Overview
Alkanes are the simplest class of hydrocarbons, characterized by single bonds between carbon atoms and a general formula of CₙH₂ₙ₊₂. They form the basis of organic chemistry and are derived primarily from petroleum and natural gas. Alkanes are categorized by chain length: methane (C1) to hexadecane (C16) and beyond, with physical states ranging from gases (C1–C4) to liquids (C5–C17) and solids (C18+). Their saturated structure makes them relatively inert, though they undergo combustion and halogenation reactions. As nonpolar compounds, alkanes are hydrophobic and dissolve readily in organic solvents. Industrial production involves fractional distillation of crude oil or natural gas processing.
Physical and Chemical Properties
Alkanes exhibit predictable trends in physical properties based on molecular weight. Boiling and melting points increase with chain length due to stronger van der Waals forces. For example, methane (CH₄) is a gas at room temperature, while octane (C₈H₁₈) is a liquid, and paraffin wax (C₂₀H₄₂) is a solid. Density ranges from 0.6–0.8 g/cm³ for liquid alkanes. Chemically, alkanes are unreactive toward acids, bases, and oxidizing agents under standard conditions. However, they combust exothermically to produce CO₂ and water, making them valuable fuels. Halogenation reactions (e.g., chlorination) require UV light or heat to proceed.
Main Applications
Alkanes are indispensable in energy and manufacturing sectors. Short-chain alkanes (methane, propane, butane) serve as heating fuels and liquefied petroleum gas (LPG). Mid-chain alkanes (C5–C12) are refined into gasoline, while longer chains (C12–C18) are used in diesel and jet fuel. Waxy alkanes (C20+) form lubricants, candles, and polishes. In petrochemicals, alkanes are cracked to produce alkenes (e.g., ethylene) for plastics synthesis. They also act as solvents in pharmaceuticals and coatings. Specialty applications include methane in fertilizer production and hexane in food extraction.
Safety and Storage
Alkanes pose significant fire hazards due to their flammability. Methane and propane can form explosive mixtures with air (LEL/UEL: 5–15% and 2.1–9.5%, respectively). Storage areas must be well-ventilated, with no open flames or sparks. Use grounded containers to prevent static discharge. Personal protective equipment (PPE) like gloves and goggles is recommended when handling liquid alkanes, as they can irritate skin and eyes. Inhalation of high concentrations may cause dizziness or asphyxiation. Spills should be contained with absorbent materials and disposed of as hazardous waste.
B2B Procurement Guide
When sourcing alkanes, specify parameters such as chain length (e.g., hexane vs. heptane), purity (technical grade ≥95%, reagent grade ≥99%), and packaging (drums, ISO tanks). Prices fluctuate with crude oil markets; bulk purchases (20+ metric tons) often secure discounts. Verify supplier certifications (ISO 9001, REACH compliance) and request SDS for safety data. For specialty alkanes (e.g., n-hexane for HPLC), confirm residual solvent levels. Logistics should prioritize temperature control for volatile alkanes and avoid mixed loads with oxidizers.
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