Reaction Kinetics of Carbon Dioxide (CO2) with Diethylenetriamine and 1-Amino-2-propanol in Nonaqueous Solvents Using Stopped-Flow Technique
Nan ZhongHelei LiuXiao LuoMohammed J. Al‐MarriAbdelbaki BenamorRaphael IdemPaitoon TontiwachwuthikulZhiwu Liang
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Abstract:
In this work, the reaction kinetics of carbon dioxide (CO2) with diethylenetriamine (DETA) and 1-amino-2-propanol (1-AP) in methanol and ethanol systems were measured using the stopped flow technique over a temperature range of 293–313 K in terms of pseudo-first-order rate constant (k0). Concentration in the range of 10 to 50 mol/m3 for diethylenetriamine, and 20 to 100 mol/m3 for 1-amino-2-propanol were studied. The experimental data show that the pseudo-first-order rate constants (k0) increase with the increase of both amine concentration and temperature. The zwitterion mechanism and the termolecular mechanism were used to represent the data for DETA in methanol and ethanol systems with excellent ADDs of 3.5% and 2.4%, respectively, and 1-AP in methanol and ethanol systems with excellent ADDs of 2.4% and 2.6%, respectively. In comparison with EDA and AEEA in terms of k2, DETA exhibits a better reaction kinetics performance for capturing CO2. Those results will be useful in finding an efficient method for the removal of CO2 from industrial gases.Keywords:
Diethylenetriamine
Zwitterion
Propanol
Zwitterion
Piperazine
Reaction rate
Alkanolamine
Elementary reaction
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Reaction rate
Transition state
Elementary reaction
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Sensitivity method used for reducing the chemical reaction kinetics model is introduced. In this method, with the aid of principal component analysis of the matrix F~TF where F is the rate sensitivity matrix, relatively important reactions can be identified from the complex reaction system by ranking the significant eigenvector elements of reaction subgroup with large eigenvalues of matrix F~TF. This method is further applied to analyze two chemical reactions, i.e., the high-temperature formaldehyde oxidation reaction and the carbon monoxide/hydrogen/air combustion reaction. The results show that both reactions can be significantly reduced by this method and the calculated species concentrations from reduced mechanism agree well with those calculated from detailed mechanism.
Matrix (chemical analysis)
Reaction rate
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Half-reaction
Thermochemistry
Reaction rate
Reaction calorimeter
Stepwise reaction
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Existing explanations of reaction mechanism of case study reaction of chemical kinetics between Cr(III) ions and ethylenediaminetetraacetic acid (EDTA) contradicts to modern chromium(III) coordination chemistry data. Absorption UV and visible light spectra were therefore recorded during the reaction between aqueous solution of Cr(NO 3 ) 3 and EDTA in order to obtain a new insight into this reaction. Analysis of the obtained spectra showed that only very small fraction of intermediates can be present in solution during course of the reaction. The reaction scheme was established and according to it a simplified model calculations carried out using literature data constants when available and adjusted values of their sound estimates when they were missing. Reasonable agreement of model calculations with experimental data was obtained at pH values of 3.8 and 4.5 but the model failed to reproduce measured rate of reaction at pH 5.5, probably due to use of oversimplified model.
Ethylenediaminetetraacetic acid
Reaction rate
Elementary reaction
Reaction intermediate
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The homogeneous intramolecular isomerization reactions of all the isomers of [Co(dien)2] (ClO4)3 and [Co(dien)(medien)] (ClO4)3 (dien, diethylenetriamine; medien, 4-methyldiethylenetriamine) have been studied at 90°C under atmospheric pressure and conditions of high pressure. The isomerization reactions are retarded by an increase in pressure, and for a given starting isomer of each system: the various isomerization processes are affected uniformly. For each system, the same equilibrium isomer distribution was obtained regardless of starting isomer or of the pressure conditions of the experiment. The results are interpreted on the basis of a common mechanism for all isomerizations, involving Co-N bond-rupture followed by rearrangement of the resultant five-coordinate species.
Diethylenetriamine
Biocatalysis
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The reaction mechanism and chemical reaction kinetics of N-(diethylenediamino) perfluoroheptyl acidamide is studied.by synthesized dissolvent means,N-(diethylenediamino) perfluoroheptyl acidamide was synthesized with perfluorocaprylic acid and diethylenetriamine and the high efficiency catalyst(CATP),and the reaction mechanism and chemica-l reaction kinetics are studied.The result showes that the yield could reaches to 96%,as the reaction rate k=0.7007×10-3 s-1 after 3h in 130℃.This reaction accorded with the proton condensation reaction mechanism and the first order reaction.
Diethylenetriamine
Condensation reaction
Reaction rate
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The kinetics and mechanism of the reaction of Si3N4 with Fe were investigated. Using powdered Si3N4-Fe mixture, the reaction rates were measured by means of a thermobalance at temperatures from 1373 to 1673 K in Ar or N2 gas stream. The reaction products were examined by X-ray diffraction.The reaction of Si3N4 with Fe was initiated after heating to about 1350 K. The reaction product changed from Fe-Si solid solution to Fe silicide Fe3Si, as the reaction proceeded. The reaction rates and the reaction products were independent on the atmosphere. The kinetics obeyed the nearly parabolic rate law. The formation of Fe3Si increased the rate constant abruptly. The apparent activation energy was 533 kJ/mol in the region of Fe-Si solid solution. The reaction rates of Si3N4 with Fe are probably mixed-controlled by both the interfacial reaction and the diffusion through the reaction layer.
Reaction rate
Rate equation
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Diethylenetriamine
Zwitterion
Base (topology)
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