Walnut Oil Processing Plant — Complete Pretreatment, Pressing, Refining & Bottling Solution
This Guance Machinery a Walnut Oil Processing Plant, covering pretreatment, oil pressing, semi-continuous refining, and automatic bottling.
It’s solutions for plant managers, process engineers, and investors who need a practical, step-by-step solution that balances yield, oil quality, operating costs.
Raw Materials to Finished Oil Legend
Walnut
Cleaning Walnut
Walnut Oil Pressing
Walnut Oil Refining
Step-by-Step Walnut Oil Processing Flow Chart
Walnut Oil Processing Steps
1. Raw walnut receiving & storage: inspection, sorting, moisture check.
2. Oil pretreatment: cleaning, dehulling/shelling, kernel separation, conditioning (crushing/flaking, softening).
3. Oil pressing: cold pressing (≤ 60°C) for premium oil or hot pressing for higher yields. Often a two-pass pressing strategy is used (pre-press + final press).
4. Refining: semi-continuous oil refinery plant performing degumming, neutralization (deacidification), bleaching and deodorization to meet shelf-stable edible oil specs.
5. Polishing filtration, storage & blending: polishing filter, stainless bulk tanks with nitrogen blanketing when needed.
6. Automatic bottling machine: rinsing/filling/capping/labeling and date coding on a hygienic line.
Walnut Oil Extraction and Refining Process
Here’s a breakdown of the Walnut Oil Extraction and Refining Process:
Oil Pretreatment
Cleaning & destoning: removes foreign materials that damage machinery or contaminate oil.
Kernel Shell Machine: walnut kernels must be separated from shells — shells have very low oil and high fiber, and cause abrasion.
Crushing / flaking / cooking: flakes increase surface area for pressing, and gentle conditioning (temperature/moisture control) improves yield for both cold and hot pressing.
Cleaning Machine
Destoner Machine
Kernel Shell Machine
Cooker
Oil Pressing & clarification
Screw oil press: common for commercial walnut lines; good throughput, lower labor. Can select be configured for cold or hot pressing with temperature control
Hot pressing: higher yield, lower cost per kg oil; often combined with a semi-continuous refinery when product must be shelf stable.
A centrifuge can be added for faster clarification and lower free fatty acid carryover.
Screw Oil Press
Centrifuge
Oil Refining Process
A semi-continuous refinery processes batches of crude oil through continuous-looking operations (degumming, neutralization, bleaching, deodorization) in specialty oil plants.
Advantages: lower capital than fully continuous large refineries, higher product quality than simple cold-pressed, and easier to operate for multiple oil types.
1. Degumming: remove phospholipids and hydratable gums (acid or water degumming).
2. Neutralization / deacidification: reduce free fatty acids (alkali neutralization or physical deacidification depending on final spec).
3. Bleaching: remove pigments and residual trace metals (use activated earth or bleaching clay).
4. Deodorization: steam distillation under vacuum to remove volatile off-odors and lower peroxide values.
5. Polishing filtration: remove spent earth and final particulates.
Sizing example: semi-continuous units are commonly available from 1–50 t/d (and up); client selection depends on desired throughput and product mix.
Degumming
Decolorization
Deacidification
Deodorization
Walnut Oil Processing Bottling Process
Oil Bottling Process is crucial to producing a high-quality final product that meets consumer standards.
Bottling Process
Choose anautomatic bottling machine an aseptic-compatible design for high-value walnut oil.
Key functions: volumetric/flow metering fill, capping, labeling, date coding.
Match filler head count to plant throughput: e.g., 1 t/d of finished oil ≈ 1000 L/day ≈ 2000 x 500 mL bottles; select 4–8 heads for small plants, 12–24+ heads for larger operations.
Automatic Bottling Machine
Automatic Bottling Of Finished Oil
Walnut Oil Processing Plant Equipment Suppliers
Choosing Guance Machinery‘s Walnut Oil Processing Plant Equipment Suppliers is essential for the long-term success of your business.
Quality and Durability: The equipment is made from high-quality materials and designed for long-term performance.
After-Sales Support: We will provide one-stop solutions, including installation, training, and maintenance services eto.
Customization
Final Product
1. Walnut Oil: Premium refined oil used for cooking, frying, and salad dressings, known for its rich flavor and healthy omega-3 fatty acids.
2. Walnut Oil Cake/Meal: High-protein by-product (up to 40%) from oil extraction, commonly used as animal feed, especially for poultry, livestock, and pets.
3. Walnut Oil Soapstock: By-product of oil refining, rich in unsaponifiable matter, used for biodiesel production, animal feed, and in industrial applications.
4. Walnut Shells: Carbon-neutral biomass fuel, ideal for power generation, heating, and other industrial applications, including the production of activated carbon.
Quality Indicators of refining Walnut Oil
| Item | Unit | Edible Grade 1 | Edible Grade 2 |
|---|---|---|---|
| Free Fatty Acid (FFA) | % | ≤ 0.05 | ≤ 0.10 |
| Moisture & Impurities | % | ≤ 0.05 | ≤ 0.10 |
| Color (Lovibond 5¼") | R | ≤ 2.0 | ≤ 3.0 |
| Cloud Point | °C | ≤ 4 | ≤ 6 |
| Peroxide Value | meq O₂/kg | ≤ 0.5 | ≤ 1.0 |
| Iodine Value | g I₂/100g | ≥ 100 | ≥ 95 |
| Saponification Value | mg KOH/g | 190-195 | 185-200 |
Frequently Asked Questions About Walnut Oil Processing Solutions
Q1: Is cold-pressed walnut oil always better?
A: Cold pressing preserves more flavor and some nutrients, suitable for small-batch processing of special oils.
Q2: How to decide refinery scale?
A: Base it on forecasted % of refined vs unrefined product and on seasonal throughput.
Q3: What about walnut residual cake?
A: Walnut cake still contains useful oil and protein — options: animal feed or further solvent extraction.
Ready to build your walnut oil mill?
Contact us for a free consultation and equipment quote within 24 h. We offer services ranging from oil presses to production lines and complete plant construction!
Request a quote now!
📩 Get Your Free Quote Today
Contact us today to discuss your project, capacity requirements, and target materials. Our team will reply within 24 hours with a customized proposal. You can also reach us directly at guanceoilmachinery@gmail.com — we are here to help!
