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Production process of menthol

A production process, menthol technology, applied in the field of menthol production process, can solve the problems of increasing menthol loss and waste, achieve the effects of good purity and quality, avoid waste, and high extraction rate

Inactive Publication Date: 2017-05-10
HUANGSHAN TIANMU MINT PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain menthol with higher purity, it is necessary to strictly control the crystallization conditions during the production of menthol, and undergo multiple crystallization and repeated removal of impurities, but this will increase the loss of menthol and cause waste

Method used

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  • Production process of menthol
  • Production process of menthol
  • Production process of menthol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Stand still: put the qualified peppermint crude oil in a static tank, keep the temperature at 40-60°C, keep the mint crude oil in a liquid state without freezing, and let it stand for 24 hours. After the standing is completed, separate the water and impurities at the bottom, and remove The water impurities in the raw materials are beneficial to freeze-out to obtain a purer product.

[0027] 2), one-time freeze-out: adopt the mixture of the mint crude oil and ice oil after standing, the ice oil is the mother liquor after the crystallization of the last batch of materials, and the mixing mass ratio of the mint crude oil and ice oil is 2:0.8, Put the mixed material into the freeze-out tank, feed low-temperature brine into the coil of the freeze-out tank, and turn on the frozen brine pump to cool down gradually, and the amount of brine pumped increases from small to large. When the temperature of the brine reaches -26 to -30°C, the refrigeration is stopped, and the brine...

Embodiment 2

[0036] 1) Stand still: put the qualified peppermint crude oil in a still tank, keep the temperature at 40-60°C, let stand for 23 hours, and separate the water and impurities at the bottom after the stand is completed.

[0037] 2), one-time freeze-out: adopt the mixture of mint crude oil and ice oil after standing, the mixing mass ratio of described mint crude oil and ice oil is 2:0.5, the material after mixing is input in the freeze-out tank, gradually cool down, By controlling the freeze-out temperature, the amount of secondary oil is 40% to 50% of the total mass of raw materials.

[0038] 3), secondary freeze-out: adopt the mixture of two parts oil and ice oil, the mixing mass ratio of described two parts oil and ice oil is 1:1, input two parts oil and ice oil mixture in the freeze-out tank, and The primary freeze-out is similar, and the amount of crude oil is 50% to 60% of the total mass of the secondary oil and ice oil by controlling the freeze-out temperature.

[0039] 4...

Embodiment 3

[0046] 1) Stand still: put the mint crude oil that has passed the inspection in a still tank, keep the temperature at 40-60°C, and let it stand still for 25 hours. After the standing is completed, the water and impurities at the bottom are separated.

[0047] 2), one-time freeze-out: adopt the mixture of mint crude oil and ice oil after standing, the mixing mass ratio of described peppermint crude oil and ice oil is 2:1, the material after mixing is input in the freeze-out tank, gradually cool down, By controlling the freeze-out temperature, the amount of secondary oil is 40% to 50% of the total mass of raw materials.

[0048] 3), secondary freeze-out: adopt the mixture of two parts oil and ice oil, the mixing mass ratio of described two parts oil and ice oil is 1:1.5, input two parts oil and ice oil mixture in the freeze-out tank, and Similar to the first freeze-out, the temperature is gradually lowered with frozen brine, and the amount of crude oil is 50% to 60% of the total...

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Abstract

The invention belongs to the technical field of chemical engineering and aims to provide a production process of menthol. By the production process of the menthol, waste can be reduced, and the purity and the quality are high. The production process comprises the steps of allowing standing still, freezing out for the first time, freezing out for the second time, dehydrating, filtering, dosing, crystallizing, baking the menthol and airing the menthol. Initial menthol oil and secondary oil are separated out through the step of freezing out for the first time; secondary menthol oil and crude oil are separated out through the step of freezing out for the second time; ice oil is separated out through the step of crystallization; menthol baking oil is separated out through the step of baking the menthol; menthol heads, menthol feet and menthol blocks are separated out through the step of airing the menthol and are heated and melted to form melted oil. The step of dosing is to mix dehydrated and filtered initial menthol oil, secondary menthol oil, ice oil, menthol baking oil and melted oil according to a proportion; the mixed oil is subjected to the steps of crystallizing, baking the menthol, airing the menthol and the like to finally separate the menthol with high purity and quality. By the production process of the menthol, products with high yield, purity and quality can be obtained, the loss of the menthol in the production process is reduced, and waste is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a menthol production process. Background technique [0002] Menthol is an active ingredient extracted from the stems and leaves of the traditional Chinese medicine Peppermint. It can not only be used as a flavoring agent for toothpaste, perfume, beverages and candies, but also as a medicine. Itching effect, taken orally for headache and inflammation of the nose, pharynx, larynx and other parts. Menthol can be extracted from natural mint crude oil, and can also be prepared by synthetic methods. The menthol extracted from mint crude oil better maintains the pure natural characteristics, but the extracted menthol often contains more impurities. In order to obtain menthol with higher purity, it is necessary to strictly control the crystallization conditions in the process of producing menthol, and undergo repeated crystallization and repeated removal of impurit...

Claims

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Application Information

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IPC IPC(8): C07C35/12C07C29/78C07C29/74
CPCC07C29/78C07C29/74C07C35/12
Inventor 方胜汪莉萍李祖岳
Owner HUANGSHAN TIANMU MINT PHARMA
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