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Herbal Extraction Plants
Herbal, Botanical & Nutraceutical Extraction

Herbal Extraction Plants

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Stainless-steel extractor vessels, vapour lines and condensers on a mezzanine inside an installed herbal extraction plant

Herbal Extraction Plants

A herbal extraction plant turns dried medicinal or aromatic plant material into a concentrated extract or a free-flowing powder. For a processor in Africa, the first questions are about the feedstock and the extract rather than the vessels: which plant part is bought (leaf, calyx, root, bark or fruit), how dry and how consistent it is across the seasons, and what the customer expects the extract to contain. The plants are listed as complete trains in SS 316L, sized once those answers are written down; who engineers, supplies and installs each item is confirmed in the technical proposal. Typical users are botanical ingredient makers, extract producers, nutraceutical businesses and contract processors. The planning capacity range is shown elsewhere on this page.

Every herbal plant follows the same backbone: feed preparation, extraction, separation of liquid from spent herb, concentration with solvent recovery, standardisation and drying. What differs from one herb to the next is the solvent system, the number of extraction stages, the time and temperature of each batch and the way the concentrate is dried. Product-contact parts are SS 316L and the controls are automated. Capacity and utilities are confirmed project by project.

Indicative Capacity Range

  • 100–5,000 kg feed/day

Key Specification Inputs

Extraction solvent/water, extraction stages, batch time, filtration and recovery.

Typical Process Route

1

Receiving and checking the herb

Each lot is identified against the botanical name and plant part ordered, its moisture is measured and foreign matter is removed. A lot that fails these checks should not reach the extractor, because everything downstream depends on it.

2

Milling to a uniform size

The herb is reduced to an even particle size. Particle size affects how well the solvent takes up the actives, so the grind is set by trial on each herb, with the later filtration kept in mind.

3

Extraction

The milled herb is contacted with water, alcohol or a hydroalcoholic mix inside a closed, jacketed SS 316L extractor. Temperature is held under control, and the herb is often extracted in more than one cycle to recover the target actives more fully.

4

Separating liquid from spent herb

The extract (miscella) is clarified through a plate-and-frame filter press, then passed through cartridge filters for polishing. The spent herb leaves the plant as solid residue.

5

Concentration and solvent recovery

A falling-film or vacuum evaporator removes most of the solvent. Vapour is condensed and returned through the condenser system, so alcohol can be reused instead of discarded.

6

Standardisation

The concentrate is assayed against the specification agreed for that herb and adjusted until it meets the declared target. This step is done before drying, while the material is still liquid.

7

Drying and release testing

The standardised extract is dried by spray or vacuum drying. Before release it is tested against the specification agreed with the buyer, which typically covers assay, residual solvent, heavy metals, microbial load and moisture.

Major Plant Equipment

  • Cleaning and sieving line for the dried herb
  • Mill or pulveriser
  • Jacketed SS 316L extractor
  • Solvent storage tanks and transfer pumps
  • Plate-and-frame filter press and cartridge polish filters
  • Falling-film / vacuum evaporator
  • Condensers and solvent recovery unit
  • Standardisation and blending vessel
  • Spray dryer or vacuum dryer
  • Clean-in-place (CIP) skid
  • Automation panel and instruments

Plant Output

Herbal extract as a standardised liquid concentrateDry extract powder from spray or vacuum dryingRecovered solvent returned to the processSpent herb residue

Applications

  • Traditional and Ayurvedic herbal medicine makers needing consistent extracts
  • Standardised botanical ingredients for pharmaceutical and herbal-medicine manufacturers
  • Extracts for capsule, tablet and supplement producers
  • Flavour, food and beverage ingredient supply
  • Cosmetic and personal-care botanical actives

Key Features

  • Hygienic stainless-steel build

    Wetted surfaces are electropolished SS 316L, and the plant is designed for clean-in-place washing between batches.

  • Solvent returned to the process

    Condensed solvent is collected for reuse after each batch, which limits solvent purchase and the waste to be handled.

  • Set up around the herb

    Solvent, temperature and cycle time are chosen for the chemistry of the herb and the specification the buyer has to meet.

  • Matched drying

    A spray or vacuum dryer sized to the concentrate delivers a low-moisture powder suitable for blending or filling capsules.

  • Spent herb to plan for

    The spent herb leaves the extractor as a damp solid residue, so the site needs a handling route for it, such as compost or boiler fuel where the herb allows.

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Frequently Asked Questions

What should I settle before asking for a herbal extraction plant?
Start with five points: the herb and plant part, its moisture and how reliably you can buy it across the year, the extract you intend to sell and how its quality will be measured, the extraction route (water, alcohol or a mixture) and the volume per day or per batch. Add the market you sell into, since it sets the residual-solvent and contaminant limits the extract must meet. With these written down, a supplier can size the extractor, evaporator and dryer rather than guess.
Which herbs can a herbal extraction plant handle?
A plant is engineered around one herb or a defined group of herbs. Moringa leaf, hibiscus calyx, ginger, turmeric and aloe are examples with their own pages; see the moringa, hibiscus and ginger pages. The list of herb-specific pages below shows the full range. Tell the supplier your own botanical and plant part, so that the page closest to it can be used as a starting point. The same herb can give extracts of quite different composition depending on the solvent, the temperature and duration of extraction and the drying method, which is why these are fixed for each herb.
Should I extract with water, alcohol or a mix of both?
It depends on what you want to recover. Water suits water-soluble constituents. Ethanol, usually as a water-alcohol mixture, can take up both polar and non-polar substances, and in liquid extracts such as fluidextracts the alcohol also acts as a preservative. Alcohol is flammable: the extraction and recovery areas need explosion-protected electrics, good ventilation and closed solvent transfer. A water-only route is simpler to site but leaves a wetter concentrate to dry. Small laboratory trials on your own herb are the sound way to choose.
How should the herb be prepared in warm, humid conditions?
Dry it promptly and evenly to a safe moisture level, keep it off the ground, and store it in clean, ventilated, pest-proof bags or bins. Drying lowers moisture enough to hold back microbial activity, and because mycotoxins follow from mould spoilage, they are prevented mainly by controlling temperature, moisture and pests. Remove soil, stones and other plants before milling, and agree a moisture limit and a particle size with the supplier of the herb before each season.
How is this different from a nutraceutical extraction plant?
The machinery is closely related. A herbal plant is set up around a wide range of medicinal and traditional herbs, while the nutraceutical and botanical plant puts more weight on standardising to a declared marker compound for supplement formulation. A site that wants to switch between several herbs may also look at the multi-herbal extraction plant, which is suited to that kind of use.
What drives solvent and energy use in an extraction plant?
Mainly four things: how much solvent is used per unit of herb, the number of extraction stages, how much liquid has to be evaporated to reach the target concentration, and how well the solvent is recovered. A dilute extract means more liquid to evaporate. Steam or hot water, cooling water for the condensers and electricity for pumps, mills and the dryer should all be confirmed for the site. The solvent recovery plant page explains the recovery side in more detail.
What should I prepare for a technical proposal?
Bring the botanical name and plant part, a representative sample if possible, the moisture and the particle size you receive it in, the specification of the extract and the test method for it, the volume you plan to process, available utilities and the market you will supply. See also the herbal and botanical extraction solutions page.
What does a herbal extraction plant cost?
The price follows the herb, whether batches or continuous running is chosen, the size of the extractor and evaporator, and the dryer. Send the herb, daily volume and extract specification, and a project-specific quotation can be prepared.

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