Natural Colour Extraction Plants

Leaves - Eucalyptus

Mechotech designs and manufactures turnkey natural colour extraction plants for eucalyptus leaves. In the Mechotech catalogue, Leaves - Eucalyptus is listed in the Orange Colour group alongside Skins - Brown Onion, Roots - Turmeric / Blood Root and Plant - Giant Coreopsis / Barberry. According to Mechotech’s article on orange colour extraction from eucalyptus leaves, the colour comes from a mixture of tannins, yellow flavonoids such as quercetin and rutin, and orange carotenoids rather than from chlorophyll, and the exact shade depends on the eucalyptus species, leaf maturity and processing. The catalogue does not name the species, so it is confirmed with the client. The plant is configured around the raw material and the target colour extract.

Mechotech’s Leaves - Eucalyptus plant is configured around the raw material and the target colour extract. It is built in SS 316L with integrated solvent recovery, automation and full documentation, and is delivered as a commissioned turnkey system. The article describes two main routes for the leaf colour: a water decoction of the chopped leaves, and ethanol or aqueous-ethanol extraction, which also dissolves less-polar pigments such as carotenoids. The extract is then clarified and its pH adjusted to tune and fix the hue. The line is therefore configured for aqueous or food-grade alcohol / aqueous extraction, filtration, vacuum concentration and standardisation, with leaf species, maturity and extraction conditions held consistent between batches because the article names these as the main sources of variation. Final parameters are established during process development and pilot validation.

Technical Specifications

Product	Leaves - Eucalyptus Natural Colour Extraction Plant
Raw Material	Eucalyptus leaves (catalogue name: Leaves - Eucalyptus)
Botanical Name	Genus Eucalyptus; the species is not stated in the catalogue and is confirmed with the client (the article notes that different eucalyptus species give different hues)
Plant Part / Feed Form	Leaves, fresh or dried (mature leaves give the strongest colour, per the article); washed and cut or crushed before extraction; exact form confirmed with the client
Colour Group	Orange Colour (see the Orange Colour page)
Colour-forming Components	Tannins (hydrolysable and condensed), yellow flavonoids and flavonols such as quercetin and rutin, and orange carotenoids (per the article)
Process Category	Natural Colour Extraction Plants
Extract Type	Natural colour extract (liquid concentrate or dried powder, per specification)
Extraction Method	Closed jacketed SS 316L extraction at controlled temperature over several cycles: water (decoction) or ethanol / aqueous ethanol, as described in the article; the route is confirmed during process development
Product-contact Material	SS 316L
Filtration System	Plate-and-frame filter press with cartridge polish filters
Concentration System	Falling-film / vacuum evaporator with solvent recovery where a solvent is used
Drying System	Spray or vacuum dryer, where a powder is required
Automation	PLC-based
Plant Capacity	Configured to requirement
Utility Requirements	Steam, chilled/cooling water, compressed air and power (project-specific)
Compliance	GMP hygienic design; full documentation for qualification
Final Product Form	Natural colour extract (orange colour group)

Plant Capacities

Plant Scale	Raw Material Throughput	Typical Use
Pilot	Configured to your feedstock and trial plan	Product development, parameter validation
Semi-Commercial	Configured between pilot and commercial scale	Scale-up trials, contract manufacturing
Commercial	Configured to raw-material supply and confirmed buyer volume	Commercial production

Capacity is configured to raw-material supply, confirmed buyer volume and investment timeline; a pilot plant is recommended to validate parameters before scaling.

Manufacturing Process

Raw Material Preparation

Fresh or dried eucalyptus leaves are authenticated, washed to remove dust, tested for moisture and cut or crushed to increase the surface area so the pigments diffuse into the solvent; mature leaves are preferred for stronger colour (per the article) and the particle size is set during process development.

Extraction

The prepared leaves are extracted in closed jacketed SS 316L vessels at controlled temperature over several cycles, with water (a prolonged simmer, as in the article’s decoction route) or ethanol / aqueous ethanol, which also dissolves less-polar pigments such as carotenoids. The route and conditions are set during process development.

Filtration & pH Adjustment

The extract is separated from the spent leaves and clarified through a plate-and-frame filter press followed by cartridge polish filters. The pH is adjusted where the hue needs tuning, because the article notes that acidic conditions warm the colour toward orange and red.

Concentration & Solvent Recovery

The dilute extract is concentrated in a falling-film / vacuum evaporator, with solvent recovered through the condenser return system where a solvent is used.

Standardisation

The concentrate is assayed and adjusted to the declared target colour specification, such as shade and colour strength, with leaf species, maturity and extraction conditions held consistent between batches.

Drying & Quality Control

The standardised extract is supplied as a liquid concentrate or spray- or vacuum-dried to a powder, per specification, then released after assay, residual-solvent (where a solvent is used), heavy-metal, microbial and moisture testing.

