Pulsed Electric Field System
Boost palm oil extraction rates with the Pulsed Electric Field System. This advanced pulsed electric field (PEF) processing technology increases oil extraction rates by up to 2%, thereby improving oil yield by up to 10%. It can also reduce sterilization time and steam consumption. Retrofit-friendly, this PEF technology helps mills improve throughput by reducing sterilization time, increasing crude palm oil quality, lowering operating costs, and extracting more value from every fresh fruit bunch.
Recover more oil, improve crude oil quality, and minimize oil losses
- Increase crude palm oil extraction rates and yield
- Reduce sterilization time while recovering more oil from fresh fruit bunches
- Improve oil quality despite variations in fruit ripeness and crop quality
- Expand mill capacity and throughput
- Extend the service life of critical equipment through reduced wear and tear
The Alfa Laval Pulsed Electric Field System helps palm oil producers increase crude palm oil (CPO) extraction rates, improve oil quality, and reduce operating costs.
Developed in partnership with Elea, a global leader in industrial PEF technology, this next-generation pre-treatment solution enhances extraction performance by improving oil release before sterilization and pressing.
Pulsed electric field processing can improve oil extraction rates by up to 2% and recover up to 10% more oil from the same fresh fruit volume, improving productivity without increasing feedstock consumption.
Lower free fatty acids (FFA) levels and a higher degree of bleachability index (DOBI) support more efficient refining by minimizing oil losses and bleaching earth consumption. The result is a consistently higher quality of refined palm oil.
This advanced CPO solution addresses one of the industry's main bottlenecks: sterilization. Pre-treating fruit bunches in the PEF system can reduce sterilization time and help increase mill throughput.
By removing abrasive contaminants before PEF treatment, the system reduces wear on digesters, presses, and separation equipment – extending asset life while lowering operating and maintenance costs.
The result: higher oil yield, greater processing capacity, and stronger returns from every fresh fruit bunch processed.
How it works
The Alfa Laval Pulsed Electric Field (PEF) System is a non-thermal, pre-treatment technology for crude palm oil extraction. Instead of relying on heat, PEF technology applies bursts of high-voltage electrical pulses prior to sterilization and extraction. These electrical pulses alter the structure of plant cells, allowing more oils to be released, improving extraction yields, lowering energy costs, reducing oil losses in downstream refining, and improving product quality.
Pre-treatment and preparation
Fresh fruit bunches are washed to remove sand, dirt, and impurities, ensuring consistent process conditions before entering the pulsed electric field processing chamber. This helps ensure consistent operating conditions while reducing abrasive wear on downstream equipment.
Electroporation of plant cells
Inside the chamber, fruit bunches pass between electrodes where a precisely controlled high-voltage electric field, or pulse, is applied. The core function of PEF technology is to rupture plant cell membranes, creating microscopic pores or electroporation, preserving the integrity of the fruit without damaging the product through excessive heat.
Plant cell between electrodes
As a result, pulsed electric field processing improves cell permeability and enables more efficient oil release during downstream stages.
Electroporation: polarization of ions on the cell membrane and pore formation
Selective permeability and controlled cell disruption
The formation of pores increases membrane permeability, allowing intracellular water and soluble compounds (cell fluids) to migrate out of the cells. This controlled effect reduces internal pressure and softens the fruit structure without mechanically destroying the raw material. The cell walls remain largely intact, while only targeted permeability changes occur. This controlled response is a key advantage of pulsed electric field processing in modern CPO solutions.
Leakage of cell fluids. Large solids remain in the cell, depending on the treatment intensity
Improved downstream processability
As a result of electroporation, the palm fruit structure becomes softer and more malleable. Electroporation improves the release of oils during sterilization and pressing, reducing process resistance and increasing overall extraction rate. This reduces internal turgor pressure and softens the tissue structure.
Softer, more malleable cell structure
Process integration and control
As fruit bunches move continuously through the PEF treatment zone, the system precisely regulates electrode configuration and pulse settings to deliver the required level of electroporation. Operators can fine-tune treatment intensity in real time to account for variations in raw material quality and align with specific production objectives. This flexibility ensures consistent performance while maximizing extraction efficiency and process outcomes.
FAQs
Is the PEF technology industrially proven?
Yes, pulsed electric field (PEF) processing has been validated in continuous, large-scale food processing applications. Its roots date back to the 1920s with the invention of the Marx Generator by Erwin Otto Marx. However, advances in power electronics and control systems over the past two decades have enabled the safe, reliable, and precise generation of high-voltage pulses for commercial food processing.. Alfa Laval is collaborating with Elea Technology GmbH, a world leader in state-of-the-art industrial PEF systems, bringing proven expertise and operational experience to palm oil processing applications.
What are the advantages of the PEF technology?
Pulsed electric field processing offers multiple advantages in food and oil processing applications. As a non-thermal process, it uses short high-voltage electrical pulses to disrupt cell membranes, enabling faster sterilization while preserving sensitive product qualities, including taste, colour, and nutritional value.
In palm oil extraction processes, PEF treatment increases the permeability of cell membranes, allowing oils and other valuable compounds to be released more easily, improving extraction efficiency and product yields. PEF also supports downstream operations by enhancing bleaching performance and minimizing free fatty acid levels and overall oil losses.
What are the key challenges associated with the PEF technology?
Although the technology significantly enhances extraction efficiency, large-scale implementation remains constrained by factors, including substantial capital investment requirements and challenges related to industrial-scale integration.
Palm oil mills face additional pressures, such as:
- Climate variability affecting fresh fruit bunch quality
- Labour shortages and rising operating expenses impacting harvest timing
- Increasing regulatory demands and stricter product quality requirements
What is the operational experience with the PEF technology?
Industrial experience with pulsed electric field processing highlights its effectiveness as a non-thermal alternative to conventional heat- or chemical-based processing methods. The Alfa Laval PEF System has demonstrated in Malaysia significantly improved oil recovery of crude palm oil at industrial scale – up to 2% higher oil extraction rates (OER), or up to 10% higher oil yield compared to baseline conditions.
Applying short, high-voltage electrical pulses to fresh fruit bunches causes electroporation, disrupting cell membranes and facilitating the release of oils and cell contents. As a result, PEF can improve extraction yields and oil quality due to better bleachability and lower free fatty acid levels. After PEF treatment, the higher-quality CPO can lead to higher refining yields and operational savings, such as lower consumption of bleaching clay.
What are the service requirements for the PEF technology?
Minimal maintenance requirements can lead to massive downstream savings. The Alfa Laval Pulse Electric Field System delivers reliable, low-maintenance operation and supports continuous palm oil production. As a solid-state, non-thermal process, it requires minimal servicing compared with conventional mechanical processing equipment.
By pre-treating fruit before pressing, pulsed electric field processing reduces mechanical stress and wear on downstream equipment such as digesters and screw presses, extending equipment lifetime.