Skip to main content
Edible Oil Filtration & Refining Systems
Cocoa, Shea, Palm Oil & Oilseed Processing

Edible Oil Filtration & Refining Systems

An edible oil refining system turns filtered crude vegetable oil into a clean, bland, stable oil for retail or food-industry sale, using degumming, neutralisation, bleaching and deodorisation as the grade demands.

Request a QuoteWhatsApp

Product Categories

Talk to Kadali Africa Ventures

Send your raw material, product and capacity for a technical proposal.

Contact Kadali

Related Products

Plate-and-frame filter press with stainless-steel piping in a clean processing hall; the same type of press filters edible oils

Edible Oil Filtration & Refining Systems

It takes crude oil from any pressing or solvent extraction line, so the first things a buyer must settle are the crude's free fatty acid level, colour, gum and wax content and moisture, and which grade will be sold: filtered crude, degummed oil, or fully refined, bleached and deodorised oil. Each added stage brings capital cost, steam, vacuum, chemicals and effluent, so the grade chosen shapes the plant more than the throughput does. The refining route matters too. Chemical refining uses caustic soda to remove free fatty acids and leaves soapstock to dispose of, while physical refining strips them with steam under vacuum and suits oils that can be degummed very well. Batch plants suit small volumes and frequent oil changes; continuous lines suit steady, single-oil volume. This page covers the cleaning and refining stage only. Pressing and extraction are dealt with on the pages for each oilseed.

Refining removes, in a fixed order, the components that make crude oil dark, unstable or unpleasant. Degumming removes phospholipids with water or acid, because gums cause losses in neutralisation and darken the oil in later stages. Neutralisation with caustic soda turns free fatty acids into soap, which a centrifuge separates as soapstock before the oil is water-washed and dried. In physical refining this step is skipped and the deodoriser strips the free fatty acids instead, which is why the oil must arrive well degummed. Bleaching mixes the oil with bleaching earth, sometimes with activated carbon, under vacuum and then filters it; the earth type, moisture, temperature, contact time and vacuum all change the result. Oils that carry waxes, sunflower oil for example, are winterised by chilling and filtering so they stay clear on a cool shelf. Deodorisation passes steam through hot oil at low pressure to carry away odour and flavour compounds, so the vacuum system and steam supply decide how good this section is. Batch plants run every stage in turn in one or two vessels. Continuous lines add heat recovery and steadier quality but need steady feed, trained operators and more utilities. Settling and filtration alone, with a polishing filter, is a complete product line for a processor selling lightly cleaned oil.

Indicative Capacity Range

  • 100–5,000 litres oil/hour

Key Specification Inputs

FFA, colour, phospholipids, filtration grade and refining stages.

Technical Specifications

TechnologyFiltration and chemical or physical refining of crude vegetable oil
Working PrincipleGums, free fatty acids, colour bodies, waxes and odour compounds are removed in separate stages, each with its own separation step
Operating ModeBatch, semi-continuous or continuous, chosen by volume and how often the oil type changes
Refining StagesFiltration only, or any mix of degumming, neutralisation, bleaching, winterisation and deodorisation, chosen by the grade to be sold
DegummingWater or acid, chosen by the phospholipid level of the crude
Bleaching AdsorbentNatural or acid-activated earth, with optional activated carbon, chosen against free fatty acid, colour and contaminant targets
FiltrationPressure leaf, candle or plate-and-frame filters, plus a polishing filter before storage
DeodorisationSteam stripping under vacuum, in a batch vessel, a semi-continuous unit or a tray column
Contact MaterialStainless steel for hot, wet and chemical-contact parts; carbon steel can serve for crude oil storage
UtilitiesSteam or thermal oil, cooling water, vacuum, electric power, process water, caustic soda and bleaching earth
Waste StreamsSoapstock, wash water, spent earth and deodoriser distillate, each needing its own handling

Typical Process Route

1

Receiving, Settling and Filtering Crude Oil

Crude oil is settled to drop out meal fines and water, then filtered. A refining line needs a clean, dry feed, and solids carried forward foul heat exchangers and wear pumps.

2

Degumming

Water or acid brings the phospholipids out of the oil as gums, which a centrifuge removes. This stage protects the oil recovered in neutralisation, so the amount of gum in the crude sets its size.

3

Neutralisation or Physical Route

In chemical refining, caustic soda is mixed in and the soap formed is separated as soapstock, then the oil is washed and dried. Physical refining skips this and leaves free fatty acid removal to the deodoriser.

4

Bleaching

Bleaching earth, with activated carbon if needed, is mixed into the dry oil under vacuum to take out colour and trace contaminants. Clay grade, contact time and moisture all change the outcome.

5

Filtering Out the Spent Earth

Pressure leaf or candle filters remove the spent earth from the bleached oil. Filter area and cake handling often limit how fast a bleaching line can run.

6

Winterisation Where the Oil Clouds

Oils that carry waxes are chilled slowly so the waxes crystallise, then filtered. The cooling rate decides how well the filter runs, and the step is needed only for oils sold in cool conditions.

7

Deodorisation

Steam is passed through hot oil under low pressure to strip odour and flavour compounds, and free fatty acids in the physical route. Air leaks and weak vacuum show up as off-flavours and darker oil.

8

Polishing, Cooling and Storage

The finished oil is cooled, passed through a last polishing filter and stored in clean, closed tanks before packing. Cooling it quickly and keeping air away protects its shelf life.

