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Trialkylamine picolinate complex extraction equilibrium studies

Author: YuFei
Tutor: LiDeLiang
School: Henan University
Course: Environmental Science
Keywords: Complex extraction Collaborative - complexation extraction Picolinic acid (2 - pyridine carboxylic acid , nicotinic acid, isonicotinic acid )
CLC: O626.321
Type: Master's thesis
Year: 2011
Downloads: 41
Quote: 0
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Abstract


With the development of modern industry, polar organic diluents separation become a widespread problem. Reversible complex extraction of polar organic diluents separation with high efficiency and high selectivity by more and more researchers' attention. Amphoteric compound has both Lewis acid and Lewis base two kinds of functional groups, has a unique chemical, physical and biological properties, and is widely used in chemical, biological, pharmaceutical and other fields. In the vast literature on the basis of research, the paper used Trialkylamine (7301) as complexing agent and the 7301 tributyl phosphate (TBP) as extractant, using complex extraction method for a class of typical gender organics - picolinate [1 - pyridine carboxylic acid 3 - pyridine carboxylic acid (niacin) and 4 - picolinic acid (isonicotinic acid)] for a more systematic study examines the complexing agent concentration, diluent type, pH and water equilibrium solute concentration on the extraction equilibrium effects; and on this basis, using infrared spectroscopy speculated reaction mechanism of the extraction process, the establishment of a mathematical model of the reaction; based on a large number of experimental data, to identify the main factors affecting the extraction equilibrium. The results showed that: polar diluent conducive 7301 pairs picolinic acid extraction; distribution ratio at a concentration of 7301 0.4218mol / L when the maximum; equilibrium with the pH of the water increases, the distribution ratio of the neutral solute molecule (or zwitterionic) and anion peak areas; picolinate increases solute concentration distribution ratio decreased. Fourier transform infrared spectroscopy using n-octanol system, picolinic acid, extractant and the organic phase solute load analysis, found that: n-octanol system, pyridine carboxylic acid with n-octanol by hydrogen bonds between Direct effect of the organic phase, the organic phase reaction of the body in 7301; 7301 picolinate mainly neutral molecules (or zwitterionic) and anion reacts ionic association the same structure, and the water does not affect the equilibrium pH 7301 and extracted complexes formed picolinate structure. In experimental studies based on the effect of pH on the extraction equilibrium and the extracted complex structures, for 7301 / octanol picolinate system, taking into account the role of chemical extraction and physical extraction, distribution ratio of expression established and intends to combined the apparent equilibrium constant K values. The results show that the accuracy of the model fit is satisfactory. The apparent basicity of the complexing agent, diluent polarity, and the electrical parameters of solutes and the hydrophobic parameter logP pKa is an important factor affecting the extraction equilibrium, and it was associated with the logK. The results show that in the studied system, the electrical parameters and a hydrophobic parameter logP pKa is caused by the distribution ratio picolinate generated mainly due to differences. For picolinate dilute solution system, this paper also uses 7301 TBP mixed complexing agent system equilibrium experimental study was carried out. The results show that mixed extractant 7301 TBP right picolinate has obvious synergistic effect. Mixed extractant, 7301 or TBP concentration on the extraction equilibrium greater impact; maximum allocation than in the neutral molecules and anions picolinate region; confirmed by IR, collaboration - complexation extraction process exist 7301, TBP solute complexation reactions and mixed extractant solute synergies; 7301 and TBP extraction system exists the optimum ratio, then allocate relatively large; and 7301 picolinate complex extraction process, as compared with the distribution of the concentration of picolinate The decreases

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Heterocyclic compounds > Six heterocycles containing a single different atoms > Triazine (pyridine ) family > Triazine (pyridine ) homologues and their derivatives
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