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Food Chemistry
Bleaching Earth (Activated)
Formula:
Al₂O₃ ⋅ 2SiO₂ ⋅ 2H₂O
GOST/CAS:
CAS 70131-50-9
Activated Bleaching Earth is a highly efficient natural sorbent based on bentonite clays, which undergoes thermal and chemical (acid) activation to significantly increase its specific surface area and porosity. The product is a fine, free-flowing powder ranging from white to light gray in color. Due to its exceptional adsorption properties, bleaching earth is indispensable in the food industry for the deep refining, clarification, and deodorization of vegetable oils, animal fats, and other liquid food products.
Applications
Vegetable Oil Refining: Used as a key component for bleaching sunflower, soybean, rapeseed, palm, and corn oils. It effectively removes pigments (chlorophyll, carotenoids), reducing color index values to regulatory standards.
Animal Fat Purification: Applied in the production of margarines, confectionery fats, and cooking shortenings. It removes undesirable odors, soap traces, phospholipids, and oxidation products, significantly improving organoleptic properties.
Winemaking and Juice Production: Serves for the clarification and stabilization of wine materials, fruit juices, and syrups. It binds and precipitates protein hazes, tannins, and colloidal impurities.
Toxin and Heavy Metal Removal: In complex raw material purification processes, it efficiently sorbs trace amounts of heavy metals, pesticides, and mycotoxins, guaranteeing the safety of the final food product.
Key Advantages
High Selective Adsorption: Selectively extracts carotenoids, chlorophyll, and gummy substances without altering the quality characteristics or fatty acid composition of the oil being treated.
Enhanced Storage Stability: Binds pro-oxidant metals (such as iron and copper), which significantly retards oxidation processes and extends the shelf life of the finished product.
Excellent Filtration Properties: The optimized particle size distribution ensures a high filtration rate and the formation of a dense filter cake, minimizing oil retention losses in the cake.
Food Grade Safety: The product is completely inert, chemically pure, does not release harmful substances, and is entirely removed from the finished product during filtration, meeting the strictest food industry standards.
Storage & Transportation
- Store in dry, covered, and well-ventilated warehouses in tightly closed original packaging. The product is highly hygroscopic (actively absorbs moisture and foreign odors from the air).
- Protect from water, moisture, and atmospheric precipitation. Damage to the packaging can result in a loss of adsorption efficiency.
- Transportation is permitted by all types of covered transport in compliance with standard freight regulations. The material is non-flammable, non-combustible, and non-explosive.
- Shelf Life: 2 years from the manufacturing date, provided the packaging integrity is maintained.
Technical Specifications
Appearance
Fine powder, ranging from white to light cream or gray
Specific Surface Area
180-240m²/g
Moisture Content
≤ 8.0-12.0%
Bulk Density
500-700g/l
pH (10% aqueous suspension)
3.0-5.5
Sieve Residue (0.075 mm)
≤ 10.0%
Supply info
- 25 kg multi-layer paper kraft bags with an inner polyethylene liner (for standard batches).
- 500 – 1000 kg flexible intermediate bulk containers (FIBC / Big-Bags) (for large-scale industrial consumers).