13CNMR定量分析一乙醇胺(MEA)与CO2的吸收和解吸特性.pdf

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化工进展
2?14年第33卷第11期
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
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13CNMR定量分析一乙醇胺(MEA)与CO2的吸收和解吸特性
郭超,陈绍云,陈思铭,张永春
(大连理工大学精细化工国家重点实验室,辽宁大连116023)
摘要:CNMR是一种有效的测定有机胺与CO2反应过程中离子浓度变化的检测手段。本文采用CNMR分析
了一乙醇胺(MEA)吸收与解吸CO2过程,吸枚与解吸实验温度分別在313K和393K下进行。结果表明,吸收
CO2过程中生成了MEA氨基甲酸盐、质子胺MEAH与HCO3/CO32,并且CO2与MEA反应时先生成MEA
基甲酸盐,当溶液吸收的CO2担载量达到04550CO2mol胺时,才产生HCO3CO32~离子。在MEA吸收CO
过程中,MEA氨基甲酸盐的摩尔分数先增加后减少。在解吸过程中,MEA氨基甲酸盐的摩尔分数同样先增加后
减少。HCO3CO32在解吸过程中很容易就能被解吸,而生成的MEA基甲酸盐中大约有75%在解吸过程中并
没有被解吸
关键词:二氧化碳捕集;核磁共振;吸收;解吸
中图分类号:TQ319
文献标志码:;A
文章编号:1000~6613(2014)11-3101-06
DO0I:10.3969jiss.-1000-6613,2014.11.044
Quantitative analysis on CO2 absorption and desorption II
monoethanolamine(MEA)solution by using"C NMR
GUO Chao, CHEN Shaoyun, CHEN Siming, ZHANG Yongchun
State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, Liaoning, China)
Abstract: NMR spectroscopy is a suitable analytical method to get quantitative information on the
species distribution in aqueous amine solutions loaded with carbon dioxide(CO2)."C NMR is used for
quantitative analysis on CO2 absorption and desorption in monoethanolamine(MEA)solution
Temperatures of absorption and desorption experiments are 313K and 393K, respectively. From
A'C NMR spectroscopy, It Is found that the main MEA species under the absorption conditions studied
are free amine, protonated amine, MEA carbamate, and HCO3 /C03". At absorption step, MEA
carbamate is produced first, when CO2 loading is getting higher to 0.455mol CO2/mol amine in this
experiment, HCO; /CO]"appears. The mole fraction of the MEA carbamate increases first with
absorption time, reaches their maximum, and then decreases. The mole fraction of HCO3 /CO
consistently increases with the increase of absorption time. At the desorption step, the mole fraction of
MEA carbamate increases at early stage, reaches a maximum, and then decreases up to the end. After
the desorption process, all HCO; /CO can be stripped while about 75% of MEA carbamate still exist
in the MEA solution
Key words: carbon dioxide capture; nuclear magnetic resonance(NMR); absorption; desorption
当前有很多种捕集工业废气中CO2的方法,其
中最有效的方法就是采用有机胺吸收CO2"到。许多收稿日期:20?4,0423:修改稿日期:2014062.
学者研究了醇胺溶剂的结构、反应温度、浓度对有
第一作者:郭超(1986一),男,博士研究生,研究方向为有机胺捕集
CO2. E-mail dlutguochao(@163. con
联系人:张永春,教授,博士
机胺吸收解吸CO2能力的影响?。在这些胺溶剂导师,研究方向为气体分离及转化。E-mailzalidv558@vip.sina.com