Clove Buds Oil Distillation Plant
Spice Oil Distillation Plants

Clove Buds Oil Distillation Plant

Clove Buds Oil Distillation Plant

Clove Buds Oil Distillation Plant

Clove bud (Syzygium aromaticum) essential oil is one of the highest-yielding commercial spice oils, delivering 15–20% oil from dried flower buds with eugenol content of 72–90%. Eugenol is a phenylpropanoid of exceptional commercial importance: it is the active ingredient in dental anaesthetics, an antimicrobial used in food preservation, a key fragrance chemical for clove-type perfumes, and a pharmaceutical intermediate. India is one of the world's largest importers and processors of clove buds from Indonesia, Madagascar, and Tanzania. Mechotech manufactures industrial-scale clove bud oil distillation plants designed for high-eugenol-yield production with full pharmaceutical and food-grade compliance.

Mechotech's clove bud oil distillation plants are engineered for steam distillation of Syzygium aromaticum dried flower buds (clove buds), achieving oil yields of 15–20% and eugenol content of 72–90%. The plant features a SS 316L still pot with a perforated false bottom, live steam injection at 0.5–1.5 bar, a large-area shell-and-tube condenser, and a Florentine flask with dual-port design for dense oil separation. Critically, clove bud oil is heavier than water (specific gravity 1.038–1.060), so it sinks to the bottom of the Florentine flask, requiring a bottom-draw design distinct from lighter oils. Clove oil's high eugenol content makes it strongly corrosive to standard carbon steel; all wetted surfaces must be SS 316L. Batch capacities range from 200 kg to 3,000 kg of dry clove buds per cycle.

Manufacturing Process

1

Raw Material Preparation

Dried clove buds (moisture ≤ 12%) are cleaned to remove stalks, dust, and damaged buds using a vibratory screen. Clove buds are generally distilled whole; crushing is not required as the high oil content (15–20%) in the bud exudes freely under steam. However, lightly bruising buds improves initial oil flow rate and reduces required distillation time for large batches.

2

Loading the Still

Cleaned clove buds are charged into the SS 316L still pot and distributed evenly over the perforated false bottom. Given the high oil content, the still pot is packed at controlled density to allow uniform steam penetration without creating channels. The vessel is sealed and connected to the steam supply. Hydro-distillation is also possible for small-scale operations.

3

Steam Distillation

Live steam at 0.5–1.5 bar is injected below the false bottom and passes through the clove bud bed, efficiently volatilising eugenol, eugenyl acetate, and β-caryophyllene. Distillation is typically complete in 2–4 hours at still temperatures of 100–108 °C, reflecting the high oil content and ease of volatilisation of eugenol. The high oil yield results in a visibly rich oil-water condensate mixture throughout the run.

4

Condensation

The vapour mixture of steam and clove oil enters the shell-and-tube condenser through an insulated dome. The condenser is sized for the high oil-vapour load generated from clove bud distillation — significantly higher per unit weight of raw material compared to other spices. Cooling water circulates counter-currently, condensing the vapour at 30–40 °C to a liquid mixture of clove oil and hydrosol.

5

Oil-Water Separation

This step is critical and differs from most spice oils: clove bud oil is denser than water (specific gravity 1.038–1.060) and sinks to the bottom of the Florentine flask. Mechotech's bottom-draw Florentine flask design draws dense clove oil from a lower port, while hydrosol overflows from the top. This reverse-separation Florentine flask is a key engineering feature of Mechotech's clove oil plant.

6

Quality Testing & Packing

Clove bud oil is tested for specific gravity (1.038–1.060 at 25 °C), refractive index (1.527–1.535), eugenol content (72–90% by GC-MS), eugenyl acetate content, optical rotation (−1.5° to 0°), and organoleptic profile. Compliant oil is filled into amber glass bottles or food-grade aluminium containers under nitrogen blanket. Eugenol content certificate is required by pharmaceutical buyers.

