EXTRACTION EQUILIBRIUM OF ACETIC ACID WITH QUATERNARY AMINE──Aliquat 336

QIN Wei; MA Zhijun; DAI Youyuan

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EXTRACTION EQUILIBRIUM OF ACETIC ACID WITH QUATERNARY AMINE──Aliquat 336

更新时间：2025-12-10

- EXTRACTION EQUILIBRIUM OF ACETIC ACID WITH QUATERNARY AMINE──Aliquat 336
- CIESC Journal Issue 9, (2002)
- 作者机构：
  
  清华大学化学工程系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 September 2002，
  
  Published：25 September 2002
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QIN Wei, MA Zhijun, DAI Youyuan. EXTRACTION EQUILIBRIUM OF ACETIC ACID WITH QUATERNARY AMINE──Aliquat 336[J]. CIESC Journal, 2002, (9).
DOI：

QIN Wei, MA Zhijun, DAI Youyuan. EXTRACTION EQUILIBRIUM OF ACETIC ACID WITH QUATERNARY AMINE──Aliquat 336[J]. CIESC Journal, 2002, (9). DOI：

摘要

选择Aliquat 336为萃取剂

氯仿、正辛醇和煤油为稀释剂

醋酸稀溶液为分离溶质

研究了稀释剂种类、反应剂浓度、水相 pH值、溶质在水相的浓度等因素对醋酸萃取分配系数的影响

分析了Aliquat 336萃取醋酸的机理

并在此基础上建立了描述萃取平衡的数学模型 .结果表明 :萃取结果基本符合反应剂与稀释剂的简单加和 ;稀释剂对萃取效果的影响显著

随Aliquat 336浓度的增大

氯仿和煤油为稀释剂时的萃取能力较正辛醇增加得快 ;随 pH值的变化D存在一个最大值

该值只与反应剂在有机相中的浓度有关 .Aliquat 336萃取醋酸存在阴离子交换和化学缔合两种机制

表观的阴离子交换反应平衡常数K1在有稀释剂的条件下比纯反应剂时有所增大

其中氯仿的影响相对较大

表观的化学缔合反应平衡常数K2 在有稀释剂的条件下表现为

惰性稀释剂煤油对K2 的影响不明显

氯仿具有强化的作用

而正辛醇具有削弱Aliquat 336与醋酸化学缔合的能力 .

Abstract

The extraction of acetic acid from an aqueous solution into solutions of quaternary amine

Aliquat 336

in different diluent

n-octanol

chloroform and kerosene

was investigated under various pH

concentration of Aliquat 336 and solute.The style of complex formation was discussed

and a model describing the equilibrium was proposed.The distribution coefficient

fitted the simple additive property of Aliquat 336 and the diluent.Diluent affected the D apparently; the D in chloroform and kerosene increased quicker than that in n-octanol with the Aliquat 336 concentration in organic phase.There was a maximum value for D against pH

which depended on the Aliquat 336 concentration only

and the pH value responding to the maximum D was 4.0～4.3 and 3.7～4.2 for 25% Aliquat and 50% Aliquat system

respectively.Acetic acid was bonded to Aliquat 336 by both ion exchange and chemical association

and diluent affected their parameters obviously.The apparent constant of ion exchange

K 1

increased in diluent

especially in chloroform.The apparent constant of association

K 2

increased in chloroform also

decreased in n-octanol

and kerosene affected K 2 not apparently.

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