1-Ethyl-3-methylimidazolium chloride, CAS: 65039-09-0

Key Applications:

Deep Eutectic Solvents (DES) and Solvent Engineering

• Serves as a hydrogen‑bond acceptor for forming Type III DES with urea, glycerol, ethylene glycol, and other polyols.
• Enables tunable polarity and viscosity profiles for extraction, catalysis, biomass fractionation, and metal dissolution.
• Used in DES‑based pretreatment of lignocellulosic biomass to enhance delignification and sugar release.
• Supports metal‑ion complexation and selective dissolution in hydrometallurgical and recycling workflows.

SO₂ Absorption and Gas Handling

• Demonstrates high SO₂ solubility due to strong Lewis acidity and chloride coordination, making it suitable for reversible SO₂ capture.
• Applied in flue‑gas desulfurization research as a benchmark ionic liquid for absorption capacity and regeneration studies.
• Useful in mechanistic studies of acid‑gas interactions, including speciation, binding energetics, and absorption kinetics.

Conductivity and Electrochemical Systems

• Exhibits relatively high ionic conductivity among chloride‑based imidazolium salts, supporting use in electrochemical devices.
• Functions as a component in molten‑salt electrolytes for metal electrodeposition (Al, Zn, rare‑earth metals).
• Employed in ionic‑liquid‑based capacitors, redox‑flow systems, and conductivity‑tuning blends with other ILs or DES formulations.
• Used as a model chloride ionic liquid for studying ion transport, viscosity–conductivity relationships, and temperature‑dependent mobility.

Catalysis and Reaction Media

• Provides a polar, non‑volatile medium for acid‑catalyzed transformations, alkylation, esterification, and nucleophilic substitution.
• Stabilizes reactive intermediates and supports phase‑transfer catalysis in chloride‑rich environments.
• Enables metal‑catalyzed coupling reactions where chloride coordination influences catalyst speciation.

Materials Processing and Polymer Chemistry

• Acts as a solvent and swelling agent for cellulose, chitin, and other biopolymers.
• Used in polymer electrolyte formulations and ion‑conductive films.
• Supports nanoparticle synthesis where chloride availability influences nucleation and growth.

Metal Processing and Electroplating

• Provides a molten‑salt medium for electrodeposition of aluminum and other metals at moderate temperatures.
• Facilitates dissolution and separation of metal oxides and salts in recycling and refining workflows.

Analytical and Spectroscopic Uses

• Serves as a calibration and reference ionic liquid for conductivity, viscosity, and ion‑transport studies.
• Used in spectroscopic investigations of hydrogen bonding, ion pairing, and chloride coordination.

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