White Crystals D-CAMPHOR C10H16O CAS 464-49-3

Camphor is a granular crystal obtained from the branches, stems, leaves and roots of camphor plants. Camphor has the functions of clearing the orifice, promoting qi stagnation, relieving filth, killing insects and relieving pruritus, detumorizing and relieving pain, treating scabies pruritus, bruising pain, toothache and other symptoms. The main component is pure d-Camphora, a Camphoroid compound.

Camphor, evergreen tree, 20-30m high. Bark grayish brown

camphor

camphor

Or yellowish brown, longitudinally divided; Branchlets light brown, smooth; The branches and leaves have camphor flavor. Leaves alternate, leathery, ovate-elliptic to ovate, 6 -- 12 x 3 -- 6cm, apex acuminate, base obtuse or broadly cuneate, entire or undulate, dark green glossy above, gray-green or pinkish white below, glabrous, young leaves reddish, veins 3 above base, glands raised in axils; Petiole 2-3cm long. Panicles axillary; Flowers small, greenish-white or yellowish, ca. 2mm long; Perianth 6-lobed, elliptic, ca. 2mm long, inner surface densely pilose; Can produce stamens 9, anthers 4 cells; Ovary ovate, smooth glabrous, style short; Stigma capitate. Drupes globose, ca. 1cm wide, purplish black at ripening, base surrounded by persistent, enlarged perianth tubes. Flowering period from April to June. Fruiting period from August to November.

Camphor is refined from crude camphor. Crude camphor is usually processed in winter with more than 50 years old camphor tree trunk and roots as raw materials, cut into thin slices in rette water distillation, camphor and camphor oil with steam distillation, condensation of white crystal for camphor, oil liquid for camphor oil. The total rate is 2.0~2.5%. There are two methods for refining crude camphor: air sublimation and continuous fractionation sublimation. China mainly adopts the sublimation method of blowing air. The crude camphor is removed from the oil and water by centrifuge first, and then put into the sublimation pot for melting and sublimation. The camphor vapor is introduced into the first sublimation chamber with the air blown into the top of the pot, and the cooling temperature is controlled to obtain powdered crystalline products. Then enter the second and third distillation chamber, due to the low control temperature, the boiling point of water and oil below camphor with a small amount of camphor vapor condensed and crystallized here, as camphor crude (oil water above 8%), need to be refined by sublimation. Chinese natural refined camphor has two kinds of powder and block. Quality in accordance with the specifications of various countries' pharmacopoeia: melting point 174~179℃, specific curl [a] +41°~+43°(20% in ethanol), non-volatile matter below 0.05%, moisture in accordance with 1 gram plus petroleum ether 10 ml clarification and dissolution.

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