Batch vs. continuous oil refining: What's the difference for a small edible oil factory?

Choosing the right oil refining method is one of the most important decisions for a small edible oil factory (1–20 TPD). The three options—batch, semi-continuous, and full-continuous refining—differ significantly in capacity, investment cost, operational complexity, and product consistency. For small edible oil factories, batch refining offers the lowest entry cost and maximum flexibility, while semi-continuous refining provides a practical upgrade path with better efficiency and FFA recovery. Full-continuous refining (30–1200 TPD) is engineered for large-scale operations and is not suitable for small-scale production. Therefore, Glory Oiltech (Henan Glory) compares batch and semi-continuous refining based on key parameters to help you make an informed choice.

Three edible oil refining methods

Understanding the Three Refining Modes

Our oil refining solution is generally classified into three modes based on production scale and automation level:

Key point: When people say “continuous refining,” they may mean semi-continuous, full-continuous, or both. For a small factory operating at 1–20 TPD, understanding this distinction is crucial because only batch and semi-continuous are practical options—full-continuous is engineered for large-scale operations well above your production scale.

Batch Refining: The Standard Choice for Small Factories

Batch refining processes oil in discrete batches. Each stage—degumming, deacidification, bleaching, and deodorizing—is carried out in separate tanks, one step at a time. Based on Glory Oiltech's engineering data, a complete batch cycle typically takes 18–24 hours depending on oil type, FFA content, and specific equipment configuration. In practice, batch refining systems are reliable and versatile, but not designed for sustained large-scale production.

Batch type edible oil refining machine

Equipment Configuration

(1) A typical batch edible oil refining line includes:

(2) Refining tank (degumming & deacidification)

(3) Bleaching tank

(4) Deodorizing tank

(5) Leaf filter

(6) Vacuum system

(7) Thermal oil heater (or steam generator)

(8) Cooling tower (outdoor)

Advantages

Low investment cost—ideal for startups and small budgets

Flexible oil switching—easy to clean and switch between different crude oil types (palm, soybean, sunflower, etc.)

Simple operation—minimal PLC automation; workers can be trained quickly

Small footprint—fits in compact workshops; low building height requirements

Limitations

Higher per-ton consumption—steam, water, and chemicals per ton of oil are significantly higher than continuous methods

Higher soapstock oil content—approximately 40% oil retained in soapstock (vs. approximately 30% in continuous)

Labor intensive—more manual operation required

Best For

Small factories with 1–20 TPD capacity, multi-oil-type processing needs, limited budgets, or those in the early stages of market testing.

Batch type edible oil refining machine

Semi-Continuous Refining: The Smart Upgrade Path

Semi-continuous refining is a hybrid approach that combines the flexibility of batch processing with the efficiency of continuous operation. Specifically:

- Degumming, deacidification, and bleaching are carried out in batch mode (using tanks)

- Deodorization uses a continuous deodorization tower instead of a batch deodorizer

This design allows the factory to recover valuable Free Fatty Acids (FFA) as a by-product while maintaining operational flexibility. From an engineering perspective, the semi-continuous configuration offers the best balance of investment, efficiency, and flexibility for growing operations.

Semi-continuous edible oil refining machine

Equipment Configuration

A typical semi-continuous line includes:

(1) Refining tank (degumming & deacidification)

(2) Bleaching tank

(3) Leaf filter

(4) Deaeration tank

(5) Plate heat exchanger

(6) Cooler

(7) Continuous deodorization tower

(8) FFA collector (for fatty acid recovery)

(9) Thermal oil heater system

(10) Steam boiler system

(11) Vacuum system

Advantages

Higher energy efficiency—continuous deodorization with heat recovery via plate heat exchangers

FFA recovery revenue—fatty acids can be sold as a valuable by-product

Lower investment than full-continuous—significant cost savings on equipment and installation

Better oil quality consistency—continuous deodorization provides more stable results than batch deodorizing

Limitations

Hybrid complexity—managing both batch and continuous sections requires more skilled operators

Not fully automated—still requires manual intervention for degumming/deacidification/bleaching stages

Best For

Factories with 5–30 TPD capacity that want to upgrade from batch processing, recover FFA revenue, and improve efficiency without the massive capital outlay of a full-continuous line.

Semi-continuous edible oil refining machine

Comparison of Batch and Semi-Continuous Oil Refining

The following table summarizes the key differences based on Glory Oiltech's engineering data:

Project References

Glory Oiltech has delivered refining solutions across Africa, Southeast Asia, and South America. The following are representative Project References:

Common Selection Mistakes to Avoid

Choosing equipment based on price alone—without factoring in long-term operating costs, yield losses, and energy consumption can cost you far more than the initial savings.

Installing continuous systems without a stable crude oil supply—continuous refining requires consistent feedstock; intermittent supply will cause production bottlenecks and quality inconsistency.

Ignoring future expansion when designing the initial plant—reserving pipeline, electrical, and control interfaces early can significantly reduce upgrade costs down the line.

Which One Should Your Small Edible Oil Factory Choose?

For a small edible oil factory (1–20 TPD), here is our recommendation:

Choose Batch Refining If:

- Your daily capacity is 1–20 TPD

- You have a limited initial budget

- You plan to process multiple oil types (palm, soybean, sunflower, etc.)

- You prefer simple operation with minimal training

- You are testing the market or operating at a small scale

Choose Semi-Continuous Refining If:

- Your daily capacity is 15–20 TPD (upper end of small factory range)

- You want to recover FFA as an additional revenue stream (especially if your crude oil has FFA above 5%)

- You need better energy efficiency than batch provides

Comparison of batch and semi-continuous oil refining

Frequently Asked Questions

Ready to Start Your Edible Oil Refining Project?

Ready to get started? Contact Glory Oiltech today for a free consultation and customized quotation. Tell us about your oil type, expected capacity, and budget — our engineering team will recommend the optimal edible oil refining solution for your project, whether it’s batch, semi-continuous, or full-continuous design.