...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bulletin of the Chemical Society of Japan >Accelerated Saponification of Methyl Dodecanoate with AqueousSodium Hydroxide Solution in the Presence of Alcoholsin a Silicone Rubber Tube as a Flow-Type Reactor
【24h】

Accelerated Saponification of Methyl Dodecanoate with AqueousSodium Hydroxide Solution in the Presence of Alcoholsin a Silicone Rubber Tube as a Flow-Type Reactor

机译：在硅橡胶管作为流动型反应器的醇存在下，用氢氧化钠水溶液将十二烷酸甲酯加速皂化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Saponification of methyl dodecanoate with an aqueous sodium hydroxide solution in the absence and presence ofalcohols was studied using a tubular reactor made of silicone tube to elucidate effects of alcohol addition on thesaponification. The reaction rates of saponification were accelerated significantly when alcohols were dissolved in methyldodecanoate and the rates were increased in the order: without alcohol ethanol < propanol < butanol. The rates in allcases obeyed the Nernst diffusion rate equation, and the values of apparent diffusion constant, k_a,that were determinedfrom the slope of Nernst plots were increased in the above order, indicating that diffusion of sodium ion in the aqueoussolution into the mixture of methyl dodecanoate and alcohol was much easier than that to methyl dodecanoate withoutalcohol. The values of ka increased with increase in the amount of butanol both in the tubular reactor and in a beaker(batch system). The thickness of the diffusion layer, δ, decreased with increase in the amount of butanol in thesaponification in the tubular reactor, suggesting that the increase in ka in the saponification in the presence of butanol inthe tubular reactor can be explained by decrease in values of 8.
机译：使用由硅酮管制成的管式反应器研究了在不存在和存在醇的情况下用氢氧化钠水溶液对十二烷酸甲酯的皂化作用，以阐明乙醇添加对皂化作用的影响。当将醇溶解在十二烷酸甲酯中时，皂化反应速率显着提高，并且速率依次升高：没有醇乙醇<丙醇<丁醇。在所有情况下，速率均遵循能斯特扩散速率方程式，并且从能斯特图的斜率确定的表观扩散常数k_a值按上述顺序增加，这表明钠离子在水溶液中扩散到甲基混合物中十二烷酸酯和醇比不含酒精的十二烷酸酯容易得多。在管式反应器和烧杯（分批系统）中，ka的值都随着丁醇含量的增加而增加。扩散层的厚度δ随管式反应器中皂化反应中丁醇含量的增加而减小，这表明在管式反应器中存在丁醇的情况下，皂化反应中ka值的增加可通过降低值8来解释。 。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号