Overview
Activated bentonite decolorizing agent is a processed form of natural bentonite clay, treated with mineral acids (e.g., sulfuric or hydrochloric acid) to enhance its adsorption properties. The activation process creates a microporous structure with a high surface area (typically 150–300 m²/g), enabling effective removal of pigments, phospholipids, and oxidation products. Primarily used in the edible oil industry, it also serves in petrochemical refining and environmental applications. Its efficacy depends on factors like activation strength, particle size distribution, and montmorillonite content (usually 80–90%).
Physical and Chemical Properties
The agent exhibits a layered aluminosilicate structure with exchangeable cations (e.g., H⁺) post-activation, contributing to its acidity. Its porosity allows selective adsorption of polar molecules, such as chlorophyll and carotenoids, while leaving triglycerides unaffected. Key metrics include decolorization power (measured by Lovibond color scale reduction), free fatty acid (FFA) absorption, and filtration speed. Typical bulk density ranges from 0.6–0.9 g/cm³, and its oil retention capacity is approximately 30–50% by weight.
Main Applications
In edible oil refining, the agent is used in the bleaching stage to remove color bodies and trace metals, improving oil stability and appearance. Soybean, palm, and rapeseed oils are common substrates. It also degums crude oils by adsorbing phospholipids. Petrochemical applications include lubricant base oil purification and wax decolorization. Environmental uses involve treating industrial wastewater containing dyes or heavy metals, leveraging its ion-exchange capacity.
Safety and Storage
While non-flammable, the acidic nature of activated bentonite requires handling with nitrile gloves and dust masks to prevent irritation. Storage silos or bags should be sealed to prevent moisture absorption, which reduces effectiveness. Spent material may contain adsorbed contaminants and should be disposed of as industrial waste. Neutralization with alkaline agents (e.g., lime) is recommended before landfill disposal.
B2B Procurement Guide
Buyers should prioritize suppliers providing material safety data sheets (MSDS) and batch-specific quality certificates. Key specifications to verify include decolorization rate (≥90% for premium grades), residual acid content (≤0.3%), and particle size (80–200 mesh for optimal filtration). Bulk purchases (20+ tons) often qualify for discounts. Consider regional logistics costs, as moisture-sensitive bentonite requires dry container shipping. Sample testing with actual feedstock is advised to confirm performance.
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