Preparation method of flake crystalline solid natural borneol

Abstract

The invention discloses a method for preparing flaky crystalline natural borneol. The method comprises the following technical steps: (1) taking fresh camphor branches and leaves as raw materials; (2) putting the raw materials into a distiller for distillation; (3) cooling and collecting distilled crude borneol oil; (4) centrifuging and separating the crude borneol oil so as to obtain solid crude borneol and crude borneol oil liquid; (5) freezing the crude borneol oil liquid; (6) centrifuging and separating freezing liquid again so as to obtain the solid crude borneol and byproduct liquid oil; (7) dissolving the solid crude borneol in a dissolution kettle taking petroleum ether as a solution; (8) filtering dissolving liquid so as to remove impurities; (9) freezing and crystallizing a filtered solution; and (10) filtering and separating the freezing liquid and airing separated natural borneol so as to obtain a natural borneol product. The product is the flaky crystalline natural borneol with the natural d-borneol content over 98 percent, and is more than 1.5 times of powdered crystalline natural borneol in the selling price, thereby having good economic benefit.

Description

technical field [0001] The invention relates to a method for preparing natural borneol, in particular to a method for preparing natural borneol with flaky crystals. Background technique [0002] Natural borneol, also known as natural dextrorotary borneol and plum slices, was originally named "borneol fragrant" and was first recorded in "Tang Materia Medica". According to "Compendium of Materia Medica", it is named for its mica-like shape and snow-like color. Natural borneol is a traditional precious Chinese medicinal material and high-grade spice in my country, an important drug for preparing Chinese patent medicines, and a high-grade additive in daily chemical and food industries. Natural borneol originates in the South Sea Islands and is extracted from the resin of a dipterocarp tree (Dryobalanops aromatica Gaertn.f.). There are no dipterocarp resources in my country. Therefore, natural borneol mainly depends on imports. Because before 2004, my country has no national p...