Menthol and peppermint oil purification process

A technology of peppermint oil and menthol, which is applied in the separation/purification of hydroxyl compounds, essential oils/flavors, and fat production, etc., can solve the problem of poor quality of broken small grains, unsatisfactory performance of crystal length and thickness, and differences in crystal shape, etc. problem to avoid errors
CN107778142AActive Publication Date: 2018-03-09ANHUI YINFENG PHARMA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ANHUI YINFENG PHARMA
Publication Date
2018-03-09

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Abstract

The invention discloses a menthol and peppermint oil purification process which comprises the procedures of raw material heating and melting, primary dehydrating under decompression, dispensing, primary filtering, crystallization, solid-liquid separation, menthol drying, rectification and the like. In the first to fifth days after crystal oil feeding, cooling and heat preservation of a crystallization vat are alternately performed, cold brine cooling is started every day to reach 25-28 DEG C, heat preservation is performed for 8-10 hours, cold brine cooling is stopped, the crystallization vatis subjected to heat preservation to the second day, and cold brine cooling is started again. In the sixth to twelfth days, cold brine is normally open, and the temperature is reduced by 1.8 to 2.3 DEG C every day. In the thirteenth to twentieth days, the cold brine is normally open, the temperature is reduced by 2.7 to 3.2 DEG C every day, and heat preservation is performed until the temperatureis reduced to 0 DEG C. The content of isomenthol in menthol melting oil crystallized by the slow cooling process is lower than 0.5%, menthol crystals are higher in purity, and the obtained crystals are sturdy and uniform in length, thickness and shape.
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Description

technical field

[0001] The invention relates to the technical field of natural medicine purification, in particular to a purification process of menthol and mint oil. Background technique

[0002] Menthol, also known as menthol, is colorless needle-like crystals or granules. Menthol oil refers to the volatile oil of peppermint that removes most of the menthol through cold analysis. After component analysis, it contains terpenes, limonene, menthone, menthol, pulegol and menthyl acetate. Esters etc. The raw materials for the production of menthol and peppermint oil are peppermint crude oil. The steps of separating menthol from mint crude oil in the prior art are as disclosed in CN 103274901 A, which includes steps such as melting, dehydration, batching, impurity removal, rectification and crystallization, brain drying, brain drying, packaging and storage, etc. And the purification of mint oil is as described in the content disclosed in CN106619807A, obtained by freeze-out se...

Claims

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