Major Plant Equipment

Raw material cleaning, authentication and moisture testing
Leaf washing and size-reduction system (cutting or crushing)
Closed jacketed SS 316L extraction vessels
Solvent storage tanks
Plate-and-frame filter press
Cartridge polish filtration
Falling-film / vacuum evaporator
Solvent recovery unit and condensers
pH adjustment and dosing arrangement
Standardisation / blending vessel
Spray or vacuum dryer
CIP system
Automation and instrumentation

Plant Output

Natural colour extract (orange colour group), as a liquid concentrate or dried powder per specification

Applications

Natural orange, rust and reddish-orange colour and dye ingredient supply
Natural dyeing and eco-printing of textiles, where eucalyptus tannins act as a built-in mordant (per the article)
Food colour applications (subject to approval of the specific colour in each market)
Cosmetic and personal-care colour applications

Key Features

SS 316L Construction
Electropolished SS 316L product-contact surfaces with CIP operation between batches.
Closed-Loop Solvent Recovery
Where a solvent route is used, integrated condenser-return recovery reuses solvent between batches and reduces solvent loss.
Standardised to Specification
In-process and batch-release assay are used to check the finished extract against the agreed target specification, such as shade and colour strength.
Hue Control
pH adjustment is used to tune and fix the hue; in dyeing, alum brightens the colour toward orange and iron shifts it toward khaki (per the article). The shade on a given fibre or product is established in application trials with the client.
Scalable Batch Capacity
Plants are configured to requirement from pilot scale upward, with modular expansion.

Frequently Asked Questions

Does Mechotech supply the complete machinery for Leaves - Eucalyptus?

Yes. Mechotech supplies the complete turnkey plant for Leaves - Eucalyptus — engineered, fabricated at our Hyderabad facility, installed and commissioned as a single integrated system. Final process parameters are established during process development and pilot validation.

What specification can the Leaves - Eucalyptus plant achieve?

The plant is configured to the client’s target specification for Leaves - Eucalyptus; the specification achieved is established during process development and pilot validation, and batch-release testing with certificate-of-analysis documentation is defined with the client.

What production capacities are available for the Leaves - Eucalyptus plant?

Capacity for the Leaves - Eucalyptus plant is configured to raw-material supply, confirmed buyer volume and investment timeline, starting at pilot scale; a pilot plant is recommended to validate parameters before scaling.

Which industries use the Leaves - Eucalyptus plant?

The end-use areas listed for Leaves - Eucalyptus are given under Applications. The end use, the colour shade and the target specification are confirmed with the client before the plant is configured.

Which raw material is processed in the Leaves - Eucalyptus plant?

The catalogue lists eucalyptus leaves. The species is not stated in the catalogue; Mechotech’s article notes that different eucalyptus species give different hues and that mature leaves give stronger colour than young growth, so the species, the leaf maturity and whether the leaves are fresh or dried are confirmed with the client before the plant is configured.

What gives eucalyptus leaves their orange colour?

According to Mechotech’s article, the colour does not come from chlorophyll but from a combination of tannins, yellow flavonoids such as quercetin and rutin, and orange carotenoids, which together with the leaf’s organic acids and trace metals give yellow, orange, rust and reddish-orange tones. The abundant tannins also make eucalyptus largely self-mordanting. Read more in Orange Colour Extraction from Eucalyptus Leaves.

How does the Leaves - Eucalyptus extraction process work?

The cut or crushed leaves are extracted in closed jacketed SS 316L extractors at controlled temperature with water or ethanol / aqueous ethanol, clarified by filtration, pH-adjusted where the hue needs tuning, concentrated under vacuum, standardised to the target colour strength, dried where a powder is required and quality-tested. The final route and conditions are set during process development and pilot validation.

Why does eucalyptus colour vary between batches, and how is it controlled?

The article attributes the variation to eucalyptus species, leaf maturity, growing conditions, season, whether leaves are fresh or dried, and trace metals in the leaf and water. For consistent output it describes standardising on particular species and leaf grades and controlling extraction and pH tightly. Which of these levers applies to the client’s leaf supply is established during process development.

Can the same eucalyptus leaves give both essential oil and colour?

Mechotech’s article says the leaves are commonly steam-distilled for essential oil and that the spent leaf and the coloured aqueous fraction still hold tannins, flavonoids and some carotenoids that can be worked up for pigment, which needs integrated distillation plus extraction, filtration and concentration equipment. This page covers the colour route only. The oil routes are on Eucalyptus Globulus, Eucalyptus Radiata, Eucalyptus Citriodora and Lemon Eucalyptus, and Eucalyptus Leaf Phenolics Extract is the separate phenolics extraction plant.

Where does this page sit in the orange colour range?

Leaves - Eucalyptus is part of the Orange Colour group (hub page: Orange Colour). The product tree lists these neighbouring pages in the group: Skins - Brown Onion; Roots - Turmeric / Blood Root; Plant - Giant Coreopsis / Barberry. The overall catalogue hub is Natural Colour Extraction Plants.

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Leaves - Eucalyptus