Introduction: Heptane has nine isomers, with n-heptane [CH3(CH2)5CH3] being the most important. It is a colorless, flammable liquid. It is almost insoluble in water, slightly soluble in alcohol, and soluble in ether and chloroform. Its vapor forms explosive mixtures with air, with an explosion limit of 1.0–6.0% (by volume). It is separated from petroleum fractions. When burned in a cylinder, it explodes violently. Its octane number is defined as zero. Mixtures with isooctane (octane number defined as 100) in various proportions are commonly used as a standard for determining the octane number of gasoline.

Applications: Heptane is a typical nonpolar solvent, commonly used as a standard for determining octane numbers, an anesthetic, and a raw material for organic synthesis. It also has wide applications in the pharmaceutical, pesticide, rubber synthesis, chemical fiber synthesis, reagent, and electronic cleaning industries. n-Octane is used as a solvent and a standard substance for chromatographic analysis, and is also used in organic synthesis. With the rapid development of related industries such as chemicals, pharmaceuticals, and electronics, my country's demand for n-heptane will increase year by year, especially for high-purity n-heptane, which has broad market prospects.

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