Open AccessThe Effect of Ionic Strength on Protonation Constant of Monoethanolamine in Water at 303K
Author(s) -
Sholeh Ma’mun,
Achmad Chafidz,
Egip Indrayanto,
Panji Kumala Setiawan
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1295/1/012017
Subject(s) - potentiometric titration , protonation , ionic strength , chemistry , ionic bonding , amine gas treating , activity coefficient , titration , absorption (acoustics) , thermodynamics , work (physics) , kinetic energy , inorganic chemistry , organic chemistry , ion , materials science , aqueous solution , physics , quantum mechanics , composite material
Amine-based absorption is a reactive system in which mass transfer and chemical reaction take place simultaneously. Protonation constant (pK a ) is an important equilibrium reaction parameter that can be determined experimentally. The objective of this study is to evaluate the pK a of monoethanolamine (MEA) at different ionic strengths ranging from 0.01 to 6 moles of NaCl/kg of water at 303K by a potentiometric titration method. The results show that the pK a values, in general, increase as the ionic strengths increase. Moreover, the activity coefficients of species were also determined by the extended Debye-Hückel model. The pK a data and the activity coefficients obtained from this work could then be used for the kinetic and thermodynamic modeling in the absorber and desorber design.