| 二氧化碳、碳酸氢盐与有机伯胺和仲胺反应机理 |
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| 引用本文： | 张国辉,王晓光,William Conway,Marcel Maeder,孙琦,于海. 二氧化碳、碳酸氢盐与有机伯胺和仲胺反应机理[J]. 化工学报, 2013, 64(8): 2883-2890. DOI: 10.3969/j.issn.0438-1157.2013.08.026 |
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| 作者姓名： | 张国辉 王晓光 William Conway Marcel Maeder 孙琦 于海 |
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| 作者单位： | 1. 神华研究院, 北京 102209;2. 澳大利亚纽卡斯尔大学化学系, 新南威尔士州, 纽卡斯尔 2308;3. 北京低碳清洁能源研究所, 北京 102209;4. 澳大利亚联邦科学与工业研究组织, 新南威尔士州, 纽卡斯尔 2304 |
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| 基金项目： | 国家自然科学基金煤炭联合基金项目(51134017).supported by the National Natural Science Foundation of China |
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| 摘 要： | 采用停留光谱法和核磁共振(氢谱)法系统地研究了二氧化碳(aq)、碳酸氢盐与一乙醇胺(MEA)、L-氨基丙醇(2-AP)、1-氨基-2-丙醇(1-AP)、N-甲基正丙胺(IBA)、3-氨基丙醇(3-AP)、二乙醇胺(DEA)、吗啉(MORP)、哌啶(PIPD)和4-哌啶甲醇(4-PIPDM)在水溶液中25℃下的反应动力学,阐明其反应机理,给出二氧化碳、碳酸氢盐与有机胺的反应速率常数、氨基甲酸盐质子化常数和氨基甲酸盐的稳定常数。研究发现:二氧化碳与伯胺和仲胺的反应速率常数与其氨基甲酸盐的稳定常数具有线性关系。发现氨基甲酸盐稳定常数代表液态有机胺(氨)分子的空间位阻效应、溶剂化效应和电子效应的协同作用,它对于设计新型液态有机胺分子具有重要理论指导作用。
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| 关 键 词： | 反应动力学 二氧化碳 有机胺 碳酸氢盐 氨基甲酸盐 |
| 收稿时间： | 2012-11-01 |
| 修稿时间： | 2013-05-24 |
Kinetics of CO2(aq), HCO3-with primary and secondary amines in aqueous solution |
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| ZHANG Guohui , WANG Xiaoguang , William Conway , Marcel Maeder , SUN Qi , YU Hai. Kinetics of CO2(aq), HCO3-with primary and secondary amines in aqueous solution[J]. Journal of Chemical Industry and Engineering(China), 2013, 64(8): 2883-2890. DOI: 10.3969/j.issn.0438-1157.2013.08.026 |
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| Authors: | ZHANG Guohui WANG Xiaoguang William Conway Marcel Maeder SUN Qi YU Hai |
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| Affiliation: | 1. Shenhua R&D Institute, Beijing 102209, China;2. Department of Chemistry, University of Newcastle, Newcastle 2308, NSW Australia;3. National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China;4. CSIRO Energy Technology, Newcastle 2304, NSW Australia |
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| Abstract: | The reaction kinetics of of CO2(aq),HCO3- with monoethanol amine(MEA),2-amino-1-propanol(2-AP),1-amino-2-propanol,iso-butyl amine(IBA),3-amino-1-propanol(3-AP),diethanol amine(DEA),morpholine(MORP),piperidine(PIPD),and 4-piperidine methanol(4-PIPDM)in aqueous solution at 25℃ was investigated by stopped-flow and 1H NMR spectrometric technologies.One plausible and universal mechanism was proposed.The rate constants for reactions of CO2(aq),HCO3- with the selected amines,the protonation constant of carbamate,and the stability constant of carbamates were obtained by the fitting results.The plot of lgk7 versus lgK9 was linear for the primary and secondary amines,respectively.The above relationships indicated that the stability constant of carbamate represented the overall contribution of its electronic,steric and solvation effects.This discovery may provide a theoretical guidance for the design of novel poly-amines in improving CO2 capture efficiency. |
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| Keywords: | reaction kinetics CO2 amine bicarbonate carbamate |
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