• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Extraction of propionic acid with tri-n-octyl amine in different diluents
【24h】

Extraction of propionic acid with tri-n-octyl amine in different diluents

机译：三正辛胺在不同稀释剂中萃取丙酸

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

Tertiary amines are effective extractants for separation of carboxylic acids from dilute solutions. The basic principle of recovery by tertiary amines is through reaction with extraction. Generally amines are used in diluents to improves their physical properties and to provide solvation of the complexes formed by them with the acids. With this context, recovery of propionic acid (present in concentration range of 0.05-0.4 kmol/m~3 in the aqueous phase) by reactive extraction was studied using tri-n-octyl amine (TOA) in different diluents (n-heptane, petroleum ether, ethyl acetate and oleyl alcohol) at 305 K. Extraction using pure diluents was found to be very poor (K_D < 1; except for ethyl acetate). Using the mixtures of extractant-diluents the extraction was significantly improved (K_D increase from: 0.7 to 6.97 for oleyl alcohol; 0.0024 to 0.2783 for n-heptane; 0.0097 to 0.5929 for petroleum ether; and 2.39 to 5.249 for ethyl acetate, using 30% TOA in respective diluents). Results were presented in terms of distribution coefficient, equilibrium complexation constant, overall loading factor, stoichiometric loading factor, modified separation factor and extraction efficiency. Propionic acid-TOA was found to form (1:1) complex with no overloading in any case. TOA-oleyl alcohol system was found to provide the highest extraction.
机译：叔胺是从稀溶液中分离羧酸的有效萃取剂。叔胺回收的基本原理是通过萃取反应。通常，胺被用在稀释剂中以改善其物理性质并提供由它们形成的配合物与酸的溶剂化。在此背景下，研究了使用三正辛胺（TOA）在不同的稀释剂（正庚烷，水和乙腈）中通过反应萃取回收丙酸（在水相中浓度范围为0.05-0.4 kmol / m〜3）。石油醚，乙酸乙酯和油醇）在305K。使用纯稀释剂萃取非常差（K_D <1;除乙酸乙酯外）。使用萃取剂-稀释剂的混合物，萃取得到了显着改善（油醇的K_D从0.7提高到6.97;正庚烷的K_D从0.0024升高到0.2783;石油醚的0.009升高到0.5929;乙酸乙酯的萃取力从2.39降低到5.249，使用30％稀释剂中的TOA）。结果以分布系数，平衡络合常数，总负载因子，化学计量负载因子，改进的分离因子和萃取效率表示。发现丙酸-TOA形成（1：1）配合物，在任何情况下均无过载。发现TOA-油醇系统提供最高的提取率。

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