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Piperazine and methyldiethanolamine interrelationships in CO 2 absorption by aqueous amine mixtures. Part II —Saturation rates of mixed reagent solutions
Author(s) -
Costa Camilla,
Di Felice Renzo,
Moretti Paolo,
Oliva Maddalena,
Ramezani Rouzbeh
Publication year - 2020
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23820
Subject(s) - piperazine , reagent , chemistry , aqueous solution , amine gas treating , absorption (acoustics) , organic chemistry , materials science , composite material
This work is a companion to a previous article, Part I, published in The Canadian Journal of Chemical Engineering, dealing with CO 2 absorption in aqueous solutions containing a single aminic reagent (specifically methyldiethanolamine (MDEA) or piperazine (PZ)). In this second part, different PZ/MDEA mixtures are experimentally studied and their performances are compared with that of the single reagents. It is indeed well known that small quantities of PZ added to MDEA aqueous solutions are sufficient to obtain a significant improvement in the kinetics of the process. PZ is considered an activator or promoter for MDEA, but the mechanism of this synergy has still not been clearly demonstrated. The aim of this study is an attempt to understand how PZ and MDEA can interact by experimentally analyzing this beneficial mutual effect and by explaining it with the help of a suitable yet not complex model. We believe that the involved chemistry is not more complex than that reported in Part I for the single reagents. According to our findings, it is MDEA that enhances the action of PZ, as opposed to what many authors claim. Moreover, our results seem to rule out the existence of any PZ shuttle effect.