Advancements and Persistent Challenges in Gas Sweetening: A Review of Alkylamine lonic Liquids for High-Temperature CO2 Capture and Mineralization

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Provides a structured overview of AIL performance, mechanism, and integration pathways for CO2 capture and mineralization, useful for identifying research gaps.

🏢実務担当者:Offers techno-economic benchmarks and process parameters for companies evaluating carbon capture options in natural gas operations.

🏛政策担当者:Summarizes the current state and challenges of an emerging CCUS technology, relevant for designing R&D incentives and deployment policies.

This review provides a comprehensive technical assessment of the utilization of alkylamine ionic liquids (AILs) for the combined processes of natural gas sweetening and subsequent carbon dioxide (CO2) mineralization. Driven by the need for more energy-efficient and environmentally benign alternatives to conventional amine scrubbing technologies (e.g., using monoethanolamine, MEA), AILs offer potential advantages such as negligible vapor pressure, high thermal stability, and structural tunability. This review synthesizes experimental, mechanistic, and techno-economic studies published between 2010 and 2025, with emphasis on AIL-based absorption, high-temperature operation, and integrated mineralization pathways. The analysis focuses on a specific process involving AIL-water mixtures (30 mol% water) operating at 328–366 K with pressure swing regeneration, coupled with catalytic CO2 mineralization using KOH or CaO. Performance evaluation indicates that certain AILs and AIL-amine blends demonstrate high acid gas loading capacities and potentially faster kinetics, leveraging weaker chemisorption for non-thermal regeneration. The integration of CO2 mineralization presents a pathway for permanent CO2 fixation, with reported mineralization step, based on CaO- or Ca(OH)₂-driven carbonation, has demonstrated CO₂ conversion efficiencies exceeding 60% of the theoretical maximum under slurry-phase conditions (typically 323–353 K and moderate agitation), indicating meaningful but still non-quantitative carbonate formation in experimentally reported systems. However, significant technical and economic challenges, including high synthesis costs, viscosity, and a lack of long-term stability data, impede large-scale deployment. This review critically evaluates the process fundamentals, compares performance against conventional technologies, and outlines future research directions required to bridge the gap from laboratory potential to industrial viability.

• semanticscholar https://doi.org/10.37933/nipes/8.2.2026.2066first seen 2026-06-19 05:31:49