Overview
Mixed Butanol is a blend of butyl alcohol isomers (n-butanol, isobutanol, and sec-butanol) commonly produced via oxo synthesis or fermentation. As an industrial-grade solvent, it balances cost-effectiveness with performance, offering a middle ground between faster-evaporating alcohols like ethanol and slower solvents like glycol ethers. The mixture's exact composition varies by manufacturer but typically contains 40-70% n-butanol, 20-40% isobutanol, and 5-20% sec-butanol. This variability allows formulators to fine-tune evaporation rates and solvency for specific applications.
Physical and Chemical Properties
Mixed Butanol exhibits intermediate polarity, making it effective for dissolving both polar resins (e.g., nitrocellulose) and non-polar compounds (e.g., oils). Its evaporation rate (0.4-0.6 relative to n-butyl acetate) suits applications requiring controlled drying, such as automotive coatings. The blend's flash point ranges from 28-35°C, classifying it as a flammable liquid. Viscosity is low (3-4 cP at 20°C), ensuring easy handling. Unlike pure n-butanol, the mixture often has improved cold temperature stability due to isobutanol's lower freezing point.
Main Applications
In coatings, Mixed Butanol acts as a latent solvent for acrylics and urethanes, reducing viscosity during application while minimizing blushing. It's particularly valued in wood finishes for enhancing flow without excessive drying retardation. The plasticizer industry uses it as an esterification feedstock for phthalates and adipates. Secondary uses include extractive distillation processes and as a component in industrial cleaners where its balanced solvency prevents material damage.
Safety and Storage
Store in grounded containers (stainless steel or polyethylene) with inert gas padding if long-term storage is needed. Electrostatic accumulation must be prevented during transfer operations. Compatibility testing is recommended for gaskets and seals—Buna-N and Viton are generally suitable. Exposure controls should maintain airborne concentrations below 50 ppm (ACGIH TLV). Spills require absorbents like vermiculite; water flushing is ineffective due to partial solubility and may spread contamination.
B2B Procurement Guide
When sourcing Mixed Butanol, specify: 1) Isomer ratio tolerances (±5% is typical), 2) Maximum water content (0.1% for most applications), 3) Peroxide inhibitors if extended storage is anticipated. Bulk purchases (ISO tank containers) typically offer 10-15% cost savings versus drum quantities. Quality verification should include GC analysis for composition and Karl Fischer titration for water content. Asian suppliers often provide cost-competitive grades, while European producers emphasize tighter composition control for niche applications.
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