1,2-Dimethylbenzene CAS# 95-47-6
Products Description of 1,2-Dimethylbenzene CAS# 95-47-6
Xylene is a colorless, flammable liquid with distinct physicochemical properties among its three isomers (o-xylene, m-xylene, and p-xylene).
Physicochemical Properties of Isomers。Melting points: -25.2°C (o-xylene), -47.9°C (m-xylene), and 13.3°C (p-xylene).Boiling points: 144.4°C (o-xylene), 139.1°C (m-xylene), and 138.3°C (p-xylene).Relative densities (per Chemicalbook data): 0.8802 (o-xylene), 0.8642 (m-xylene), and 0.8611 (p-xylene).Solubility: Insoluble in water but miscible with a wide range of organic solvents.
Chemical Reactivity
Upon catalytic oxidation, o-xylene, m-xylene, and p-xylene yield phthalic anhydride, isophthalic acid, and terephthalic acid respectively.
Parameters
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 | 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 |
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
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
Functions as a core chemical raw material and solvent, enabling the synthesis of phthalic anhydride, dyes, pesticides, and pharmaceutical products (e.g., vitamins), and can also be incorporated as an additive in aviation gasoline.
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