Complete Peanut Oil Pressing Guide

Introduction

Peanut oil is one of the most popular cooking oils globally, prized for its high smoke point, neutral flavor, and nutritional benefits. This comprehensive guide covers every aspect of peanut oil production, from raw material selection through pressing to finished oil.

Raw Material Preparation

Understanding Peanut Types

Peanut Type	Characteristics	Best For
Runner	Medium-sized, uniform kernels	General oil production
Virginia	Large kernels, high quality	Premium oil, export
Spanish	Small kernels, high oil content	High yield production
Valencia	Multiple kernels per pod	Specialty markets

Raw Material Requirements

1. Moisture Content: 7-9% for cold pressing, 5-7% for hot pressing
2. Oil Content: 45-55% (good quality peanuts)
3. Impurity Level: Less than 0.5%
4. Aflatoxin Level: AFB1 ≤ 20 µg/kg (retail compliance)

Processing Steps

Step 1: Shelling

• Required for all peanut oil production
• Target: 95%+ shell removal rate
• Equipment: Disc dehuller or hammer mill

Step 2: Cleaning

• Remove stones, metal, and other hard impurities
• Magnetic separation for metal contaminants
• Gravity separation for lighter impurities

Step 3: Sorting

• Visual inspection for moldy or damaged kernels
• Optional: Optical sorting for color and quality

Hot Pressing Process

Hot Pressing Overview

Hot pressing is the most common method for peanut oil production, offering higher yields and faster processing times.

Equipment Configuration

Complete Hot Press Line:

1. 5 x Electric Heating Flat Pans (100 kg/batch each)
2. 5 x HN325 Hydraulic Oil Press (100 kg/batch each)
3. Pneumatic Multi-layer Filter Press
4. Settling Tanks
5. Stainless Steel Storage Tanks

Production Parameters

Parameter	Specification
Pre-pressing Rate	~500 kg/h
Roasting Temperature	160-180°C
Roasting Time	25-35 minutes
Pressing Cycle	30-40 minutes/batch
Total Cycle (2 barrels)	~1.5 hours
System Pressure	60 MPa
Motor Power	2.2 kW

Expected Yields

Material Condition	Oil Yield	Residual Oil
Good quality kernels	45-55%	6-8%
Average quality kernels	40-45%	8-10%

Cold Pressing Process

Cold Pressing Overview

Cold pressing preserves the natural flavor and nutritional properties of peanut oil, producing a premium product with higher market value.

Equipment Configuration

Cold Press Line:

1. HN355, HN426, HN480, or HN500 Hydraulic Oil Press
2. Precision Temperature Control System
3. Pneumatic Multi-layer Filter Press
4. Temperature-Controlled Storage Tanks

Production Parameters

Model	Pressing Force	Cycle Time	Best For
HN355	370 tons	~2 hours/batch	Entry-level cold press
HN426	500 tons	~2 hours/batch	Standard cold press
HN480	560 tons	~2 hours/batch	High-volume cold press
HN500	620 tons	~2 hours/batch	Premium cold press

Cold Press Advantages

• Preserves natural peanut aroma
• Retains vitamin E and resveratrol
• Product premium: 2-3 times higher market value
• No chemical processing

Quality Control

Aflatoxin Management

Aflatoxin contamination is a critical concern in peanut oil production. Implement a comprehensive control system:

Control Points:

Stage	Control Measure	Acceptance Standard
Raw Material	Batch inspection	AFB1 ≤ 20 µg/kg
Sorting	Optical color sorting	Remove moldy kernels
Roasting	Temperature monitoring	160-180°C
Filtration	Activated carbon adsorption	AFB1 ≤ 20 µg/kg
Finished Oil	Batch testing	AFB1 ≤ 20 µg/kg (GB 2761)

Oil Quality Standards

Parameter	Standard
Acid Value	≤ 1.0 mg KOH/g
Peroxide Value	≤ 10 mmol/kg
Moisture	≤ 0.1%
Impurities	≤ 0.05%

Post-Pressing Processing

Filtration System

Multi-stage Filtration:

1. Primary Filtration: 100-200 mesh
2. Fine Filtration: 200-300 mesh
3. Polishing: 300-500 mesh (optional for premium oil)

Filtration Methods:

• Plate filter press
• Bag filter
• Centrifugal filter
• Pneumatic multi-layer filter

Oil Settling and Storage

Settling Process:

1. Allow oil to settle 24-48 hours
2. Particles sink to bottom
3. Decant clear oil from top

Storage Requirements:

• Stainless steel tanks
• Temperature ≤ 25°C
• Protected from light
• Proper ventilation

By-Product Utilization

Peanut Cake

Peanut cake is a valuable by-product with multiple uses:

Application	Description
Animal Feed	High protein content (45-50%)
Fertilizer	Organic nitrogen source
Human Consumption	After further processing
Industrial	Extraction of other components

Cake Handling Options

1. Direct collection and bagging
2. Temporary storage bins
3. Integrated crushing for feed
4. Pelletizing for easy handling

Production Line Layout Considerations

Space Requirements

Scale	Area	Height
Small	50-80 m²	3 m
Medium	100-150 m²	3-4 m
Large	200-300 m²	4-5 m

Workflow Design

Optimal Flow:

1. Raw material receiving →
2. Shelling →
3. Cleaning →
4. Roasting (hot press) →
5. Pressing →
6. Filtration →
7. Settling →
8. Storage →
9. Packaging

Equipment Placement

• Presses in central location
• Filtration near presses for efficient transfer
• Storage tanks away from direct sunlight
• Easy access for maintenance and cleaning

Conclusion

Peanut oil production requires careful planning and attention to detail at every stage. By understanding the complete production process, from raw material preparation to finished oil quality control, you can establish a successful and profitable peanut oil business. Haonuo hydraulic oil presses provide the reliability and efficiency needed for both hot and cold pressing applications.