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Method for extracting neroli absolute by supercritical carbon dioxide

A technology of carbon dioxide and neroli purification, applied in the field of separation and purification of plant active ingredients, can solve the problems of poor aroma, low yield, dark color, etc., and achieve the effect of simple process flow, high product yield and low temperature

Inactive Publication Date: 2012-05-02
重庆市海昆化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are poor aroma, darker color, lower yield, and residual organic solvents that have adverse effects on the human body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The steps are as follows: (1) freeze-dry 2000 grams of fresh orange blossoms at a temperature of -5°C, grind them to a fineness of 40 meshes with a pulverizer, and put them into an extraction kettle; (2) inject carbon dioxide at a flow rate of 20 L / h, Carry out the first extraction at 30°C and a pressure of 12MPa for 2 hours to obtain orange blossom extract; (3) Boost the pressure of the extraction kettle to 25MPa and keep the temperature at 50°C for the second extraction for 4.5 hours , to obtain the second extract; (4) combine the two extracts, mix them evenly, put them into a molecular still, and separate and remove the waxy components at a vacuum of 50KPa and a temperature of 30°C to obtain neroli absolute 4.1 g, the net oil yield is 0.205%.

Embodiment 2

[0014] The steps are as follows: (1) freeze-dry 2000 grams of fresh orange blossoms at a temperature of -35°C, pulverize them to a fineness of 30 meshes with a pulverizer, and put them into an extraction kettle; (2) inject carbon dioxide at a flow rate of 25 L / h, and Carry out the first extraction at a temperature of 35°C and a pressure of 18MPa for 3 hours to obtain the orange blossom extract; (3) boost the pressure of the extraction kettle to 30MPa and keep the temperature at 48°C for the second extraction for 5 hours , to obtain the second extract; (4) combine the two extracts, mix them evenly, put them into a molecular still, and separate and remove the waxy components at a vacuum of 70KPa and a temperature of 60°C to obtain neroli absolute 4.35 grams, the net oil yield is 0.218%.

Embodiment 3

[0016] The steps are the same as in Example 1, except that the temperatures of the first and second extractions are respectively 33° C. and 55° C. to obtain 4.3 grams of neroli absolute, with an absolute yield of 0.215%.

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Abstract

The invention provides a method for extracting neroli absolute by supercritical carbon dioxide in combination with molecular distillation, and is characterized in that fresh orange blossoms are frozen and dried firstly, and then placed in an extraction kettle after being ground by a grinder; extraction are carried out twice under different temperatures and pressures, and extracts are merged, mixed and placed in a molecular still for separating and removing waxy component so as to obtain the neroli absolute. The invention has good extracting effect, high product yield, and low temperature in extraction separation process, thereby avoiding damages to aroma components due to high temperature without organic solvent residue, keeping pure natural performance of the neroli absolute, having convenient operation, and being applied to industrial production.

Description

technical field [0001] The invention relates to the separation and purification of plant effective components, in particular to a method for extracting neroli absolute contained in fresh neroli with supercritical carbon dioxide. Background technique [0002] Neroli is a precious natural fragrance, and its active ingredient, neroli absolute, is used as a high-grade fragrance raw material in various daily chemical products and foods. The existing method for extracting neroli absolute is to extract fresh neroli with petroleum ether to make neroli extract, add 5 to 10 times of ethanol, cool and filter to remove insoluble wax, and then cool to -18°C. Then filter to remove wax; the ethanol solution is distilled under reduced pressure to remove ethanol, and the absolute oil is obtained. The disadvantages of this method are poor aroma, darker color, lower yield, and residual organic solvents that have adverse effects on the human body. Contents of the invention [0003] Aiming a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11B9/02
Inventor 巫建国李廷荣万佳谭群
Owner 重庆市海昆化工有限公司