Method for extracting rose essential oil from fresh rose flowers

Abstract

The invention discloses a method for extracting rose essential oil from fresh rose flowers, which relates to a method for spice extraction, in particular to a method for extracting rose essential oil from fresh rose flowers by using the organic solvent extraction and molecular distillation technology. The method comprises the following steps: carrying out lixiviation on fresh floribunda rose flowers by petroleum ethers, then sequentially carrying out filtration, dewaxing and concentration on the obtained product so as to obtain a first concentrated solution; carrying out lixiviation on the rose flower residues subjected to four times of lixiviation by an equivalent petroleum ether / dichloromethane mixed solvent, then sequentially carrying out filtration, dewaxing and concentration on the obtained product so as to obtain a second concentrated solution; mixing the first concentrated solution with the second concentrated solution, then adding the obtained mixture into a molecular distillation device so as to distill the mixture, thereby removing residual solvents, vegetable waxes, pigments and the like in absolute rose oil, and finally, obtaining the rose essential oil. The prepared rose essential oil is pure in aroma and clear in color and luster, the oil yield of the fresh rose flower reaches 0.1 percent, which is 3.3 times of the oil yield of the fresh rose flower through steam distillation.

Description

technical field [0001] The invention belongs to a fragrance extraction method, in particular to a method for extracting rose essential oil from rose flowers by using organic solvent extraction and molecular distillation techniques. Background technique [0002] Pingyin County, Shandong Province is the hometown of roses in China. Pingyin roses are the representative of traditional Chinese roses. The planting area of ​​roses has reached 30,000 mu. At present, rose essential oil is usually produced by steam distillation. The advantage is that the investment in equipment is small. It is easy to operate, and the quality of rose essential oil is good. The disadvantage is that the oil yield is low, only 3 / 10,000; carbon dioxide supercritical and molecular distillation technology is used to produce rose essential oil. Due to the high pressure and pre-treatment, the low molecular components of rose essential oil are lost. , some chemical components in rose essential oil are also pron...

AI Technical Summary

Problems solved by technology

[0002] Pingyin County, Shandong Province is the hometown of roses in China. Pingyin roses are the representative of traditional Chinese roses. The planting area of ​​roses has reached 30,000 mu. At present, rose essential oil is usually produced by steam distillation. The advantage is that the investment in equipment is small, It is easy to operate, and the quality of rose essential oil is good. The disadvantage is that the oil yield is low, only 3 / 10,000; carbon dioxide supercritical and molecular distillation technology is used to produce rose essential oil. Due to the high pressure and pre-treatment, the low molecular components of rose essential oil are lost. , some chemical components in rose essential oil are also prone to change, and the investment in equipment is large, the risk is high, and it is not easy to achieve large-scale production; organic solvent extraction can only produce rose extract and rose absolute, and rose extract at room temperature It is solid, which contains a large amount of vegetable wax and pigment; rose absolute is obtained by removing vegetable wax from rose extract, which contains a small amount of vegetable wax, pigment and other organic substances

Both rose extract and rose absolute contain organic solvent residues, which affect their fragrance and application range

The above methods of extracting rose essential oil from rose flowers are not very ideal

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