Products Description of o-Xylene CAS#95-47-6
o-Xylene, also named ortho-xylene or 1,2-Dimethylbenzene, has the molecular formula C₈H₁₀. It is a clear, colourless aromatic hydrocarbon liquid with a distinctive sweet aromatic odour. It is barely soluble in water but fully miscible with ethanol, ether and most other organic solvents.
This aromatic is refined from naphtha reforming streams and separated from mixed xylene isomers. It maintains stable chemical properties under normal ambient conditions and has a defined boiling point suitable for controlled oxidation reactions. It is highly flammable and volatile, and must be kept away from heat sources, sparks and open flames. It is a core petrochemical aromatic intermediate specially suited for phthalic anhydride synthesis.
o-Xylene Chemical Properties
| Melting point | -26--23 °C (lit.) |
| Boiling point | 143-145 °C (lit.) |
| density | 0.879 g/mL at 20 °C (lit.) |
| vapor density | 3.7 (vs air) |
| vapor pressure | <0.1 atm ( 21.1 °C) |
| refractive index | n20/D 1.505(lit.) |
| Fp | 90 °F |
| storage temp. | Store below +30°C. |
| solubility | water: partially soluble0.1705 g/L at 25°C |
| form | Clear liquid |
| pka | >15 (Christensen et al., 1975) |
| color | Colorless |
| Odor | Benzene-like; characteristic aromatic. |
| Odor Threshold | 0.38ppm |
| explosive limit | 1.0-7.6%(V) |
| Water Solubility | Sparingly soluble in water. (0.2g/L) |
| Thermal Conductivity | 0.1299 W/(m·K) at 25 ℃ |
| Specific Heat Capacity | Cp(liquid): 1.75 J/(g·K), at 25℃ |
| λmax | λ: 288 nm Amax: 1.00 λ: 300 nm Amax: 0.40 λ: 325 nm Amax: 0.05 λ: 350-400 nm Amax: 0.01 |
| Merck | 14,10081 |
| BRN | 1815558 |
| Henry's Law Constant | 14.0 at 45.00 °C, 16.4 at 50.00 °C, 19.0 at 55.00 °C, 21.3 at 60.00 °C, 26.3 at 70.00 °C (static headspace-GC, Park et al., 2004) |
| Dielectric constant | 2.5699999999999998 |
| Exposure limits | ACGIH TLV-TWA:20 ppm;TLV-STEL:150 ppm (adopted) OSHA PEL-TWA:100 ppm NIOSH REL-TWA:100 ppm (435 mg/m3);REL-STEL:150 ppm (655 mg/m3);IDLH:900 ppm |
| Stability: | Stable. Incompatible with oxidizing agents. Flammable. Hygroscopic. |
| Cosmetics Ingredients Functions | SOLVENT FRAGRANCE PERFUMING |
| InChI | 1S/C8H10/c1-7-5-3-4-6-8(7)2/h3-6H,1-2H3 |
| InChIKey | CTQNGGLPUBDAKN-UHFFFAOYSA-N |
| SMILES | Cc1ccccc1C |
| LogP | 3.16 at 20℃ |
| Surface tension | 29.86mN/m at 298.15K |
| CAS DataBase Reference | 95-47-6(CAS DataBase Reference) |
| NIST Chemistry Reference | Benzene, 1,2-dimethyl-(95-47-6) |
| EPA Substance Registry System | o-Xylene (95-47-6) |
| ECETOC JACC REPORT | o-Xylene (95-47-6) |
Safety Information
| Hazard Codes | Xn,T,F |
| Risk Statements | 10-20/21-38-39/23/24/25-23/24/25-11 |
| Safety Statements | 25-45-36/37-16-7 |
| RIDADR | UN 1307 3/PG 3 |
| OEB | A |
| OEL | TWA: 100 ppm (435 mg/m3), STEL: 150 ppm (655 mg/m3) |
| WGK Germany | 2 |
| RTECS | ZE2450000 |
| Autoignition Temperature | 867 °F |
| TSCA | TSCA listed |
| HazardClass | 3 |
| PackingGroup | II |
| HS Code | 29024100 |
| Storage Class | 3 - Flammable liquids |
| Hazard Classifications | Acute Tox. 4 Dermal Acute Tox. 4 Inhalation Aquatic Chronic 3 Asp. Tox. 1 Eye Irrit. 2 Flam. Liq. 3 Skin Irrit. 2 STOT SE 3 |
| Hazardous Substances Data | 95-47-6(Hazardous Substances Data) |
Product Application of o-Xylene CAS#95-47-6
o-Xylene is the dominant industrial feedstock for catalytic oxidation to produce phthalic anhydride, which further serves to manufacture phthalate plasticizers, alkyd resins and unsaturated polyester resins widely used in PVC, coating and composite industries. It also acts as an efficient aromatic solvent for solvent-based paints, varnishes, printing inks and adhesive systems, helping dissolve resins and adjust formulation viscosity.
Besides, it is adopted for synthesizing o-toluic acid, agrochemical intermediates and dyestuff raw materials. It can be applied as a reference standard for chromatographic analysis and a component of high-octane fuel blends.
