Orange oil is a citrus essential oil containing d-Limonene along with other naturally occurring citrus compounds, while d-Limonene is the more concentrated and isolated terpene. Both are derived from citrus processing, but their composition makes them suitable for different applications. Orange oil is commonly valued for its aroma and versatility, while refined d-Limonene is often selected when specific solvent performance or greater chemical purity is required.

d-Limonene is a naturally occurring terpene found primarily in the peels of citrus fruits and widely used as a natural solvent, degreaser, and formulation ingredient. It is a major component of citrus essential oils and is valued for its strong solvency, recognizable citrus aroma, and renewable origin. Common applications include industrial and commercial cleaners, adhesive removers, personal care products, fragrances, and food applications when an appropriate grade is used.