Process for CO₂ Capture Using Ionic Liquid That Exhibits Phase Change

Abstract

A novel process for capturing carbon dioxide from the flue gas of a coal-fired power plant has been shown to reduce parasitic power consumption substantially. The process employs an ionic liquid created at the University of Notre Dame that has a high capacity for absorbing CO 2 by chemical reaction. A distinguishing property of this ionic liquid is that it changes phase from solid to liquid upon reaction with CO 2 . The process uses heat generated by this phase transition to lower parasitic power consumption. The driving force for CO 2 separation is a combination of temperature and pressure differences; the process could even work without the addition of heat. A realistic process was created to capture CO 2 efficiently. Computer simulation of the process enabled calculation of viable process conditions and power usage. The main concepts of the process were shown to work using a lab-scale apparatus. Parasitic power consumes 23% of net power generation, 55% lower than that of the monoethanolamine (MEA) process. However, capital cost is higher. The cost of electricity (COE) is 28% lower than that of the MEA process.

Carbon Dioxide Capture with Ionic Liquids and Deep Eutectic Solvents: A New Generation of Sorbents

“…Thus, it was concluded that the PCILs were more energy‐efficient candidates than the aqueous amine solutions. Among the studied PCILs, [P 2222 ][BnIm] was the most promising candidate for CO 2 capture …”

“…Amongt he studied PCILs,[ P 2222 ][BnIm] was the most promising candidate for CO 2 capture. [113,115] Seo et al also, synthesized af amily of ILs containing the alkylphosphonium cation with AHA-based anions( e.g.,p yrrolide, pyrazolide, triazolide, imidazolide, and indazolide). [114] The results revealed that the cations had only am inor effect on absorption; they affected the physical properties of AHA ILs, such as viscosity.T he AHA-derivedI Ls remainedl iquid under ambient conditions owing to the presence of bulky and unsymmetrical alkyl chains coupled to the phosphonium groups.…”

Challenges and opportunities for the utilisation of ionic liquids as solvents for CO2capture

“…Eisinger and Keller conducted a similar study for ILs that undergo a liquid-solid phase change, however their economic assessment relies on vendor quotes. 26 Zhai 30 and de Riva for selected…”

Low Heat of Adsorption of Ethylene Achieved by Major Solid‐State Structural Rearrangement of a Discrete Copper(I) Complex

“…−52 kJ mol −1 ) and noted for significantly reducing of the overall heat of adsorption . A process design taking advantage of the lower overall heat of adsorption showed 55 % energy savings compared to standard monoethanolamine (MEA) scrubbing technology …”