Process & Equipment Modules

  • Crude oil receiving and settling tanks
  • Crude oil filter or strainer
  • Degumming reactor with acid or water dosing
  • Neutraliser with caustic dosing and centrifugal separator
  • Water-wash unit and vacuum dryer
  • Bleaching vessel with vacuum and earth dosing
  • Pressure leaf or candle filters for spent earth
  • Winterisation chiller and wax filter, where needed
  • Deodoriser with stripping steam and vacuum ejectors
  • Heat exchangers and heat-recovery section
  • Polishing filter and finished-oil storage
  • Soapstock tank and effluent handling

Plant Output

Refined, bleached and deodorised edible oilFiltered or degummed oil as an intermediate gradeSoapstock from chemical refiningSpent bleaching earthDeodoriser distillate

Applications

  • Refined sunflower, groundnut or soybean oil for bottles, jerrycans and bulk tankers
  • Bleached and deodorised palm oil for cooking-oil blends and frying fat
  • Winterised oil that stays clear in cool shops and kitchens
  • Frying oil for snack, bakery and fast-food makers that need a neutral taste
  • Degummed oil sold on to a central refinery
  • Filtered or polished pressed oil sold with little or no chemical refining
  • Upgrading oil from several small mills to one common grade

Key Features

  • Route Matched to the Crude

    Chemical refining copes with most crude oils, including poor ones. Physical refining saves chemicals and soapstock but needs a well-degummed feed and a stronger deodoriser.

  • Gum Removal Ahead of Neutralisation

    Seed oils with a high gum content lose oil in neutralisation. A degumming stage sized for the real phospholipid level protects recovery and keeps the soapstock manageable.

  • Bleaching Specified, Not Defaulted

    Earth type, dosage, temperature, contact time and vacuum belong in the specification. Acid-activated earth can raise free fatty acids and form MCPD esters, which is why natural earth is often preferred.

  • Vacuum and Steam Sized for Deodorising

    The ejectors or vacuum pumps, the stripping steam and the heat recovery decide the quality and running cost of the final section. They deserve close reading in any proposal.

  • Waste Streams Planned From the Start

    Soapstock, wash water, spent earth and deodoriser distillate all leave the plant. Knowing where each goes keeps effluent from becoming the site's biggest problem.

  • Staged Build-Up

    A processor can begin with settling and filtration and add degumming, bleaching or deodorising later if the piping, utilities and layout are planned for them.

Country Pages for Edible Oil Filtration & Refining Systems

This product is listed on the pages of the countries below, each with its own enquiry route. Where Kadali has no office in a country, enquiries are handled from the Accra office.

Related Products

Frequently Asked Questions

What information is needed to size Edible Oil Filtration & Refining Systems?
A laboratory analysis of the crude oil comes first: free fatty acid, colour, phosphorus or gum content, wax content, moisture and impurities. Then state which oil or oils will be refined, the grade you will sell, the litres of oil per hour and the hours per day, and whether the oil type changes between runs. Steam, cooling water, vacuum, power and a route for soapstock and wash water complete the list.
What capacity range does Edible Oil Filtration & Refining Systems cover?
The indicative capacity range is 100–5,000 litres oil/hour. It is stated on an oil basis per hour, so restate your own volume on that basis and say how many hours a day the plant will run.
Should I choose chemical or physical refining?
Chemical refining uses caustic soda, tolerates a wide range of crude quality and is the usual choice for seed oils and mixed or poorer crudes, but it makes soapstock and wash water. Physical refining uses no caustic and gives no soapstock, but the oil must be degummed very well and the deodoriser has to remove all the free fatty acids. It suits steady, single-oil duty such as palm oil refining. Ask for both routes to be priced against your own crude analysis.
Can I sell filtered oil without full refining?
Yes, and many small processors do. Settling, filtration and a polishing filter produce a clear, lightly cleaned oil that keeps its natural taste and colour, which some markets prefer. Its limits are higher free fatty acids, gum and colour than refined oil, and a shorter shelf life. Refining stages can be added later if the layout leaves room, so the first line should be planned with the full sequence in mind.
Is chemical refining suitable for low-quality crude oil?
Alkali refining can handle most crude oils, including poor ones, with castor oil the notable exception. It does not remove the need for preparation. Seed oils rich in gums lose oil in neutralisation, so degumming ahead of it is advised. Ask any supplier which range of free fatty acid, gum and moisture the line is designed for, and what happens to the oil loss when the crude falls outside it.
What are the drawbacks of acid-activated bleaching earth?
Acid-activated earths bleach strongly but can raise free fatty acids and form MCPD esters, which is why many refineries prefer natural earths or blends. The clay grade belongs in the bleaching specification with temperature, contact time and vacuum, not in a consumables list. Earth dosage also drives cost, because spent earth holds oil and has to be disposed of, so a filter that drains the cake well saves oil.
Why is sunflower oil winterised?
Sunflower oil carries natural waxes that turn the oil cloudy when it is cool, which looks poor on a shelf or in a cold store. Winterisation chills the oil slowly so the waxes form crystals that a filter can take out. It is not needed for oils sold only in warm conditions. If your product is sunflower oil, see the sunflower oil processing plant page for the pressing side.
Can refining lower benzo(a)pyrene in edible oil?
Refining can reduce polycyclic aromatic hydrocarbons, benzo(a)pyrene among them, by a large margin, and activated carbon in the bleaching stage is the usual extra measure where seed has been dried over direct flame. Refining is still only one control. Drying seed with clean hot air rather than smoke keeps the load in the crude oil low, and a refinery that must clean up heavily contaminated oil pays for it in carbon, losses and yield.
How do I request a proposal for Edible Oil Filtration & Refining Systems?
Use the Request a Quote page and describe your project. Have your crude oil analysed, decide the oil grade you will sell and tell the supplier your daily volume.

Enquire about Edible Oil Filtration & Refining Systems

Send your raw material, target product and capacity to Kadali Africa Ventures for a technical proposal.

Request a QuoteWhatsApp