Applications

  • Dental anaesthetics — eugenol as the primary active ingredient in zinc oxide eugenol (ZOE) dental cements and cavity preparations
  • Food flavouring — clove oil in baked goods, meat products, beverages, and pickling spices
  • Fragrance and perfumery — clove-type oriental and spicy fragrances in fine perfumery and soaps
  • Pharmaceutical — antiseptic, analgesic, and antimicrobial formulations in OTC and prescription medicines
  • Food preservation — natural antimicrobial and antifungal preservative in packaged foods
  • Eugenol isolation — industrial-scale eugenol separation for further chemical synthesis
  • Aromatherapy — warming, stimulating massage and diffusion blends

Key Features

  • Bottom-Draw Florentine Flask for Dense Oil

    Clove bud oil (specific gravity 1.038–1.060) is heavier than water and sinks to the bottom of the separator. Mechotech's reverse-separation Florentine flask design with a bottom oil draw port and top hydrosol overflow is specifically engineered for dense essential oils, ensuring clean separation without oil contamination of the hydrosol stream.

  • High Eugenol Yield

    Optimised steam flow rate and distillation parameters deliver 95–98% eugenol extraction efficiency from each batch of dried clove buds, consistently achieving 15–20% oil yield with eugenol content of 72–90% meeting pharmacopoeia and food industry specifications.

  • Full SS 316L Corrosion Resistance

    Eugenol is a phenol with significant corrosive potential toward carbon steel and mild steel. All product-contact surfaces — still pot, condenser tubes, Florentine flask, and product piping — are fabricated from SS 316L, the only appropriate construction material for sustained eugenol-rich condensate service.

  • Large-Capacity Condenser

    The exceptionally high oil yield from clove buds (15–20%) generates a proportionally rich vapour stream. Mechotech sizes the condenser to handle this heavy vapour load efficiently without carryover, maintaining condensate temperature at 30–40 °C throughout the run.

  • Multi-Part Distillation

    The plant can be configured to collect early-run (eugenyl acetate-rich), middle-run (eugenol-rich), and late-run (β-caryophyllene-rich) fractions separately for buyers requiring specific composition profiles for pharmaceutical or fragrance applications.

Frequently Asked Questions

What is the expected oil yield from clove buds?
Dried clove buds (Syzygium aromaticum, moisture ≤ 12%) yield 15–20% essential oil by weight, making clove one of the highest-yielding commercial spice oils. Clove stems yield 5–7% oil (with higher β-caryophyllene content) and clove leaves yield 2–4% oil (also high eugenol but different composition). Mechotech plants can process buds, stems, and leaves.
Why does clove oil require a different separator than other spice oils?
Clove bud oil has a specific gravity of 1.038–1.060 at 25 °C, making it denser than water (specific gravity 1.000). Most essential oils are lighter than water and float in a Florentine flask. Clove oil, like cinnamon oil and some other phenol-rich oils, sinks to the bottom. Mechotech's reverse-design Florentine flask draws oil from the bottom port and allows hydrosol to overflow from the top, ensuring clean separation.
How long does clove bud distillation take?
Due to the exceptionally high oil content of clove buds (15–20%), distillation is relatively fast: 2–4 hours of active distillation. Most of the eugenol distils in the first 2 hours. Total cycle time including loading, heat-up, distillation, and discharge is 4–6 hours per batch. This high throughput efficiency makes clove oil distillation economically attractive.
Can the same plant distil clove stems and clove leaves in addition to buds?
Yes. Clove stems and leaves can be distilled on the same plant. Clove leaf oil (2–4% yield, eugenol 82–88%) and clove stem oil (5–7% yield, eugenol 89–95%) also produce denser-than-water oils requiring the same bottom-draw Florentine flask design. The still pot loading configuration may need adjustment for the lower bulk density of leaves versus buds.

Ready to discuss your project?

Get a free quote and technical consultation from our engineering team.

Get A Free Quote
★Review Us