Products Description of maleic-anhydride.html">material/1-2-dimethylbenzene.html">1,2-Dimethylbenzene CAS# 95-47-6
Xylene is a colorless, flammable liquid. The melting points of ortho-, meta- and para-xylene are -25.2°C, -47.9°C and 13.3°C correspondingly, while their boiling points are 144.4°C, 139.1°C and 138.3°C. Relative densities are 0.8802, 0.8642 and 0.8611 respectively. It is insoluble in water but miscible with numerous organic solvents. Under catalytic oxidation, they produce phthalic anhydride, isophthalic acid and terephthalic acid sequentially.
Parameters
| Property | Value |
| 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 | n 20/D 1.505(lit.) |
| Fp | 90 °F |
| storage temp. | Store below +30°C. |
| solubility | water: partially soluble0.1705 g/L at 25°C |
| form | Solid or Crystalline Powder |
| pka | >15 (Christensen et al., 1975) |
| color | Yellow to beige |
| 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) |
| 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) |
| Exposure limits | NIOSH REL: 100 ppm (435 mg/m³ ), STEL 150 ppm (655 mg/m³ ), IDLH 900 ppm; OSHA PEL: TWA 100 ppm; ACGIH TLV: TWA 100 ppm, STEL 150 ppm (adopted). |
| Dielectric constant | 2.5699999999999998 |
| Stability: | Stable. Incompatible with oxidizing agents. Flammable. Hygroscopic. |
| InChIKey | CTQNGGLPUBDAKN-UHFFFAOYSA-N |
| 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) |
Safety Information
| Item | Details |
| 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 | Yes |
| HazardClass | 3 |
| PackingGroup | II |
| HS Code | 29024100 |
| Hazardous Substances Data | 95-47-6(Hazardous Substances Data) |
| Toxicity | Acute oral LD50 in rats is approximately 5 g/kg (quoted, RTECS, 1992). |
| IDLA | 900 ppm |
Product Application of 1,2-Dimethylbenzene CAS# 95-47-6
It is mainly applied as chemical raw materials and solvents. It can be utilized to manufacture phthalic anhydride, dyes, pesticides and pharmaceuticals including vitamins. It also serves as an additive for aviation gasoline.
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