen evolution, galvanostatic polarization, potentiodynamic anodic polarization, and electrochemical impedance spectroscopy. The inhibiting action of BPEP was explained in terms of the formation of a stable complex between zinc ions and BPEP and then adsorbed onto the zinc surface. The formation of the complex was established by FT-IR spectroscopy. A conductometric titration indicated that the stoichiometry of Zn+2:BPEP (metal:ligand) is 1:1. The adsorption follows the Langmuir isotherm. The Galvanostatic polarization measurements have shown that the BPEP molecule acts as a mixed-type inhibitor. The pitting potential shifted in the noble direction, indicating that the inhibition of pitting corrosion of zinc in the presence of BPEP.The activation energy and themodyanamic parameters of the adsorption process were calculated and have been explained. 相似文献