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N-Butanol stands out among alcohols as a straight-chain, four-carbon chemical compound. Its chemical formula reads C4H9OH and the molecular weight clocks in at about 74.12 g/mol. In practical use, N-Butanol appears as a clear, colorless liquid, sometimes leaving a little sweetish aroma in the air. Used widely as a solvent, this liquid gets its structure from a single hydroxyl group attached neatly to the terminal carbon atom, making it part of the primary alcohol family.
Grab a liter of N-Butanol and you see it tip the scale with a density near 0.81 g/cm3 at 20°C. Pour it on a glass plate and it will evaporate, but not nearly as fast as acetone or ethanol. Its boiling point reaches around 117.7°C, so the vapor takes a bit longer to rise compared to similar solvents. A drop on the hand feels smooth and leaves a slight cooling sensation, nearly always a sign of old-school laboratory practice. N-Butanol does not form flakes, powder, or pearls under normal conditions. Its form stays stubbornly liquid at room temperature, only freezing into a solid at -89.8°C, well below what most chemical storage rooms ever see.
Each molecule of N-Butanol holds four neatly connected carbon atoms, with the hydroxyl group hugging the end. No surprise, its systematic name is 1-butanol, and that simple linear structure keeps things predictable during reactions. Industry references point to the HS Code 29051300 for N-Butanol, linking it directly to global trade under organic chemicals. Those digits matter in the world of import and export, as customs paperwork becomes a tangle without a clear code for such versatile materials.
Chemically, N-Butanol behaves like many alcohols but adds a heavier, oilier touch to the mix. It dissolves most organic compounds, and blends with common solvents like ether and methanol. Its slight polarity lets it form hydrogen bonds, but it won’t go out of its way to mix with water; its water solubility sits at about 7.7 g/100 mL at 20°C. Add it to solutions in the paint or varnish world and it helps the end product flow evenly or dry at a controlled pace. What sets it apart: a low freezing point and balanced reactivity, which lets it act as both a raw ingredient and a medium for other reactions.
In daily work, N-Butanol plays a behind-the-scenes role as a raw material for butyl acrylate, a backbone for paints and adhesives. It also pops up in the manufacturing of plasticizers, which keep PVC soft and flexible. Walk through a plant and you may smell that faint butyl aroma as drums of the substance get pumped for use in coatings, textiles, and resins. Its capacity to clean and dissolve stubborn residues also puts it on cleaning supplies and chemical formulations lists. Any chemical formulation job needing a solvent that resists water but mixes with oils often comes back to N-Butanol.
A bottle of N-Butanol demands some respect. Inhalation of high levels brings headaches or dizziness, while skin contact may cause mild irritation. Drinking even small amounts is hazardous and can damage organs. Disaster stories are rare, but only because chemists wear gloves, goggles, and work in ventilated hoods. Classified as a flammable liquid, N-Butanol can fuel a fire if spilled or stored near sparks. On the safety materials sheet, storage advice always points to cool, well-ventilated areas, away from open flames and oxidizing agents. The harmful effects come less from its chemical activity and more from its volatility—you see a spill, you mop it up fast.
Like most chemicals, challenges arise from scale and regulation more than chemistry itself. N-Butanol production relies on propylene, a petroleum product, so price swings on the global market hit bottom lines hard. A shortage anywhere in the raw materials chain—be it propylene, packaging, or transport—translates quickly into production slowdowns. Regulatory pressure grows every year, with calls for safer handling, proper labeling, and restricted emissions. Solutions lie in better worker training, stricter ventilation standards, and adopting process automation to minimize human exposure and waste. Some companies lean towards bio-based routes, using fermentation to make N-Butanol from renewable feedstocks. Although the cost runs higher, this approach cuts down on petroleum reliance and sends fewer greenhouse gases into the air. In the years ahead, balancing cost, efficiency, and sustainability will define how this chemical continues to shape industries.
