Method for extracting natural methoxy-4-methylphenol from dry distillation weeping cypress

Abstract

The invention provides a method for extracting natural methoxy-4-methylphenol from dry distillation weeping cypress. The method comprises the following steps: (1) extracting, namely, extracting vegetable oil which are obtained from weeping cypress by dry distillation, and separating phenolic compounds and alkene compounds from the vegetable oil to obtain crude phenols; (2) intermittent distillation under reduced pressure, namely, performing intermittent distillation under reduced pressure on the crude phenols obtained in the step (1) in a refining kettle, and collecting methoxy-4-methylphenolwith the content of 7 percent obtained in the kettle; (3) continuous distillation under reduced pressure, namely, performing continuous distillation under reduced pressure on the methoxy-4-methylphenol with the content of 7 percent obtained in the step (2) in a refining kettle, and collecting methoxy-4-methylphenol with the content of 99 percent obtained in the kettle. According to the method, crude methoxy-4-methylphenol is quickly distilled through intermittent distillation under reduced pressure and the methoxy-4-methylphenol is further refined by utilizing continuous distillation under reduced pressure in the mode of combining the intermittent distillation under reduced pressure and the continuous distillation under reduced pressure; the extracting precision is high; the product yieldis improved.

Description

technical field [0001] The invention belongs to the technical field of biological extraction, and in particular relates to a method for extracting natural 4-methylguaiacol from dry distilled cypress. Background technique [0002] Guaiacol is a white or light yellow clean or colorless to light yellow transparent oily liquid with a special aromatic smell, its scientific name is o-hydroxyanisole, glycerol ether, guaiacol glyceryl ether or o-hydroxyglycerol ether, etc. , which exists in guaiac wood resin, pine oil and hardwood retort oil in nature, is an important fine chemical intermediate, widely used in the synthesis of medicine, spices and dyes, natural guaiacol from needle-like trees such as cypress Dry distillation out of the distillate, extraction, purification obtained. [0003] However, the distillate contains various components such as α-pinene, β-pinene, cedarol, acetic acid phenol, guaiacol, 4-methylguaiacol, p-cresol and m-cresol, etc. The boiling points of these m...

AI Technical Summary

Problems solved by technology

[0003] However, the distillate contains various components such as α-pinene, β-pinene, cedarol, acetic acid phenol, guaiacol, 4-methylguaiacol, p-cresol and m-cresol, etc. The boiling points of these materials are close to each other. Separation is difficult, because olefins have unstable double bonds and are easily oxidatively added, so olefins and phenols can be separated first, but when phenols are distilled, the residence time of the materials in the reactor is too long , prone to aggregation resulting in low extraction efficiency