Overview
N-Alkanes are saturated hydrocarbons consisting solely of carbon and hydrogen atoms arranged in straight chains. They are the simplest organic compounds and form the backbone of organic chemistry. These compounds are naturally abundant in petroleum and natural gas, from which they are industrially extracted. Their non-polar nature and lack of functional groups make them chemically inert under normal conditions, though they combust readily. The physical properties of n-alkanes vary systematically with chain length, transitioning from gases (C1–C4) to liquids (C5–C17) to waxy solids (C18+).
Physical and Chemical Properties
N-alkanes exhibit predictable trends in physical properties: boiling points increase by approximately 25–30°C per added carbon atom due to stronger London dispersion forces. Melting points show similar trends but with odd-even alternation effects in shorter chains. Their density remains below water (0.63–0.80 g/cm³ for liquids). Chemically, n-alkanes are unreactive toward acids, bases, and oxidizing agents at room temperature. They undergo free-radical substitution reactions (e.g., halogenation) and complete combustion to carbon dioxide and water. The lack of branching distinguishes them from isoalkanes, affecting properties like octane rating and biodegradability.
Main Applications
As fuel components, shorter n-alkanes (C5–C12) constitute gasoline, while longer chains (C12–C20) serve as diesel and jet fuel. In petrochemicals, they are cracked to produce olefins or reformed into aromatic compounds. Specialty applications include paraffin waxes (C20–C40) for candles and coatings. Industrial uses extend to lubricants (white oils), solvents (hexane, heptane), and mold-release agents. In laboratories, high-purity n-alkanes serve as standards for chromatography and calorimetry. Emerging applications include phase-change materials for thermal energy storage and template molecules in nanomaterials synthesis.
Safety and Storage
Flammability is the primary hazard: lower n-alkanes form explosive mixtures with air (methane LEL 5%). Proper grounding is essential to prevent static discharge during transfer. Skin contact with liquid alkanes may cause defatting dermatitis, while inhalation of vapors can lead to central nervous system depression. Storage requires steel drums or tanks with pressure relief for volatile species. Oxidizers must be segregated. For large quantities, secondary containment is recommended to prevent soil contamination. Shelf life is indefinite if containers remain sealed to prevent evaporation or contamination.
B2B Procurement Guide
Industrial buyers should specify carbon number range (e.g., C10–C13), purity (technical, 95%, 99+%), and additives (e.g., antioxidants). Bulk shipments (tank trucks, ISO containers) offer cost savings for large consumers, while drummed quantities suit smaller operations. Quality verification typically involves gas chromatography for chain-length distribution and tests for sulfur/water content. Major producers include petroleum refiners and specialty chemical manufacturers. Regional availability varies—shorter alkanes are often sourced from natural gas processing, longer chains from petroleum distillation.
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