The Bleaching Tank is a core piece of equipment in the edible oil refining process. It is mainly used to remove pigments, trace metals, residual soap, and other impurities from crude oil through adsorption with activated clay or bleaching earth. The bleaching stage significantly improves oil color, stability, and quality, making it suitable for further refining and deodorization.

The bleaching tank is generally applied in oil refining lines with a processing capacity of 5–50 tons per day, and in some cases can reach up to 80 TPD. For larger-scale refining plants, a continuous decolorizing tower is usually recommended instead.

Applications in Oil Refining Process

The bleaching tank is applied in refining lines for a wide range of edible oils, including soybean oil, rapeseed oil, sunflower seed oil, cottonseed oil, peanut oil, palm oil, corn germ oil, and rice bran oil.

It is typically installed after neutralization and washing, and before the deodorization section of the refining plant.

Situations where bleaching is necessary:

1. Oils with deep natural pigments such as carotenoids in palm oil.
2. Oils containing chlorophyll, gossypol, or other undesirable components.
3. Oils requiring high-quality transparent appearance for bottling and retail.

Product Features

Vacuum Operation – Ensures thorough mixing of oil and bleaching earth, preventing oxidation.

Steam Heating System – Provides stable temperature control for effective pigment removal.

Agitation Design – Uniform mixing guarantees maximum contact between oil and adsorbent.

Easy Discharge & Cleaning – Facilitates smooth removal of spent bleaching earth.

Customizable Capacity – Available for small- to large-scale edible oil refineries.

Why Use a Bleaching Tank?

Improved Oil Appearance – Effectively removes coloring substances for clear, bright oil.

Enhanced Stability – Reduces pro-oxidant metals and pigments, extending shelf life.

Food-Grade Safety – Eliminates harmful impurities that affect oil quality and safety.

Process Flexibility – Suitable for continuous or batch oil refining systems.

Cost-Effective Operation – Efficient bleaching earth utilization reduces processing cost.