Overview
n-Heptane is a hydrocarbon solvent belonging to the alkane family, consisting of seven carbon atoms in a straight chain. It is a clear, colorless liquid with a gasoline-like odor. As a major component of gasoline, n-heptane serves as a key reference compound for octane rating measurements (0 octane rating). Industrially produced through petroleum refining, it is valued for its non-polar solvent properties and relatively low toxicity compared to aromatic solvents. The '国产国标' designation indicates it meets Chinese national standards for purity and quality parameters.
Physical and Chemical Properties
With a boiling point of 98.4°C and flash point of -4°C, n-heptane exhibits typical alkane characteristics: low viscosity, high volatility, and excellent lipid solubility. Its vapor density (3.45, air=1) means vapors accumulate near ground level, requiring special ventilation considerations. The compound shows remarkable chemical stability under normal conditions, resisting reactions with acids, bases, and oxidizing agents. However, it forms explosive mixtures with air at concentrations between 1.1-6.7% by volume. Auto-ignition occurs at 204°C, necessitating careful handling near heat sources.
Main Applications
In laboratories, n-heptane serves as a primary solvent for UV spectroscopy due to its minimal UV absorption. It's indispensable for pesticide residue analysis and polymer testing where non-polar media are required. The automotive industry uses it as a knock-test reference fuel and cleaning agent for engine components. Industrial applications include adhesive formulation (particularly rubber cements), paint thinner production, and extraction processes for vegetable oils. Recent pharmaceutical applications utilize its azeotropic properties for drug purification. Manufacturers of electronic components employ n-heptane for flux removal and circuit board cleaning.
Safety and Storage
As a Category 2 flammable liquid under GHS classification, n-heptane requires storage in approved safety cans or flammable liquid cabinets. Grounding and bonding procedures are mandatory during transfer to prevent static discharge ignition. NFPA ratings include Health: 1, Flammability: 3, Instability: 0. Personnel handling n-heptane should wear chemical-resistant gloves (nitrile or neoprene recommended) and splash goggles. Spill containment should use inert absorbents like vermiculite, never combustible materials. Fire suppression requires alcohol-resistant foam, CO2, or dry chemical extinguishers - water spray may be ineffective.
B2B Procurement Guide
Bulk purchasers should specify required purity grades: industrial grade (95%+), reagent grade (98%+), or HPLC grade (99%+). Packaging options range from 200L steel drums (net ~150kg) to ISO tank containers for metric ton quantities. Key quality indicators include evaporation residue (<0.002%) and water content (<0.02%). Procurement contracts should address: batch COA availability, SDS compliance with destination country regulations, and transportation classification (UN1206, Class 3). For Chinese domestic purchases, verify GB/T 679-2002 standard compliance. Just-in-time delivery scheduling is recommended due to flammable storage constraints.
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