How to extract rose essential oil

Rose essential oil is a very good skin care product, and it can also adjust female endocrine, nourish the uterus and relieve dysmenorrhea. As a woman, everyone wants their skin to become better, and the effect of rose essential oil in this regard is quite obvious. Rose essential oil is very expensive, which makes many women reluctant to buy it. This is related to its extraction method. So, how to extract rose essential oil? Let’s take a look below.

Soak the roses in 15% salt permanently. On the one hand, it will prevent the roses from rotting and deteriorating, and on the other hand, it will allow the oil in the flowers to diffuse out.

Distillation

Put 30kg of rose flowers soaked in brine and 60kg of brine into a distillation flask and perform atmospheric distillation. The kettle temperature is controlled at 105°C to 106°C; the temperature of the distillate after condensation is 28°C to 36°C. The distillation can be stopped when the distillate has no aroma or when no oil drops appear when the condensate is dropped on a glass plate.

After the distillate flows through the oil-water separator, the water-insoluble part of the rose is concentrated and floats on the upper part of the separator. After one day and one night, it is taken out with a mesh spoon and collected in a ground glass bottle; it is reserved for centralized refining.

Adsorption

The distillate flowing out of the separator is adsorbed by three adsorption columns filled with activated carbon connected in series. After the activated carbon is saturated with essential oil, remove the first column and put the activated carbon collector in a sealed glass container for evaporation: then move the adsorption column forward and place the adsorption column containing fresh activated carbon in the second position.

Extraction

The activated carbon is extracted with an organic solvent. Soak for 4 to 6 hours for the first time, and 2 hours each time thereafter, for a total of 12 times. After the oil in the activated carbon is extracted, the organic solvent is evaporated and can be recycled.

The immersion wave is distilled by the distillation method of flammable solvents, and the water bath temperature is controlled below 60 degrees.

Vacuum azeotropic distillation

Add pure ethanol and carry out azeotropic distillation under reduced pressure on the crude distillation residue. The vacuum degree is 99.3kPa; the water bath temperature is ≤60 degrees. The product after distillation is further refined to become rose essential oil.