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This is a dark reddish-brown viscous liquid present within the honey comb framework of the cashew nut shells, which consists of 20-30% of oil content based on shell type. Although majority of the population are aware of cashew kernels that are taken as food, few are aware of the fact that the cashew shell holds a precious industrial liquid, which is highly applicable in polymer, chemical, resin, rubber, and coating sectors.
CNSL oil is a non-edible bio-based, renewable industrial oil that contains a high percentage of unsaturated phenols such as cardanol, anacardic acid, and cardol and is ideal in the production of phenolic resins, specialty chemicals, adhesives, and polymers.
Sudarshan Oil Expellers, Ludhiana, Punjab, India, is a manufacturer of high-performance CNSL oil extraction plants with the highest yield and performance. Industrial clients in India and other parts of the world trust our oil expellers in Punjab.
Every cashew nut has:
When cashew kernels are processed, the shells are discarded which has a typical CNSL 20-30% by weight. Rather than discarding these shells as wastes, the latest processors recover CNSL oil through special mechanical CNSL oil expellers which produces high quality industrial CNSL oil to the international markets.
CNSL oil is exceptional in the way that it is:
It can be used in industrial-grade applications where petroleum-based oils prove less sustainable, such as in resin production, brake linings, coatings, rubber, and specialty chemical production.
CNSL oil has a number of distinctive characteristics that can be used in industry:
Due to these properties, CNSL is a green substitute of petroleum based chemicals, which are widely used both in India and abroad.
Some of the industrial products that use CNSL oil include:
CNSL based resins are perfect in friction materials because of heat resistance and resilience.
The main raw material of phenolic resins is CNSL; it has applications in:
Coatings made using CNSL are resistant to corrosion, chemicals, and moisture, particularly in marine and industrial settings.
CNSL is a modifier applied to enhance elasticity, durability and heat resistance.
Processed into antioxidants, surfactants, stabilizers, and plastic additives.
Anti-termite timber treatment, lubricants, biofuels and energy research uses, and nanomaterials.
CNSL (Cashew Nut Shell Liquid) extraction is a mechanical but heat-regulated process which transforms cashew shell waste to industrial-grade CNSL oil. Sudarshan Oil Expellers develops CNSL oil extraction equipment in a manner that maximizes oil recovery, safety, and efficiency.
After cashew nuts are refined to produce edible kernels, they leave behind a huge amount of empty shells. The shells have CNSL oil trapped within their structure.
Before extraction:
Oil yield and machine protection is enhanced by proper preparation.
Cashew shells that are prepared are placed into a CNSL oil expeller machine, which can be fed by hand or by using a feeding mechanism, e.g., conveyor or hopper.
Inside the expeller:
This is the main extraction step. During the passage of the shells through the expeller:
The design of expellers is heavy-duty to ensure:
The CNSL oil obtained is discharged out of the expeller and collected by:
At this stage:
Proper collection helps to avoid exposure, spillage, and contamination.
Raw CNSL oil is extremely reactive and inflammatory. Heat treatment is done to make it stable and fit to be used in industrial applications.
In a reaction vessel:
This step also:
Sudarshan Oil Expellers incorporate controlled heating processes in order to have safe and efficient processing.
For better quality:
This step is advisable when the oil is to be used for:
Cleaner oil is priced higher in the market.
The completed CNSL oil is stored in:
From here, the oil can be:
CNSL is used to produce CNSL derivatives such as cardanol.
Oil is stored properly, which preserves the quality and ensures that it is not oxidized.
Sudarshan Oil Expellers, the leading manufacturers of CNSL oil expellers in Ludhiana, Punjab, supplies the CNSL extraction plants with:
Equipment | Function | Key Features |
Oil Expeller | Cracks shells to get oil out of them | Rotating screws, variable chamber gaps to fit shells of different sizes and recover as much as possible |
Reaction Vessel | Removes impurities | Cylindrically shaped with a conical base, steam coils, agitator drive. |
Steam Boiler | Provides heat | Vertical/horizontal multi-tubular, fuels: coal/husks/oil. |
Bucket Elevator | Vertical shell transport | Chain of buckets on belt/chain, damage-free handling. |
Screw Conveyor | Horizontal movement of materials | Helica augers in U-trough, MS/SS construction. |
Oil Storage Tanks | Holds purified CNSL | Corrosion-resistant long term storage. |
Control Panel | Automates operations | Dust-proof, MCBs, MIMIC diagram, starters, overload relays. |
Following oil recovery, the residual shell cake:
It is commonly used as:
This makes the process energy efficient and zero waste.
CNSL extraction is a safe, profitable and sustainable business for cashew processors, industrial investors or new investors, provided done with the right machinery. CNSL conversion transforms the agricultural waste into industrial prosperity.
Our turnkey CNSL oil extraction solutions and oil expellers in India assist businesses in extracting value and not oil.
