1-Butyl-3-methylimidazolium hydrogensulfate, CAS: 262297-13-2

Key Applications:

Catalysis and Organic Synthesis

• Functions as a strong, thermally stable Brønsted acidic ionic liquid for esterification, transesterification, alkylation, and dehydration reactions.
• Enables solvent–catalyst dual functionality, reducing the need for mineral acids in biomass conversion and fine‑chemical synthesis.
• Supports acid‑catalyzed transformations under mild conditions with improved selectivity and recyclability.

Biomass Processing and Green Chemistry

• Used in hydrolysis and depolymerization of lignocellulosic biomass due to its acidity and ability to disrupt hydrogen‑bond networks.
• Facilitates conversion of carbohydrates into platform chemicals such as HMF and levulinic acid.
• Aligns with sustainable‑processing goals by reducing corrosive waste streams and enabling closed‑loop solvent systems.

Electrochemical and Energy Applications

• Serves as a proton‑conducting ionic liquid for electrochemical devices requiring non‑volatile, thermally stable electrolytes.
• Investigated in fuel‑cell membranes and proton‑exchange systems where water‑free proton transport is advantageous.
• Provides high ionic conductivity and chemical stability across broad temperature ranges.

Separation Science and Extraction

• Acts as a tunable, acidic extraction medium for metal ions, dyes, and organic compounds.
• Useful in biphasic catalytic systems and liquid–liquid extraction workflows where acidity enhances partitioning behavior.
• Supports selective dissolution of inorganic salts and metal oxides.

Materials Processing

• Employed as a processing aid for cellulose, chitin, and other hydrogen‑bonded polymers.
• Enhances dissolution and regeneration processes for advanced materials and membranes.
• Used in nanoparticle synthesis where acidic ionic environments control nucleation and growth.

Industrial and Process Advantages

• High thermal stability and negligible vapor pressure improve safety and reduce emissions.
• Recyclable across multiple reaction cycles, lowering operational costs.
• Compatible with continuous‑flow systems and high‑throughput catalytic platforms.

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