1,2-Dimethylbenzene CAS# 95-47-6
1. Versatile Solubility: Xylene is insoluble in water but highly miscible with a range of organic solvents, making it ideal for various industrial applications.
2. Catalytic Oxidation: When catalytically oxidized, Xylene can produce valuable chemicals such as phthalic anhydride, isophthalic acid, and terephthalic acid, crucial for the production of plastics and resins.
3. Stable & Safe Handling: Xylene is stable under normal conditions, although it is flammable and hygroscopic. It has established exposure limits, ensuring safe handling and usage in industries.
4. Low Boiling Point & High Efficiency: With a boiling point of 143-145°C, Xylene is effective in high-temperature applications, and its volatility aids in efficient processes like solvent extraction and distillation.
Xylene is a colorless, flammable liquid. The melting points of o-, m-, and p-xylene are -25.2°C, -47.9°C, and 13.3°C, respectively, while their boiling points are 144.4°C, 139.1°C, and 138.3°C. The relative densities listed in Chemicalbook are 0.8802, 0.8642, and 0.8611, respectively. Xylene is insoluble in water but readily miscible with various organic solvents. When subjected to catalytic oxidation, it produces phthalic anhydride, isophthalic acid, and terephthalic acid in sequence.
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 |
