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以醋酸酯类为酰化剂,由γ-丁内酯(GBL)和乙酸乙酯催化合成α-乙酰-γ-丁内酯(ABL)。探讨了各因素对ABL收率的影响,获得了最优工艺参数。其收率为84.52%,含量达89.93%。 相似文献
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用气相色谱法分析γ-丁内酯(GBL)及其与醋酸乙酯缩合制得的产物α-乙酰-γ-丁内酯(ABL)。采用10%聚己二酸乙二醇酯为固定相,202酸洗担体、N_2为载气,氢离子火焰检测器,水杨酸乙酯为内标物。GBL和ABL的平均回收率分别为101.39%和100.91%。对GBL合成ABL过程中的定量和控制取得了令人满意的结果。 相似文献
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γ-丁内酯是一种重要的有机合成原料和制药工业的中间体,本文介绍了合成方法及应用领域,并简述了作者在此领域的开发研究情况。 相似文献
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γ-丁内酯合成研究的新进展 总被引:3,自引:1,他引:3
评述了γ-丁内酯合成研究的进展,重点介绍了一些绿色环保的新工艺,如:顺酐加氢与1,4-丁二醇脱氢偶合法、糠醛加氢与1,4-丁二醇脱氢偶合法以及顺酐超临界CO2流体加氢法等,在这些新工艺中广泛采用无毒害的催化剂和溶剂。加氢和脱氢耦合法可将加氢反应的放热用于脱氢反应的供热,减小了过程的热效应,可有效避免反应器的局部过热或过冷;脱氢反应释放的氢可用于加氢反应,整个过程无氢消耗,具有能量和原子的经济性,显著地提高了整个过程的效率。顺酐超临界CO2流体加氢采用无害的溶剂替代昂贵的溶剂,且催化剂和产物易于分离。指出今后的研究方向是开发具有高效、高选择性的催化剂和新的对环境友好的合成工艺。 相似文献
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孙雪玲 《化学工业与工程技术》2008,29(1):18-20
将二乙烯三胺在碱性条件下与氯乙酸钠反应,合成了二乙烯三胺五乙酸五钠。实验考察了反应温度、反应时间以及反应终点pH值的控制对产品收率的影响,得到了合成二乙烯三胺五乙酸五钠的适宜反应条件:温度(60±5)℃,二乙烯三胺与氯乙酸钠反应时间4.5h,终点pH值控制在11.5左右。在此条件下,合成二乙烯三胺五乙酸五钠的产率约75%。 相似文献
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以二乙二醇、氯丙烯、氢氧化钠为原料,四丁基氯化铵为相转移催化剂,不引入其他溶剂,经Williamson成醚法合成了二乙二醇单烯丙基醚[2-(2-烯丙氧基乙氧基)-乙醇]。用红外吸收光谱和1H核磁共振谱对二乙二醇单烯丙基醚进行了表征。研究了反应时间、反应温度、原料摩尔比、碱用量、催化剂用量对目标产物收率的影响,得到较优的操作条件为:反应时间3h、反应温度80℃、n(二乙二醇)∶n(氢氧化钠)∶n(氯丙烯)=6∶1.2∶1、催化剂用量为氯丙烯质量的5%。在此条件下,收率达86.7%,纯度为99.2%。 相似文献
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2,6‐Bis(β‐naphthoxy)benzonitrile (BNOBN) was synthesized by reaction of β‐naphthol with 2,6‐difluorobenzonitrile in N‐methyl‐2‐pyrrolidone (NMP) in the presence of KOH and K2CO3. Poly(ether ketone ether ketone ketone)(PEKEKK) /poly(ether ether ketone ketone) (PEEKK) copolymers containing naphthalene and pendant cyano groups were obtained by electrophilic Friedel‐Crafts polycondensation of terephthaloyl chloride (TPC) with varying mole proportions of 4,4′‐diphenoxybenzophenone (DPOBP) and 2,6‐bis(β‐naphthoxy)benzonitrile (BNOBN) using 1,2‐dichloroethane (DCE) as solvent and NMP as Lewis base in the presence of anhydrous AlCl3. The resulting polymers were characterized by various analytical techniques, such as FTIR, DSC, TG, and WAXD. The results indicated that the crystallinity and melting temperature of the polymers decreased with increase in concentration of the BNOBN units in the polymer, the glass transition temperature of the polymers increased with increase in concentration of the BNOBN units in the polymer. Thermogravimetric studies showed that all the polymers were stable up to 536°C in N2 atmosphere. The copolymers have good resistance to acidity, alkali, and organic solvents. Because of the melting temperature (Tm) depression with increase in the BNOBN content in the reaction system, the processability of the resultant coplymers could be effectively improved. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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Tiantian Li Xuemei Wu Wanting Chen Xiaoming Yan Dongxing Zhen Xue Gong Jiafei Liu Shaofeng Zhang Gaohong He 《中国化学工程学报》2018,26(10):2130-2138
An imidazolium functionalized poly (ether ether ketone ketone) (PEEKK-DImOH) anion exchange membrane (AEM) readily soluble in certain low-boiling-point solvents (isopropanol) is prepared. The solubility results are consistent with the results of molecular dynamics simulations. By varying the chloromethylation reaction temperature or concentrated sulfuric acid concentration of PEEKK, the degrees of chloromethylation of PEEKK are changed from 54% to 92%, the corresponding PEEKK-DImOH AEMs with the ion exchange capacities (IECs) of 1.14-1.65 mmol·g-1. The PEEKK-DImOH 92% AEM shows high hydroxide conductivity (31 mS·cm-1), suitable water uptake (94%) and acceptable swelling ratio (39%) at 60℃. In addition, the PEEKK-DImOH AEMs possess good thermal and alkaline stability. The maximum power density (46.16 mW·cm-2) of fuel cell prepared with PEEKK-DImOH 92% AEM as exchange membrane and ionomer is much higher than that with commercial AHA membranes. All the above results indicate that the PEEKK used in this study is a promising AEM matrix material for alkaline fuel cells. 相似文献