SCI和EI收录∣中国化工学会会刊

   

Reactive Extraction of Nicotinic Acid with Trialkylamine in n-Octanol

  

  • Received:2010-12-09 Revised:2012-02-22 Online:2012-07-06

Reactive Extraction of Nicotinic Acid with Trialkylamine in n-Octanol

常志显1,li deliang2,yu fei   

  1. 1. Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering
    2. Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University
  • 通讯作者: li deliang

Abstract: The distributions of nicotinic acid (NA) between water and trialkylamine (N235) dissolved in n-octanol was studied. The complexes of N235 and NA were investigated by Fourier transformation infrared spectrometry to deduce the reaction mechanism. It was found that N235/n-octanol was an efficient extractant for extracting nicotinic acid. The favorable operation conditions were equilibrium aqueous pH 4.2 to 5.5 and initial N235 concentration < 0.42 mol?L-1. The reaction processes included the reaction between neutral N235 and neutral NA and the reaction between protonated N235 and anionic NA. Based on the mass action law and some assumptions, an expression for distribution coefficient D was proposed. The apparent extraction equilibrium constants were calculated by fitting the experimental data and the results were satisfactory.

Key words: Nicotinic acid, Reactive extraction, Trialkylamine, Proton-transfer

摘要: The distributions of nicotinic acid (NA) between water and trialkylamine (N235) dissolved in n-octanol was studied. The complexes of N235 and NA were investigated by Fourier transformation infrared spectrometry to deduce the reaction mechanism. It was found that N235/n-octanol was an efficient extractant for extracting nicotinic acid. The favorable operation conditions were equilibrium aqueous pH 4.2 to 5.5 and initial N235 concentration < 0.42 mol?L-1. The reaction processes included the reaction between neutral N235 and neutral NA and the reaction between protonated N235 and anionic NA. Based on the mass action law and some assumptions, an expression for distribution coefficient D was proposed. The apparent extraction equilibrium constants were calculated by fitting the experimental data and the results were satisfactory.

关键词: nicotinic acid, reactive extraction, trialkylamine, proton-transfer

CLC Number: