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1-Chlorobutane belongs to the family of alkyl halides and carries the chemical formula C4H9Cl. This molecule brings together a straight four-carbon chain with a single chlorine atom attached to the first carbon position. The HS Code for 1-Chlorobutane is 2903.19, which places it under chlorinated alkanes within global trade and customs. The structure looks straightforward at first glance: a butyl group capped by chlorine, yet this arrangement leads to numerous uses in organic synthesis, industrial processing, and laboratory preparation. Most folks studying organic chemistry meet 1-Chlorobutane early on, since it stands out as a typical example for SN2 substitution reactions in textbooks and real-world applications. I’ve used it in the lab for producing various derivatives because its reactivity makes it a go-to raw material for building larger, more complex molecules.
In daily handling, 1-Chlorobutane appears as a clear, colorless liquid at room temperature. This liquid holds a density of about 0.886 g/cm3 at 20°C. Its boiling point sits at 78-78.5°C, which lands in the familiar range for small-chain chlorinated hydrocarbons. The material doesn’t present itself as flakes, powder, pearls, or crystals; purchasers will only see a mobile liquid pouring from a drum or bottle. Its mild, sweet odor reminds seasoned chemists of other halides, and you’ll notice its volatility as it evaporates quickly from an open surface. Water solubility stays negligible, barely reaching 0.09 g per 100 ml at 20°C, meaning it floats right on top of water in a classic separatory funnel demonstration.
Looking closer, the molecular structure features a linear chain: CH3-CH2-CH2-CH2Cl. This creates a simple, straight backbone that distinguishes it from its isomeric cousin, tert-chlorobutane. The clarity of this structure underpins how it behaves in reactions and why it’s chosen for specific synthetic tasks. Its molecular weight stands at 92.57 g/mol, providing a reliable figure for stoichiometry and process calculations. Synthetic chemists appreciate molecules with well-defined structures like 1-Chlorobutane, since predictability means fewer surprises in yield and purity.
Plenty of industries draw on 1-Chlorobutane as a raw material. In my own work, I’ve used it to prepare pharmaceuticals, agrochemicals, and even synthetic rubber intermediates. It acts as an alkylating agent, transferring its butyl group to other compounds during synthesis. Its flexible reactivity slots into Grignard reactions or acts as a building block for surfactants. Because it is readily available and relatively inexpensive compared to other alkyl halides, it finds its way into a broad set of manufacturing steps all over the world. In paint and coating industries, it’s part of resin formulations, where its chemical stability helps finished products resist environmental breakdown. This versatility makes it indispensable in production lines where consistent feedstock ensures high output and minimal waste.
Despite its wide utility, 1-Chlorobutane presents several safety concerns that should not get overlooked. The chemical’s vapors cause irritation in the respiratory tract, and direct contact can produce a burning sensation on the skin or eyes. The flash point hits around 2°C, so it quickly becomes flammable under ambient conditions. Storage calls for rigorous ventilation, spark prevention, and careful labeling, since accidental spills or leaks can threaten both worker safety and plant operations. Chronic exposure doesn’t raise alarms of carcinogenicity under typical workplace conditions, based on what’s known from toxicological databases. Still, routine use should always go hand in hand with gloves, goggles, and fume hoods—a combination that helped keep mishaps out of my own lab and many others. Waste disposal must follow legal frameworks because releases into waterways or sewers present both fire risks and environmental hazards.
Product purity plays a critical role in how 1-Chlorobutane can get used. Typical commercial preparations specify minimum purity above 99%, with trace moisture and other halogenated alkanes kept below very low thresholds. Purchasing from a reputable supplier usually means you receive a certificate stating exact composition, physical constants like density and refractive index, and assurance of batch consistency. This scrutiny pays off when the material becomes part of pharmaceuticals or high-performance polymers where contaminants can disrupt yields or compromise product safety. For storage, stainless steel or glass containers are preferred, since the liquid can react slowly with some plastics over time.
Dealing with hazardous chemicals in the manufacturing sector isn’t just about compliance—it’s about responsibility. There’s ongoing discussion among chemists and industry leaders around replacing volatile halogenated compounds with alternatives that carry less risk, both for workers and the environment. While some applications don’t have easy substitutes, innovations in green chemistry keep bringing new options to the table. Improved ventilation design, automated handling systems, and digital monitoring detect leaks more efficiently than older manual checks, cutting down risk. Training and ongoing education make a tangible difference. In my experience, the best safety practices come from persistent awareness and sharing past mistakes so that others don’t have to repeat them. As supply chains tighten and regulations grow stricter, companies benefit by developing transparent sourcing and robust tracking of raw materials like 1-Chlorobutane, which helps keep both users and end products safe.
