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CAS 3238-40-2 (2,5-Furandicarboxylic acid, abbreviated as FDCA), MF: C₆H₄O₅, MW: 156.09. It is a furan derivative with an aromatic heterocyclic structure. The furan ring and carboxyl group in its molecule can participate in various reactions, such as esterification, amidation, and condensation, and can undergo polymerization reactions with diols to form polyesters. Its core value lies in its ability to replace petroleum-based terephthalic acid (PTA) in the production of green polymers, serving as a key intermediate linking biomass resources with sustainable materials.
| Item | Specification |
| Melting point | >300°C |
| Boiling point | 419.2±30.0°C (760 mmHg) |
| Density | 1.6–1.74 g/cm³ (25°C) |
| Flash point | 207.3 ± 24.6 °C |
| Vapor pressure | 0.0 ± 1.0 mmHg at 25°C |
| Refractive index | 1.6400 (estimate) |
| Acid dissociation constant (pKa) | 2.28 ± 0.10 (Predicted) |
| Water solubility | Sparingly soluble in water (solubility approx. 0.26 g/L at 25°C); soluble in strongly alkaline aqueous solutions. |
| Solubility in organic solvents | Slightly soluble in methanol and ethanol; soluble in dimethyl sulfoxide (DMSO) and N,N-dimethylformamide (DMF). |
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