CO2 Solubility in Electrolyte Solution of Potassium Carbonate with the Addition of Promotor Amines (MDEA-DEA/ PZ-DEA) at Various Temperatures

Saidah Altway; Kuswandi Kuswandi; Iqwal Zulfetra; Firda Nuharani

doi:10.5614/j.eng.technol.sci.2016.48.6.3

Authors

Saidah Altway Department of Chemical Engineering Institut Teknologi Sepuluh Nopember, Surabaya 60111
Kuswandi Kuswandi Department of Chemical Engineering Institut Teknologi Sepuluh Nopember, Surabaya 60111
Iqwal Zulfetra Department of Chemical Engineering Institut Teknologi Sepuluh Nopember, Surabaya 60111
Firda Nuharani Department of Chemical Engineering Institut Teknologi Sepuluh Nopember, Surabaya 60111

DOI:

https://doi.org/10.5614/j.eng.technol.sci.2016.48.6.3

Abstract

Carbon dioxide has a huge impact on the increase of greenhouse gas formation causing global warming and climate change. The most effective method to capture CO₂ is chemical absorption using potassium carbonate (K₂CO₃) solution and amines as additive to enhance the absorption rate. CO₂ solubilities in 30% of K₂CO₃ and 5% of the total composition of mixed methyldiethanolamine (MDEA)"?diethanolamine (DEA) / piperazine (PZ)-DEA solutions at various temperatures of 303.15-323.15 K and atmospheric pressure are reported. The solubility data were measured using an equilibrium cell apparatus with the N₂O analogy method. The E-NRTL model was used to correlate the experimental data accurately. The binary interaction parameters of the model for the CO₂-K₂CO₃-MDEA-DEA-H₂O and CO₂-K₂CO₃-PZ-DEA-H₂O systems were obtained. The CO₂ physical solubility in 30% of K₂CO₃, 5% of PZ, and 0% of DEA at 303.15 K had the highest value, while the Henry constant of CO₂ in this solution had the lowest value. The CO₂ loading increased with increasing partial pressure of CO₂, while the CO₂ solubility decreased with increasing temperature. Any increase in MDEA concentration from 0% to 5% enhanced the CO₂ partial pressure, otherwise, an increase in PZ concentration from 0% to 5% decreased the CO₂ partial pressure.

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