Food Grade Centrifuge | Mint Oil | Dolphin

Operation

A food-grade centrifuge is a specifically designed industrial centrifuge for beverage clarification. With a flow-through design, stainless steel food-grade centrifuges offer continuous processing. High centrifugal force (up to 10,000 Gs) separates beverages from fine impurities (1.0 micron).

Applications

Food and beverage industry applications for food-grade centrifuges include:

• Apple Juice and Other Fruit Juices
• Red and White Wine Clarification
• Beer Clarification
• Flavor Extraction
• Horseradish Juice Clarification
• Potato Juice Clarifier
• Clarified Butter Separator
• Fish Oil Separation
• Algae Cell Harvesting

Food-grade stainless steel disc centrifuge for kelp, seaweed, and algae oil processing. All wetted surfaces are 316L stainless steel to meet food safety standards.

Benefits

A food-grade disc-stack centrifuge offers several benefits over conventional filtration or other gravity-based separation technologies. The following is a list of the main advantages.

• Centrifuge Efficiency: Disc-stack centrifuges are highly efficient and can separate particles as small as 0.1 microns. A comparable filter to separate such small particles is not feasible for large fluid volumes.
• All Stainless Steel Fluid Contact: Food-grade centrifuge has all stainless-steel wetted parts, making them ideal for processing beverages and other fluids for human consumption.
• Processing Capacity: With a continuous, flow-through design, food-grade disc-stack centrifuges process large volumes without requiring filtration-related stoppage.
• Automatic Operation: Fully automated controls and the ability to discharge the separated solids automatically, disc-stack centrifuges offer labor-related cost efficiency as an additional benefit.
• Consistent Flow: Unlike filters which gradually reduce the flow as the particles block the filter media, disc centrifuges operate with a constant flow rate.
• Large Capacity to Size Ratio: A food-grade disc centrifuge has a much smaller footprint for similar processing capacity than a filter or settling tank. This feature is an advantage for facilities with limited space.

Specifications

Food-grade centrifuges are available in different configurations. These specifications are for the centrifuge described in the following case study.

Capacities vary by application and product viscosity. Contact our engineers for sizing recommendations specific to your process.

Material of Construction (MOC)

Most food-grade centrifuges have stainless steel as the primary material of construction. Some special applications with highly corrosive fluids may require exotic materials such as Hastelloy as the MOC.

The following table lists the construction material for the most common food-grade centrifuges.

Centrifuge Part	Material
Bowl Body	316 L Stainless Steel
Bowl Hood	316 L Stainless Steel
Inlet / Outlet Assemblies	316 L Stainless Steel
Centrifuge Hood (Top Cover)	Silumin or 316 L Stainless Steel
Centrifuge Frame	Cast Iron
Sludge Discharge Chute	Cast Iron or Stainless Steel (rare)
Separated Water Discharge	316L Stainless Steel or Cast Iron

Application Case Study

The following is a case study illustrating using a food-grade centrifuge for spearmint oil purification.

Mint Oil as a Flavoring Agent

Mint oil is a widely used food flavoring agent. Many consumable products, such as toothpaste, chewing gum, soap, etc., use mint oil.

Moisture in Crude Mint Oil

Crude mint oil contains moisture. This moisture removal is necessary before distillation to make the oil dry. Large amounts of water in the oil can cause an unacceptable load on the distillation system. Trace amounts of moisture left in the oil lead to quality & shelf-life issues. An industrial-scale stainless steel centrifuge is the solution!

Pilot Scale Feasibility Testing

One of the largest peppermint oil producers contacted Dolphin Centrifuge to perform a feasibility study on their oil. The producer wanted to explore centrifuges as a remedy for their moisture problem.

Dolphin Centrifuge proposed a pilot-scale test of their mint oil as a proof of concept. Our bench-top, pilot-scale disc centrifuge is ideal for such testing.

Disc stack centrifuges show high liquid/liquid separation efficiency. We processed a 20-gallon customer sample through our test centrifuge.

Testing Results

The customer technician used a 'freeze test' to verify the dryness of the separated oil (pure mint oil). He would freeze a small volume of the oil in a refrigerator.

Clear oil indicated the absence of moisture in the processed oil. All samples taken from our testing centrifuge were clear post-freezing. The customer acknowledged the test to be a success!

Production Validation

Based on the pilot-scale test, the customer purchased a stainless steel centrifuge from Dolphin Centrifuge. Crude mint oil has no particle contamination. So Dolphin supplied a solid bowl-type disc-stack centrifuge for their production. It was a stainless steel, food-grade centrifuge.

After the oil centrifuge installation and initial production, the customer returned to Dolphin. The realized production volume from the first unit was as expected. The quality of oil produced was beyond expectations.

Based on these facts, the customer ordered multiple food-grade centrifuge units for their entire production volume.

Need help selecting a food grade centrifuge for your application? Contact our engineers for a consultation and process evaluation.

Related resources: Disc Stack Centrifuge Overview | Stainless Steel Centrifuge | Sample Testing Program | Picking the Right Industrial Centrifuge | Beer & Wine Centrifuge | Oil Centrifuge