Rose essential oil processing production line

Release Date:

2025-11-11 14:43

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Rose essential oil processing production line

Rose essential oil is the essence of the rose flower, often referred to as “liquid gold.” It contains hundreds of chemical compounds and is one of the world’s most precious, high‑grade concentrated fragrances, with a value several to over ten times that of gold. So how is rose essential oil extracted? Here are several methods used to obtain it.

1. Steam distillation

Steam distillation involves heating water together with rose petals; under the action of steam, essential oil constituents such as terpenes, alcohols, and lipids are co‑distilled from the petals. Taking advantage of the volatility of these compounds, their poor solubility in water, and their non‑reactivity with water, the vapor is condensed and collected, yielding rose essential oil. This method requires relatively large equipment, allows for the efficient processing of roses harvested during their short blooming period, and features a low‑cost, straightforward extraction process, making it the primary technique for obtaining rose essential oil. Its drawbacks include a low oil yield and the difficulty of extracting aromatic compounds with higher boiling points.

2. Extraction of Rose Essential Oil by Solvent Extraction

Traditional solvent extraction typically involves mixing a solvent with plant material to carry out the extraction, followed by filtration. The solvent is then evaporated to concentrate the extract, yielding a thick extract known as an oleoresin (a mixture of wax and essential oil). This oleoresin is dissolved in ethanol, and the solution is filtered at low temperature to remove impurities. Finally, the ethanol is evaporated to obtain pure rose absolute. By employing solvent extraction to isolate natural rose fragrance from rose flowers, the yield of the fragrance is significantly increased. The recovery rate of rose essential oil reaches 0.1–0.2%; however, this method suffers from high costs, complex processing, and residual solvent in the extracted material.

3 Subcritical Extraction Method

Subcritical fluid extraction is a novel extraction and separation technique that employs subcritical fluids as the extracting agent. Within a sealed, oxygen‑free, low‑pressure vessel, it leverages the principle of “like dissolves like” to facilitate molecular diffusion between the feed material and the extractant during the soaking process. This enables lipid‑soluble constituents from the solid matrix to transfer into the liquid extractant. Subsequently, the extractant is separated from the target product via vacuum evaporation, yielding the desired compound. Compared with other separation methods, subcritical fluid extraction offers numerous advantages: it is a non‑thermal process; it preserves the bioactive components of the extract without degradation or oxidation; it delivers high throughput and is amenable to large‑scale industrial production; it is energy‑efficient with low operating costs; and it allows for facile product–extractant separation.

4. Supercritical CO2 Extraction Method

By exploiting the unique solvating power of fluids at their critical temperature and pressure, compounds can be extracted and separated. Carbon dioxide, with its moderate critical conditions, is frequently employed as a supercritical fluid. Under high pressure, CO₂ exists in the liquid phase and, owing to its inertness and safety, is used for extracting aromatic compounds; at ambient temperature and pressure, liquid CO₂ transitions to gas, leaving no solvent residues. Using supercritical CO₂ extraction to isolate rose essential oil offers advantages such as low extraction temperatures, minimal loss of bioactive constituents, high product purity, and the absence of organic solvent residues. However, due to the limited capacity of processing equipment and the bulky nature of rose flowers—resulting in small batch sizes—the method has not been widely adopted for rose‑oil production.

Guangzhou Maiko specializes in the research and development of a wide range of extraction equipment, operating a 30,000-square-meter factory and R&D center. As a national high-tech enterprise, it offers custom-designed, non-standard extraction equipment tailored to specific client needs, as well as EPC turnkey solutions for traditional Chinese medicine extraction production lines. Its plant‑based extraction lines can produce finished products such as essential oils and concentrated herbal extracts.

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