What is The Process of Oil Palm Pressing? What Machine are Required?
The oil palm is the most economically valuable oil-producing plant globally. Transforming palm fruit bunches into crude palm oil requires a complete and comprehensive pressing process. This article will provide a detailed breakdown of the palm oil pressing process and the specific equipment required for each stage, drawing upon the expertise of Henan Huatai Cereals and Oils Machinery Co., Ltd. to offer professional technical guidance. The oil content within the palm fruit pulp can reach as high as 46% to 50%; consequently, the efficiency of the palm oil pressing process and the configuration of the equipment directly determine both the oil extraction yield and the quality of the final product.
Palm Oil Pressing Process Flow
The basic process route for palm oil pressing is as follows: Palm Fruit Bunches Reception → Sterilization → Threshing → Digesting → Pressing → Oil Clarification and Drying. Once crude palm oil has been obtained, the remaining press cake can undergo further processing for fiber separation and kernel recovery.
1) Palm Fruit Bunches Reception
Mature palm fruit bunches are transported by truck from the palm plantations to the palm oil pressing mill. After being weighed and recorded on a weighbridge, they are unloaded onto a receiving platform, where they await processing. It is imperative that the palm fruit bunches be delivered to the primary pressing mill within 24 hours of harvesting to prevent an increase in Free Fatty Acid (FFA) levels and to ensure the quality of the crude oil.
2) Sterilization
Sterilization is the critical first step in the palm oil pressing process. The palm fruit bunches are conveyed via a conveyor into a sterilization tank, where they undergo high-temperature steaming (typically at 145–150°C for approximately 2 hours). The sterilization process serves three primary objectives: First, it deactivates the lipase enzymes present in the fruit pulp, thereby preventing an increase in the free fatty acid content of the oil; second, it softens the fruit, facilitating the subsequent threshing and digesting stages; and third, it sterilizes the fruit to ensure product hygiene and quality. The palm fruit must be heated until the pulp becomes sufficiently soft—effectively breaking down the cellular structure of the pulp—to create optimal conditions for the subsequent pressing stage.
3) Threshing
Following the sterilization treatment, the palm fruit bunches contain fruit that has become soft and pliable; at this stage, the individual palm fruits must be separated from the bunches. This is typically achieved using thresher, which features an internal rotating drum mechanism that causes the palm fruits to detach from the bunches as it rotates. Palm fruits constitute approximately 60% of the fruit bunches. Once separated, the palm fruits proceed to the subsequent digesting and pressing stage, while the empty fruit bunches are discharged from the opposite end of the threshing machine; these can be utilized for composting or as biomass fuel.
4) Digesting
The palm fruits obtained from the threshing process are fed into digesting tanks for processing. The objective is to disrupt the fibrous cellular structure of the fruit pulp, rendering it loose and soft, thereby facilitating the complete release of oil during the subsequent pressing stage. The quality of the digesting process directly impacts the efficiency of the subsequent pressing and the overall oil extraction rate; it serves as a critical transitional step that bridges the preceding and succeeding stages of production.
5) Pressing
The digested palm fruits are fed into a palm oil press machine for oil extraction. The pressing stage typically employs a double-screw palm oil press, in which two opposing screw augers generate continuous compressive force to squeeze the oil out of the digested fruit pulp. The pressing process yields two distinct products: first, a mixture of oil, water, and solid impurities, which flows into the oil clarification section; and second, the press cake (a mixture of fibers and palm kernels), which proceeds to the kernel recovery section. Compared to single-screw models, double-screw oil presses offer superior oil extraction rates, lower energy consumption, and greater durability, making them particularly well-suited for medium-to-large-scale palm oil production operations.
6) Oil Clarification and Drying
The oil-water mixture obtained after pressing contains a certain amount of solid impurities and moisture, necessitating purification through clarification and drying processes. First, the mixture passes sequentially through a vibrating screen and a sand trap to remove grit and larger fibrous impurities. Subsequently, a plate-and-frame filter press is utilized to further remove fine impurities by consolidating them into a filter cake, which is then separated and removed. Following clarification and separation, the moisture-laden crude palm oil enters a vacuum drying system, where excess water is removed under vacuum conditions with continuous agitation. This process prevents the oil from undergoing oxidative rancidity or spoilage caused by excessive moisture levels. Finally, the dried crude palm oil is pumped into a temporary storage tank for holding.
7) Palm Kernel Recovery
The press cake remaining after the oil extraction process consists of a mixture of fruit pulp fibers and palm kernels. This material is conveyed to the fiber separation system for further processing. The separated palm kernels can undergo further processing—including crushing, pressing/solvent extraction, and filtration—to extract palm kernel oil. The resulting crude palm kernel oil is of excellent quality and finds application across various industries, such as cosmetics and food processing. Meanwhile, the separated fibers and shells can be utilized as biomass fuel. This comprehensive resource utilization model helps enhance both the economic efficiency and environmental sustainability of palm oil mills.
