Walnut Oil Processing Solutions

Ocean offers turnkey solutions which covers all of the main processes of Walnut oil production line

Walnut Oil Pretreatment & Pressing Process
Walnut Oil Extraction Process
Walnut Oil Refining Process

Solution Features

Since walnut seeds are minor oilseed crops, they may come into contact with plastic products during harvesting, packaging, and transportation. Plastics contain plasticizers, which are fat-soluble substances, insoluble in water but soluble in organic solvents like ethanol and ether. Plasticizers are classified as Group 2B carcinogens by the World Health Organization. Ocean’s solution removes plasticizer components from the oil through high vacuum and high-temperature treatment in the refining process, achieving a level superior to national standards.

Walnut oil has two different processing methods:
1. Extraction Method
2. Pressing Method

Each method requires different refining processes to meet packaging and consumption standards. Additionally, after dehulling, walnut seeds have a wax content in the crude oil ranging from 110 to 150 mg/kg. Therefore, a dewaxing unit needs to be added to the conventional refining process.

Refining Process for Oil Produced by Extraction Method:
Crude oil → Acid mixing → Acid reaction → Alkali mixing → Neutralization reaction → Centrifugal separation → Water wash reaction → Centrifugal separation → Drying → Mixing with decolorizing agent → Decolorization filtration → Gas stripping → Heating → Combined deacidification and deodorization → Heat exchange and cooling → Refined oil → Cooling crystallization → Plate and frame filtration → Finished first-grade oil

Refining Process for Oil Produced by Pressing Method:
Crude oil → Hydration with saturated brine→ Sedimentation → Removal of gum substances → Cooling to precipitate wax → Clear oil filtration → Polishing filtration → Pressing finished oil

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