What Is o-Xylene (CAS 95-47-6)?
Phthalic anhydride (C8H4O3) is manufactured through the catalytic vapor-phase oxidation of o-xylene (CAS 95-47-6) (C8H10) with air, carried out in a fixed-bed, multi-tubular reactor. The process uses a catalyst composed of vanadium pentoxide (V2O5) and titanium dioxide (TiO2), operating at a temperature of 340–450°C. The core chemical reaction is:
C8H10+3O2→C8H4O3+3H2O
o-Xylene (ortho-xylene) Properties
| Physical Properties | |
| Molecular weight | 106.17 |
| Boiling point | 144.41°C |
| Vapor pressure | 6 Torr at 20°C |
| Freezing point | -25.18°C |
| Refractive index | 1.5054 at 20°C |
| Density | 0.8802 g/mL (7.346 lb/gal) at 20°C |
| 0.8760 g/mL (7.311 lb/gal) at 25°C | |
| Dielectric constant | 2.57 at 20°C |
| Dipole moment | 0.45 D at 25°C |
| Solvent group | 7 |
| Polarity index (P') | 2.5 |
| Eluotropic value on alumina | 0.26 |
| Viscosity | 0.81 cP at 20°C |
| Surface tension | 30.03 dyn/cm at 20°C |
| Solubility in water | 0.018% at 25°C |
| Regulatory and Safety Data | |
| DOT Hazard Class | 3, Flammable Liquid |
| Packing Group | II |
| UN Identification Number | UN1307 |
O-xylene is used as a feedstock for phthalic anhydride production:
- It is used to manufacture plasticisers (for PVC) and polyester and alkyd resins.
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