1-Ethyl-3-methylimidazolium ethyl sulfate, CAS: 342573-75-5

Key Applications:

1. Biomass Processing & Green Chemistry

• Cellulose dissolution and pretreatment for biofuels, nanocellulose, and biopolymer production.
• Lignin fractionation and depolymerization, enabling selective extraction of aromatic monomers.
• Enhanced enzymatic hydrolysis due to reduced biomass recalcitrance after IL pretreatment.
• Solvent for carbohydrate transformations, including dehydration, esterification, and selective oxidation.

2. Acid‑Catalyzed Organic Transformations

• Esterification and transesterification (biodiesel, specialty esters) with improved reaction rates.
• Friedel–Crafts alkylation/acylation in low‑volatility, recyclable media.
• Dehydration reactions (e.g., alcohol → olefin) where the ethyl sulfate anion provides mild Brønsted acidity.
• Green solvent for multi‑step synthesis, replacing volatile organic solvents in bench‑scale and industrial processes.

3. Electrochemical & Energy Applications

• Electrolyte or co‑solvent in redox‑flow batteries, dye‑sensitized solar cells, and metal‑ion batteries.
• Stable ionic medium for electrodeposition of metals and alloys.
• Conductive additive in polymer electrolytes and ionogels, improving ionic transport and mechanical stability.

4. Catalysis & Reaction Engineering

• Task‑specific catalytic medium for acid‑driven reactions due to the sulfate anion’s proton‑donating character.
• Phase‑transfer catalyst substitute, improving mass transfer in biphasic systems.
• Support for immobilized catalysts, including enzymes and metal complexes.

5. Separation Science & Extraction

• Selective extraction of metal ions, especially transition metals and lanthanides.
• Solvent for liquid–liquid extraction of organic acids, phenolics, and dyes.
• Medium for CO₂ capture, leveraging strong solvation of acidic gases.

6. Formulations, Surfactants & Materials

• Additive in surfactant systems, improving micelle stability and solubilization of hydrophobic species.
• Plasticizer or processing aid for polymers, elastomers, and biopolymers.
• Stabilizing agent in nanoparticle synthesis (metal, metal oxide, carbon‑based).
• Ionogel precursor for flexible electronics, sensors, and membranes.

7. Thermal & Process Engineering

• Heat‑transfer fluid component due to high thermal stability and negligible vapor pressure.
• Solvent for high‑temperature reactions where conventional organics degrade.
• Medium for microwave‑assisted synthesis, benefiting from strong dielectric absorption.

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