Summary of Equipment Required for Each Stage of Palm Oil Pressing
Based on the aforementioned process flow, a complete set of palm oil pressing equipment primarily comprises the following list of machinery:
| Section | Required Equipment | Function |
| Palm Fruit Bunches Reception | Unloading Platform, Truck Scale, Conveying System | Receiving and temporarily storing Fresh Fruit Bunches (FFB) |
| Sterilization | Sterilization Tank (Horizontal/Vertical Steam Type) | High-temperature sterilization, prevention of rancidity, and softening of fruit bunches |
| Threshing | Rotary Drum Thresher | Separating individual fruits from the fruit bunches |
| Digestion | Digester (Vertical Digester) | Breaking down fiber cells to increase oil extraction yield |
| Pressing | Double-screw (or Single-screw) Oil Press | Squeezing to extract crude palm oil |
| Oil Clarification & Drying | Vibrating Screen, Sand Trap Tank, Plate-and-Frame Filter Press, Vacuum Drying System | Removing impurities and moisture; purifying the crude oil |
| Kernel Recovery | Fiber Separator, Palm Kernel Press, Filter Press | Recovering palm kernels and pressing them to extract oil |
| Crude Oil Storage | Oil Storage Tank | Temporarily holding and storing the crude palm oil |
Palm oil production line configurations vary depending on the factory’s processing capacity. A basic production line (approximately 500 kg/h) requires only a fruit thresher, a single-screw oil press, and a plate-and-frame filter press to meet fundamental operational needs. A standard palm oil production line (with 10 to 1000 tons/d) necessitates a full suite of equipment, including sterilization tanks, fruit threshers, digesters, oil presses, clarification systems, and vacuum drying systems. Large-scale palm oil processing plant can be further equipped with modules for crude oil treatment and storage, as well as palm kernel recovery, thereby establishing a complete and integrated processing ecosystem.
It is worth noting that crude palm oil represents only the initial extraction product; to obtain high-quality finished palm oil that meets edible standards or export quality requirements, further refining is essential. The palm oil refining process primarily comprises four core stages: degumming, deacidification, decolorization, and deodorization. Depending on the production capacity, clients may select from batch refining (suitable for small-scale lines processing 1–20 tons/day), semi-continuous refining (suitable for medium-to-large lines processing 20–50 tons/day), or fully continuous refining (suitable for large-scale lines processing 50–600 tons/day). Following the refining process, palm oil can undergo fractionation to yield various palm oil products characterized by distinct melting points and application-specific properties.
Henan Huatai Cereals and Oils Machinery Co., Ltd.: Your One-Stop Expert in Palm Oil Pressing Equipment
Henan Huatai Cereals and Oils Machinery Co., Ltd. is a large-scale manufacturing enterprise specializing in grain and oil machinery. The company integrates R&D, design, manufacturing, installation, and after-sales service into a comprehensive operational framework. Spanning a total area of 100,000 square meters, the facility features modern, standardized workshops and is equipped with advanced, intelligent processing machinery.
1) Core Equipment for Palm Oil Pressing
Huatai Oil Machinery specializes in constructing palm oil mills with varying capacities—ranging from 10 to 1,000 tons per day (TPD)—and offers comprehensive, turnkey solutions covering everything from plant layout design and machinery manufacturing to on-site installation and commissioning. The complete palm oil processing system encompasses every stage of production—including raw material reception, sterilization, fruit threshing, pressing, crude oil processing and storage, palm kernel recovery, and biomass boiler power generation—while also integrating eco-friendly wastewater treatment modules to ensure green, compliant production.
2) Global Engineering Projects
Huatai Machinery has served over 1,000 oil and fat processing enterprises, exporting its products to more than 70 countries and regions worldwide. Our footprint covers major palm oil production hubs across Southeast Asia, Africa, Latin America, and beyond.
3) Service Assurance
Beyond supplying high-quality palm oil pressing equipment, Huatai Oil Machinery provides clients with end-to-end services—from process design and equipment selection to installation, commissioning, and operational training. We dispatch professional engineers to provide technical guidance during installation and conduct production training, while also ensuring diligent follow-up through our after-sales support system. Leveraging our profound technical expertise, extensive engineering experience, and comprehensive service framework, Huatai Oil Machinery has established itself as a trusted brand in the global palm oil pressing equipment sector.
If you are planning a palm oil pressing project, welcome to contact us to receive expert process proposals and equipment selection recommendations. Based on your specific raw material characteristics, capacity requirements, and budget constraints, we can custom-tailor the most economical and efficient palm oil pressing production line solution for you—ranging from a single core machine to a complete turnkey facility—helping to ensure the smooth launch and successful operation of your palm oil processing project!
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