Product Description of Phosphoric Acid (CAS#78-42-2)
This organophosphate compound finds widespread deployment across the chemical sector.It is an ester with a central phosphoryl group attached to three 2-ethylhexyloxy chains, synthesized from orthophosphoric acid and 2-ethylhexanol, consisting only of carbon, hydrogen, oxygen and phosphorus. Appearing as a colourless to pale yellow oily liquid with extremely low water solubility and complete miscibility with most organic solvents, this compound boasts a low melting point of −70 °C, high flash point, low volatility and excellent thermal and hydrolysis stability under neutral conditions, making it widely applied across the chemical industry as a halogen-free flame retardant, low-temperature polymeric plasticizer and solvent extractant, while its most vital commercial use serves as the primary working solvent in anthraquinone-process hydrogen peroxide production thanks to its strong solvency for hydroanthraquinone derivatives and favourable hydrogen peroxide distribution coefficient between aqueous and organic phases, ensuring steady extraction efficiency and safe continuous industrial operation.
When deployed for trioctyl phosphate (TOP) synthesis, the material acts as the primary solvent for hydroanthraquinone-based working systems. It features strong solubilizing power for hydroanthraquinone derivatives, together with an ideal partition coefficient for hydrogen peroxide between aqueous and organic solvent layers. Coupled with its high boiling point and elevated flash point, these inherent properties deliver reliable extraction performance while maintaining stable, secure operation throughout production.
PHOSPHORIC ACID Chemical Properties
| Melting point | -70°C |
| Boiling point | 215 °C4 mm Hg(lit.) |
| Density | 0.92 g/mL at 20 °C(lit.) |
| Vapor pressure | 2.1 mm Hg ( 20 °C) |
| Refractive index | n20/D 1.444(lit.) |
| Fp | >230 °F |
| Storage temp | Store below +30°C. |
| Solubility | <0.001g/l |
| Form | Liquid |
| Specific Gravity | 0.93 |
| Color | Colourless |
| PH | 7 (H2O, 20℃) |
| Water Solubility | <0.1 g/100 mL at 18 ºC |
| BRN | 1715839 |
| CAS DataBase Reference | 78-42-2(CAS DataBase Reference) |
| NIST Chemistry Reference | 2-Ethylhexanol phosphate (3:1)(78-42-2) |
| EPA Substance Registry System | Tris(2-ethylhexyl) phosphate (78-42-2) |
Safety Information
| Hazard Codes | Xi |
| Risk Statements | 38 |
| Safety Statements | 23-43-24/25 |
| WGK Germany | 2 |
| RTECS | MP0770000 |
| Autoignition Temperature | 370 °C |
| TSCA | Yes |
| HS Code | 29190090 |
| Hazardous Substances Data | 78-42-2(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 37000 mg/kg LD50 dermal Rabbit 20000 mg/kg |
Product Application of Phosphoric Acid (CAS#78-42-2)
Widely adopted in anthraquinone-based hydrogen peroxide production, this product is an ideal alternative solvent to hydroterpineol. It effectively improves the concentration and purity of finished hydrogen peroxide, stabilizes production quality and reduces solvent consumption, supporting cost-effective and stable industrial production.
For PVC processing and manufacturing, this product acts as a high-performance cold-resistant plasticizer. It significantly enhances the low-temperature flexibility and toughness of PVC products with better cold resistance than conventional adipate plasticizers, ideal for flexible and low-temperature-resistant PVC materials.
Additionally, the product boasts versatile industrial values, serving as a halogen-free flame retardant, polymer modifier, hydrometallurgical extractant, and functional oil additive to optimize material performance and industrial processing efficiency.
