Reactive Extraction of Nicotinic Acid with Trialkylamine in n-Octanol

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 extra...

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Published inChinese journal of chemical engineering Vol. 20; no. 5; pp. 843 - 848
Main Author 李德亮 于飞 常志显
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2012
Subjects
Chemical engineering
Extraction
Fittings
Fourier transformation
Infrared
Mathematical analysis
N235
Nicotinic acid
proton-transfer
reactive extraction
Spectrometry
trialkylamine
三烷基胺
傅立叶变换红外光谱仪
反应萃取
正辛醇
烟酸
表观萃取平衡常数
质量作用定律
reactive extraction
trialkylamine
proton-transfer
nicotinic acid
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Summary: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.
Bibliography:LI Dehang , YU Fei and CHANG Zhixian Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
nicotinic acid, reactive extraction, trlalkylamlne, proton-transter
11-3270/TQ
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.
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(12)60408-X