① Cinnamomum camphora. Also known as Cinnamomum camphora, it is the most important tree species for extracting camphor and camphor oil. The components of camphor oil can be divided into three types: Cinnamomum camphora (mainly containing camphor), Cinnamomum camphora (mainly containing linalool) and Cinnamomum camphora (mainly containing cineole and terpineol). ② Cinnamomum camphora ③ Cinnamomum yunnanense

Camphor oil is mainly composed of terpenoids. Generally, refined camphor, various essential oils (such as eucalyptus oil, linalool, pine oil and safrole) and by-products (such as white camphor oil, red camphor oil and blue camphor oil) are prepared by multi-tower continuous vacuum distillation combined with freeze sublimation process.