Indian Journal of Science and Technology

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A simple pH-based method for estimation of CO2 absorbed in alkanolamines


Affiliations
1 Indian Institute of Petroleum, Mohkampur, Dehradun, Uttarakhand, 248005, India
2 Chemical Metrology Section, National Physical Laboratory, New Delhi, 110012
3 Indian Institute of Petroleum, Mohkampur, Dehradun, Uttarakhand, 248005
 

CO2 is recognized as a major contributor of global warming. We report a facile, sensitive and accurate method for estimating CO2 content in the alkanolamine solvents. It can be applied to a host of alkanolamine solvents as well as solvent mixtures for screening for prospective absorbent for CO2 capture. In this method, pH of the CO2-loaded absorbent sample is measured and referred to a "reference pH graph" of corresponding amine with sulphuric acid that is constructed under specific conditions. The authenticity of the method was validated from known amounts of CO2 added in the form of CO2-saturated water to three different types of alkanolamines i.e. the primary (monoethanolamine, MEA), secondary (diethanolamine, DEA) and tertiary (triethanolamine, TEA) alkanolamines. The method was compared with known methods and found to be better in terms of accuracy.

Keywords

CO2 Estimation, pH, Pka, Alkanolamines, Gas Absorption
User

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  • A simple pH-based method for estimation of CO2 absorbed in alkanolamines

Abstract Views: 503  |  PDF Views: 156

Authors

Asha Masohan
Indian Institute of Petroleum, Mohkampur, Dehradun, Uttarakhand, 248005, India
Mamshad Ahmed
Indian Institute of Petroleum, Mohkampur, Dehradun, Uttarakhand, 248005, India
Sushil Kumar Nirmal
Indian Institute of Petroleum, Mohkampur, Dehradun, Uttarakhand, 248005, India
Ajay Kumar
Chemical Metrology Section, National Physical Laboratory, New Delhi, 110012
Madhukar Onkarnath Garg
Indian Institute of Petroleum, Mohkampur, Dehradun, Uttarakhand, 248005

Abstract


CO2 is recognized as a major contributor of global warming. We report a facile, sensitive and accurate method for estimating CO2 content in the alkanolamine solvents. It can be applied to a host of alkanolamine solvents as well as solvent mixtures for screening for prospective absorbent for CO2 capture. In this method, pH of the CO2-loaded absorbent sample is measured and referred to a "reference pH graph" of corresponding amine with sulphuric acid that is constructed under specific conditions. The authenticity of the method was validated from known amounts of CO2 added in the form of CO2-saturated water to three different types of alkanolamines i.e. the primary (monoethanolamine, MEA), secondary (diethanolamine, DEA) and tertiary (triethanolamine, TEA) alkanolamines. The method was compared with known methods and found to be better in terms of accuracy.

Keywords


CO2 Estimation, pH, Pka, Alkanolamines, Gas Absorption

References





DOI: https://doi.org/10.17485/ijst%2F2009%2Fv2i4%2F29433