DTPA Chelating Agent (Diethylenetriaminepentaacetic Acid)
CAS Number: 67-43-6
DTPA (diethylenetriaminepentaacetic acid) is a powerful chelating agent used in pulp bleaching to sequester transition metal ions such as manganese, iron, and copper that catalytically decompose hydrogen peroxide. Pre-treatment of pulp with DTPA before alkaline peroxide bleaching improves peroxide efficiency and brightness gain. It is widely used in both mechanical and chemical pulp bleaching systems.
Technical Specifications
| pH | 10.5–12.0 |
| appearance | Colorless to pale yellow liquid (sodium salt solution) |
| density (g/mL) | 1.25–1.30 |
| DTPA content (%) | 40±2 |
Applications
- Pre-treatment chelation before alkaline peroxide bleaching
- Metal ion sequestration in TMP/CTMP peroxide bleaching
- Chelating agent in kraft pulp bleaching (Q-stage)
- Heavy metal control in paper mill process water
- Deinking peroxide system metal deactivation
Key Features
- Strong chelation of Mn²⁺, Fe³⁺, and Cu²⁺ ions at trace levels
- Dramatic improvement in peroxide consumption efficiency
- Water-soluble sodium salt for easy dosing into pulp slurry
- Compatible with all standard bleaching chemical sequences
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