Carbon Capture with 4 m Piperazine/4 m 2-Methylpiperazine
Year: 2013
Type: conference-paper
Abstract: An equimolar diamine blend of 4 m 2-methylpiperazine (2MPZ) with 4 m piperazine (PZ) is shown to be an attractive solvent for CO2 capture. This blend overcomes the difficulties posed by the narrow solid solubility window of pure 8 m PZ while preserving its benefits. The solid solubility window at 20 °C broadens from to . As the blend viscosity is nearly double that of pure PZ, normalizing the capacity by viscosity shows a practical capacity comparable to MEA at 0.63 mol CO2/kg solvent. The CO 2 absorption rate of the blend is lower, with at 40 °C, 84% that of PZ. The heats of CO 2 absorption of the blend and PZ are equal at Δ H abs = 70 kJ/mol. While the blend thermal stability is decreased, T max = 155 compared to 163 °C, oxidative stability is similar. Lastly, their volatilities are nearly equal with amine Henry's constant near 23 Pa at 40 °C. In short, the equimolar blend of 4 m 2MPZ with 4 m PZ is a competitive solvent for amine scrubbing.
Source: Energy Procedia
Authors: Brent Sherman, Xi Chen, Thu Nguyen, Qing Xu, Humera Rafique, Stephanie A. Freeman, Alexander K. Voice, Gary T. Rochelle
Institution: The University of Texas at Austin
Language: English
Subfield: Filtration and Separation
Field: Chemical Engineering
Domain: Physical Sciences
SDG: Climate action
Open Access status: diamond
OpenAlex ID: W2000970559