Ethanol ($C_2H_5OH$), designated by CAS number 64-17-5, is a clear, colorless, and highly volatile flammable liquid. Also known as ethyl alcohol or grain alcohol, it is a primary alcohol and one of the most widely used organic compounds in the global chemical industry. Ethanol is characterized by its distinct vinous odor and pungent taste. It is produced through two primary methods: the biological fermentation of carbohydrates (starchy or sugary crops like corn and sugarcane) and the chemical synthesis via the catalytic hydration of ethylene.
From a structural perspective, ethanol consists of a short-chain ethyl group linked to a polar hydroxyl group, which grants it unique amphiphilic properties. This allows it to act as a versatile solvent, miscible with water and most organic solvents. Beyond its role as a psychoactive substance in beverages, ethanol serves as a critical industrial feedstock, a high-octane biofuel component, and a potent antiseptic. Due to its flammability and biological activity, its handling is strictly governed by safety protocols and regional excise regulations.
**Versatile Solvency:** Effectively dissolves both polar and non-polar substances, making it a universal solvent in laboratory and industrial settings.
**Renewable Feedstock:** Most industrial ethanol is “bioethanol,” derived from renewable agricultural sources, contributing to a lower carbon footprint compared to petroleum-based alternatives.
**Broad-Spectrum Antimicrobial:** Acts as a powerful disinfectant by denaturing proteins and dissolving lipid membranes of bacteria, viruses, and fungi.
**Low Toxicity Profile:** Compared to methanol or isopropyl alcohol, ethanol presents lower systemic toxicity in many industrial applications.
**Low Freezing Point:** With a freezing point of approximately -114°C, it is an ideal component for cooling systems and de-icing fluids.
**Rapid Evaporation:** High volatility ensures quick drying times in coatings, inks, and sanitizing products.
**Molecular Weight:** 46.07 g/mol.
**Boiling Point:** 78.37°C (173.07°F) at 1 atm.
**Density:** 0.789 g/cm³ at 20°C.
**Azeotropic Nature:** Readily forms a constant-boiling mixture with water at 95.6% ethanol; absolute ethanol (99.9%+) requires specialized dehydration (e.g., molecular sieves).
**Flash Point:** ~13–14°C (55.4–57.2°F) closed cup, classifying it as a Class IB Flammable Liquid.
**Vapor Pressure:** 5.95 kPa at 20°C, contributing to its high volatility.
**Refractive Index:** 1.361, useful for purity verification via refractometry.
**Acidity (pKa):** Approximately 15.9, indicating very weak acidity.
• Electrical and electronics
• Connectors, switches, PCB housings, terminal blocks
• Automotive
• Under-hood components, interior assemblies, cable conduits
• Wire and cable
• Insulation layers, sheathing, jacketing materials
• Construction
• Plastic fittings, conduits, insulation panels
• Consumer appliances
• Enclosures, adapters, plugs, casings
• Industrial components
• Fiber-reinforced composites, flame-retardant masterbatches
• Compatible polymers
• PA6, PA66
• PBT, PET
• PE, PP
• Blends and copolymers requiring halogen-free flame retardancy
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