The physical properties of 2-Phosphonobutane-1,2,4-tricarboxylic acid, sodium salt (PBTC·Na4) depend on its physical form. Key properties are summarized below.
Key Physical Properties of PBTC·Na4
Property Value / Description
Appearance Colorless to light yellow transparent liquid or white crystalline powder
| Items | Index | |
|---|---|---|
| Appearance | Colorless to yellowish transparent liquid | White powder |
| Active content (PBTC), % | 30.0min | 68.0-72.0 |
| Active content (PBTC•Na4), % | 40.0min | 90.0-95.5 |
| Fe, mg/L | – | 20.0 max |
| Density (20℃), g/cm3 | 1.35min | – |
| pH (1% water solution) | 9.0-12.0 | 6.0-8.0 |
| Bulk Density (kg/m3) | – | 400-700 |
| Mean Particle Size (microns) | – | 140-220 |
| Phosphoric acid (as PO₄³⁻) Content, % | – | 23.9-25.3 |
Hygroscopic Nature Yes, the solid form is easily hygroscopic (absorbs moisture from the air)
Important Application Notes
Product Specifications: The “Active Ingredient Content” and “Total Phosphorus” values differ between liquid and solid forms. For example, solid PBTC·Na4 typically has an active content ≥85.0% (as PBTC·Na4), while the liquid form is ≥40.0% .
Form Selection: The liquid form is often preferred for ease of handling and precise dosing in industrial applications, while the solid form may be more economical for transport and storage if the user has appropriate dissolution and handling equipment.