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Essential Oil Distillation Plants
Essential Oils, Spices & Oleoresins

Essential Oil Distillation Plants

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Two stainless-steel stills with inclined condensers on a steel frame, an essential-oil distillation unit

Essential Oil Distillation Plants

An essential oil plant is sized by what is put in the still and what is wanted out. The processor has to decide which aromatic crop is distilled (leaf, flower, bark, root, seed or peel), whether it arrives fresh, wilted or dried, how much goes into each batch, and which oil quality the buyer will test for. Lemongrass, eucalyptus, clove, geranium and ylang-ylang are examples of distilled crops. Steam, hydro, vacuum and pressure distillation, and cold-press extraction for citrus peel, are the routes covered here, all for commercial output rather than small-batch use.

The route is chosen from how the oil behaves: how volatile it is, how well it tolerates heat and how the crop packs in the still. The plant couples the still to a condenser and a stainless-steel Florentine flask that separates oil from hydrosol. Steam can come from a boiler burning local fuel such as wood or crop residue, and the spent plant material is often used as boiler fuel too. Wetted parts are SS 316L, with PLC-based automation and clean-in-place washing between batches, which matters when one still handles several crops in turn. Supply scope, including whether the plant is commissioned as a turnkey system, is set in the technical proposal.

Indicative Capacity Range

  • 250–5,000 kg botanical/batch

Key Specification Inputs

Steam rate, oil yield assay, condenser duty, oil-water separation.

Typical Process Route

1

Preparing the crop

Material is cleaned, sorted and, where the crop calls for it, chopped or crushed to a size that lets oil escape without packing the still. How the crop is dried and stored after harvest changes oil yield and composition, so the handling routine is settled crop by crop.

2

Loading and distilling, or cold pressing

The charge goes into the SS 316L still and is distilled with steam, in water, under vacuum or under pressure. Oil-rich peel, such as citrus, can instead be cold pressed rather than distilled.

3

Condensing

Vapour from the still passes to the condenser, where the volatile oil and water vapour become liquid together. The condenser duty sets how fully the oil is captured.

4

Separating oil from hydrosol

Condensate runs into a stainless-steel Florentine flask. The oil separates from the water because the two differ in density, so the oil is drawn off, and the water phase, the hydrosol, can be kept as a co-product.

5

Polishing and drying

The crude oil is filtered to remove particles and dried to remove entrained water before storage.

6

Testing and records

Each batch is checked against agreed physical and analytical parameters, and batch records are kept before the oil is released.

Major Plant Equipment

  • Crop cleaning and chopping unit
  • SS 316L still (steam, hydro, vacuum or pressure mode)
  • Steam boiler or steam supply connection
  • Condenser with cooling-water circuit
  • Stainless-steel Florentine flask (oil-water separator)
  • Hydrosol collection tank
  • Oil polishing filter and drying unit
  • Cold-press extractor (citrus peel route)
  • Oil storage vessels
  • PLC panel, electrical MCC and instruments

Plant Output

Crude and polished essential oilHydrosol (aromatic water) as a co-productCold-pressed citrus peel oil (cold-press route)Spent plant material, usable as boiler fuel

Applications

  • Aromatherapy and massage oils
  • Fragrance and perfumery compounds
  • Flavour oils for food and beverages
  • Cosmetic and personal-care formulations
  • Hydrosols (aromatic waters) sold as a co-product
  • Oil supply to pharmaceutical and nutraceutical formulators

Key Features

  • Stainless-steel contact surfaces

    SS 316L wetted parts resist corrosion and protect oil purity, with clean-in-place washing between batches.

  • Condensing and Florentine separation

    A well-sized condenser and a stainless-steel Florentine flask capture the oil and keep it apart from the hydrosol.

  • Route chosen for the crop

    Steam, hydro, vacuum, pressure or cold-press operation is selected for the feedstock and the oil in question.

  • Hydrosol as a co-product

    Separated aromatic water can be collected and sold or reused rather than lost.

  • Controls and clean build

    PLC-based automation and hygienic design support repeatable batches with records.

Country Pages for Essential Oil Distillation Plants

This product is listed on the pages of the countries below, each with its own enquiry route. Where Kadali has no office in a country, enquiries are handled from the Accra office.

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Frequently Asked Questions

What should I decide before choosing an essential oil distillation plant?
Decide the crop and plant part, whether it arrives fresh or dried, the batch size you can fill with your supply, the oil specification your buyer tests for, and the steam source (boiler fuel and water). Cooling water for the condenser and a site for storing oil away from heat, light and air also need planning, since light, temperature and oxygen all degrade oil in storage. These points matter more than the exact still design, and the supplier needs them to propose a route.
How do steam and hydro distillation differ?
In hydro distillation the plant material sits in boiling water, whereas in steam distillation only the steam passes through it. Steam distillation is the usual commercial method. Water and high temperatures can chemically alter some oils, and in hydro distillation some polar, oxygenated compounds may dissolve in the water and be partly lost. Cost also matters: for some crops, lavender among them, hydro distillation has been found cheaper, so the choice depends on the crop, the oil and the economics. Vacuum and pressure routes use different operating conditions again. Confirm the choice by trials where possible.
Why can oil yield differ between batches of the same crop?
Yield and composition are affected by the species and chemotype, the plant part, the stage of growth, harvesting practice, the drying and storage of the material before distilling, and the distillation method and time. For that reason an oil yield assay on your own crop is the figure to size the plant from.
How should crops be handled before distillation in tropical conditions?
Move cut material to the still quickly, or wilt or dry it where the crop allows. Drying method and storage conditions after harvest affect both the yield and the composition of the oil, and some crops are distilled fresh and others after partial drying, so ask the supplier to confirm the practice for your crop rather than assume one routine. Keep soil, stones and other plants out of the charge, and keep records of harvest date and handling for each lot.
Is cold pressing a better choice for citrus peel?
For oil-rich peel such as citrus, cold pressing is an alternative route to distillation. It is a different machine and process from a still, so the decision is made on the product you want and the way your market describes it. The essential oil and oleoresin solutions page summarises the plants in this field.
What is the difference between an essential oil plant and an oleoresin plant?
Distillation recovers the volatile fraction of a plant, the essential oil. A spice oleoresin is a solvent extract that also carries non-volatile flavour, colour and pungency compounds; ginger oleoresin, for example, contains gingerols as well as essential oil. If the whole spice extract is what you sell, look at the spice oleoresin extraction plant. Specific oil pages, such as clove or ylang-ylang, describe individual crops.
Should I choose a batch or a continuous plant?
Batch plants suit a site that distils different crops in turn, because each crop can have its own conditions and the equipment is cleaned between runs. Continuous running suits large volumes of a single feedstock. The decision depends on crop mix, throughput and investment.
What should I send for a technical proposal?
Send the crop and plant part, its moisture on arrival, the batch size you expect to fill, the oil specification, the steam and cooling-water sources on site, and any existing yield figures. Steam demand per batch and condenser cooling-water flow follow from these.
What does an essential oil distillation plant cost?
Cost follows the route (steam, hydro, vacuum, pressure or cold press), the number and size of stills, the boiler and condenser capacity, the level of automation, and whether oil polishing, drying and storage are included. Batch or continuous running and throughput matter too. Send your crop and target output and a project-specific quotation can be prepared.

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