Our Company – VIRIDIS provides:
- Consultation, feasibility and design of new projects.
- Engineering and construction of palm oil mills
- Procurement and supply palm oil milling plant & machinery
- Repairing, servicing, maintenance & upgrading of palm oil mills
- Fabrication, installation, supervision and erection of factories and workshop buildings.
- We provide technical support, advice and training to our customers so that they will be comfortable and confident in using our products.
VIRIDIS Palm Oil Mill processing solutions consist of:
In order to avoid an excessive production of free fatty acids due to a natural enzymatic process in the mesocarp, transportation of the fresh fruit bunches (FFB) from harvesting to sterilising should not exceed 72 hours. In normal conditions, palm oil of fresh fruits contains about 1% free fatty acids (FFA). This content tends to increase rapidly with the maturation of the fruits and thus, could affect the value of the oil.
FFB are sterilised in order to inactivate the natural enzymatic activity and loosen the fruit, as well as to soften the mesocarp, resulting in easier extraction of oil. Sterilisation is carried out in autoclaves of 20 to 30 tons FFB capacity, with the application of steam, at temperature of 130 °Celsius and pressure of 3.1 bars, for 90 minutes.
The sterilised FFB are sent to rotary drum threshers to separate the sterilised fruits from the bunch stalks. The generated residues from this process include empty fruit bunches (EFB) which contain moisture. EFB can be used as organic fertiliser and soil conditioner as itmaintains humidity of the soil. Some mills introduce EFB pressing techniques to achieve lower moisture content in the EFB, which can subsequently be used as biomass fuel in suitable boiler systems for steam/electricity production.
The separated fruits are discharged into vertical steam-jacketed drums (digesters) and treated mechanically to convert them into a homogeneous oily mash. Hot water is added to the digester to facilitate homogenisation. This mash is subsequently put into the oil extraction press (screw press).
Screw pressing is a process to extract palm oil from mash. The extracted oil phase is collected and discharged to the purification section while the solid parts comprising fibre and nuts are separated by physical means.
In complete palm oil production plant, clarification is the process that ensures removal of all impurities from the crude oil. The sludge is taken different tank chambers and processes to remove particles and other suspended materials. Settling tanks that are based on gravity are used in eliminating the solids. In other levels, the centrifuge can be taken into action. High temperatures of 85-90 degrees are used and water introduced to dissolve the content. At the end of palm oil clarification, a vacuum dryer is used to evaporate water from the oil.
In large-scale mills the purified and dried oil is transferred to a tank for storage prior to dispatch from the mill. Since the rate of oxidation of the oil increases with the temperature of storage the oil is normally maintained around 50°C, using hot water or low-pressure steam-heating coils, to prevent solidification and fractionation. Iron contamination from the storage tank may occur if the tank is not lined with a suitable protective coating.
After the solids parts leave the screw press, fibre and nuts are separated by physical means. The fibre is used as biomass fuel in boiler on-site, whereas the nuts are sent to the nutcracker or ripple mill section for recovery of palm kernel, which is another product of palm oil mill besides crude palm oil (CPO).
Palm kernel recovery assures high efficiency recovery process of palm kernel after palm oil pressing processing line. It prepares for further step palm kernel oil pressing process after splitter and crushing.