The esterification reactions of octanoic acid with 1\|octanol catalyzed by Candida lypolytical (CL) lipase was studied in water\|in\|oil microemulsions formed by water/bis\|(2\|ethylhexyl)sulfosuccinate sodium(AOT)/is...The esterification reactions of octanoic acid with 1\|octanol catalyzed by Candida lypolytical (CL) lipase was studied in water\|in\|oil microemulsions formed by water/bis\|(2\|ethylhexyl)sulfosuccinate sodium(AOT)/isooctane.The results of kinetic study showed that the reaction follows a Ping\|Pong Bi\|Bi mechanism.The values of apparent kinetic parameters were determined.Lipase has also been immobilized in gelatin\|containing AOT microemulsion\|based organogels (MBGs) for retention of catalytic activity.These lipase\|containing MBGs proved to be a solid\|phase catalysts for use in apolar organic solvents,retaining its higher activity after many runs of esterification reactions.展开更多
The effect of octanol in cassiterite flotation using benzohydroxamic acid (BHA) as a collector was investigated. Theadsorption mechanism of octanol and BHA on the surface of cassiterite was analyzed by adsorption expe...The effect of octanol in cassiterite flotation using benzohydroxamic acid (BHA) as a collector was investigated. Theadsorption mechanism of octanol and BHA on the surface of cassiterite was analyzed by adsorption experiments and infrared spectraanalysis. Micro-flotation results indicated that single octanol exhibited almost no collecting power to cassiterite over a wide pHrange. However, as an auxiliary collector, octanol could markedly decrease the consumption of collector BHA and keep the recoveryof cassiterite in high level. The results of adsorption experiments and infrared spectra demonstrated that single octanol was notadsorbed on the surface of cassiterite. It formed adsorption connected with BHA on the surface of cassiterite, and enhanced thehydrophobicity of cassiterite. Octanol promoted the adsorption amount of BHA on the cassiterite surface, and decreased theconsumption of BHA.展开更多
In this paper, the nitration characteristic of alcohols with mixed acid for the synthesis of energetic mate-rials in a stainless steel microreactor was investigated experimentally. The nitration of iso-octanol with HN...In this paper, the nitration characteristic of alcohols with mixed acid for the synthesis of energetic mate-rials in a stainless steel microreactor was investigated experimentally. The nitration of iso-octanol with HNO3-H2SO4 mixed acid was chosen as a typical model reaction which involved fast and strong exothermic liquid-liquid heterogeneous reaction process. The influences of mixed acid composition, flow rate, organic/aqueous flow ratio and reaction temperature have been investigated. The results indicated that the reaction could be con-ducted safely and stably in the microreactor at 25-40°C, which are enhanced compared to 15°C or below for safe operating conditions in the conventional reactors. Moreover, the 98.2% conversion of iso-octanol could be obtained and no by-products were detected in all cases.展开更多
The solid-liquid equilibrium of benzoic acid derivatives in 1-octanol was first determined in this article. Using a laser monitoring observation technique, the solubility data of o-amino-benzoic acid, p-amino-benzoic ...The solid-liquid equilibrium of benzoic acid derivatives in 1-octanol was first determined in this article. Using a laser monitoring observation technique, the solubility data of o-amino-benzoic acid, p-amino-benzoic acid,o-chloro-benzoic acid, and m-nitro-benzoic acid in 1-octanol were measured by the polythermal method in the temperature range of 20-50℃. The experimental data were regressed with the. Wilson equation and the λH equation. The experimental results showed that the solubility of the four chemicals in 1-octanol increased significantly with temperature. The results indicate that the molecular structure and interactions affect the solubility significantly.The solubility order of the benzoic acid derivatives is as follows： m-nitro-benzoic acid〉o-chloro-benzoic acid〉 o-amino-benzoic acid〉p-amino-benzoic acid. Both the Wilson equation and λH equation are in good agreement with the experimental data.展开更多
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 ded...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.展开更多
文摘The esterification reactions of octanoic acid with 1\|octanol catalyzed by Candida lypolytical (CL) lipase was studied in water\|in\|oil microemulsions formed by water/bis\|(2\|ethylhexyl)sulfosuccinate sodium(AOT)/isooctane.The results of kinetic study showed that the reaction follows a Ping\|Pong Bi\|Bi mechanism.The values of apparent kinetic parameters were determined.Lipase has also been immobilized in gelatin\|containing AOT microemulsion\|based organogels (MBGs) for retention of catalytic activity.These lipase\|containing MBGs proved to be a solid\|phase catalysts for use in apolar organic solvents,retaining its higher activity after many runs of esterification reactions.
基金Project(B14034)supported by the National "111" Project of Ministry of Education of ChinaProject(2015CX005)supported by the Innovation Driven Plan of Central South University,ChinaProject supported by the 2014 Sublimation Scholar Program of Central South University,China
文摘The effect of octanol in cassiterite flotation using benzohydroxamic acid (BHA) as a collector was investigated. Theadsorption mechanism of octanol and BHA on the surface of cassiterite was analyzed by adsorption experiments and infrared spectraanalysis. Micro-flotation results indicated that single octanol exhibited almost no collecting power to cassiterite over a wide pHrange. However, as an auxiliary collector, octanol could markedly decrease the consumption of collector BHA and keep the recoveryof cassiterite in high level. The results of adsorption experiments and infrared spectra demonstrated that single octanol was notadsorbed on the surface of cassiterite. It formed adsorption connected with BHA on the surface of cassiterite, and enhanced thehydrophobicity of cassiterite. Octanol promoted the adsorption amount of BHA on the cassiterite surface, and decreased theconsumption of BHA.
基金Supported by the National Natural Science Foundation of China (20490208)the National High Technology Research and Development Program of China (2007AA030206)the Open Fund of State Key Laboratory of Explosion Science and Technology,BIT (KFJJ06-1)
文摘In this paper, the nitration characteristic of alcohols with mixed acid for the synthesis of energetic mate-rials in a stainless steel microreactor was investigated experimentally. The nitration of iso-octanol with HNO3-H2SO4 mixed acid was chosen as a typical model reaction which involved fast and strong exothermic liquid-liquid heterogeneous reaction process. The influences of mixed acid composition, flow rate, organic/aqueous flow ratio and reaction temperature have been investigated. The results indicated that the reaction could be con-ducted safely and stably in the microreactor at 25-40°C, which are enhanced compared to 15°C or below for safe operating conditions in the conventional reactors. Moreover, the 98.2% conversion of iso-octanol could be obtained and no by-products were detected in all cases.
基金Supported by the National Natural Science Foundation of China （No.20676101） and the Natural Science Foundation of Tianjin University of Science ＆ Technology （No.20050207）.
文摘The solid-liquid equilibrium of benzoic acid derivatives in 1-octanol was first determined in this article. Using a laser monitoring observation technique, the solubility data of o-amino-benzoic acid, p-amino-benzoic acid,o-chloro-benzoic acid, and m-nitro-benzoic acid in 1-octanol were measured by the polythermal method in the temperature range of 20-50℃. The experimental data were regressed with the. Wilson equation and the λH equation. The experimental results showed that the solubility of the four chemicals in 1-octanol increased significantly with temperature. The results indicate that the molecular structure and interactions affect the solubility significantly.The solubility order of the benzoic acid derivatives is as follows： m-nitro-benzoic acid〉o-chloro-benzoic acid〉 o-amino-benzoic acid〉p-amino-benzoic acid. Both the Wilson equation and λH equation are in good agreement with the experimental data.
基金Supported by the Ministry of Education of Henan Province in China (2011A610004)
文摘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.
