Products Description of o-Xylene CAS#95-47-6
o-Xylene, alternatively called ortho-xylene or 1,2-dimethylbenzene, has a molecular formula of C₈H₁₀. It is a transparent, colourless liquid aromatic hydrocarbon with a characteristic sweet aromatic smell. It shows negligible solubility in water, yet mixes completely with ethanol, ether and most other organic solvents.
This aromatic compound is obtained from naphtha reforming fractions by separation from mixed xylene isomers. It retains stable chemical properties at ordinary room conditions, and its fixed boiling point makes it fit for regulated oxidation reactions. As a highly flammable and volatile substance, it should be stored apart from heat sources, sparks and open fire. It is a vital petrochemical aromatic intermediate, particularly ideal for the production of phthalic anhydride.
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 | 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 primary industrial raw material for catalytic oxidation to yield phthalic anhydride. This derivative is then used to make phthalate plasticizers, alkyd resins and unsaturated polyester resins, which see broad application within PVC, coating and composite material sectors. It also works as an effective aromatic solvent for solvent-borne paints, varnishes, printing inks and adhesive formulations, capable of dissolving resins and tuning the viscosity of finished mixtures.
Furthermore, it is utilised in the synthesis of o-toluic acid, agrochemical intermediates and dyestuff precursors. It can function as a reference standard for chromatographic testing, and also serve as one component in high-octane fuel mixtures.
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