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Superhigh-pressure crystallization separation method of L-menthol from peppermint oil

A crystallization separation, menthol technology, applied in the separation/purification of hydroxyl compounds, organic chemistry, etc., can solve the problem of time-consuming

Active Publication Date: 2013-09-04
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at providing a fast, energy-saving and high-efficiency crystallization method for L-menthol (for the convenience of description, hereinafter referred to as menthol) traditional crystallization method takes a long time and other defects

Method used

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  • Superhigh-pressure crystallization separation method of L-menthol from peppermint oil

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Embodiment Construction

[0022] 1. Use peppermint oil containing 80% menthol as raw material, seal it in a soft package and put it into an ultra-high pressure container at a temperature of 20°C and a pressure of 300MPa, and keep the pressure for 30 minutes. 99.5% menthol crystals, 65% menthol content in the filtrate.

[0023] 2. Using peppermint oil containing 65% menthol as the raw material, the operation is the same as in Example 1, the temperature is 0°C, the pressure is 400MPa, and the pressure is kept for 1.5h. After the pressure is released, mixed crystals are obtained. After the mixed crystals are filtered, the purity of 99.5% can be obtained. Menthol crystals, 55% menthol content in the filtrate.

[0024] 3. Using peppermint oil containing 55% menthol as raw material, the operation is the same as in Example 1, temperature -20°C, pressure 400MPa, pressure-holding for 2 hours, after pressure relief, mixed crystals are obtained, and the mixed crystals are squeezed and filtered to obtain 99.5% pur...

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Abstract

A superhigh-pressure crystallization separation method of L-menthol from peppermint oil is provided. In the method, the peppermint oil is used as a raw material, and the method comprises crystallization and separation. The method is characterized in that: a pressure of 100 to 700MPa is applied to the peppermint oil in a superhigh-pressure vessel, and is kept for 0.25-2 hours at a temperature below 42 DEG C; ice-sand like mixed crystals of the L-menthol are obtained after pressure relief; L-menthol crystals are obtained through squeezing filtration of the mixed crystals. The L-menthol purity in the crystals is up to 99.5%. Through use of the method, selective crystallization, according to L-menthol content in the peppermint oil, and different requirements of L-menthol inventory level in a mother liquid of the peppermint oil, can be realized.

Description

1. Technical field [0001] The invention relates to a crystallization separation method, in particular to a method for ultrahigh pressure crystallization separation of L-menthol from peppermint oil. 2. Background technology [0002] Menthol (also known as menthol) is a natural or synthetic monocyclic monoterpene alcohol organic compound with menthane as the backbone carbon frame, colorless needle-like crystals or granular; melting point 42 ~ 43 ° C; The main components in peppermint essential oil exist in free and ester states. The standard chemical formula is as follows: [0003] [0004] Natural menthol is L-menthol, or L-menthol, which is the main component of peppermint oil. L-menthol has a mint aroma and a cooling effect, and can be used as a flavoring agent for toothpaste, perfume, beverages and candies. It is used as a stimulant in medicine, acting on the skin or mucous membranes, and has the effects of cooling, relieving itching, and refreshing the brain; it can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C35/12C07C29/74C07C29/78
Inventor 潘见孙艳辉张慧娟袁野张文成
Owner 潘见
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