Benzene
CAS Number:71-43-2
Chemical Formula:C6H6
Synonyms:
Benzene, OMniSolv(R)
Benzene, PestiSolv(R)
Benzene, for spectroscopy
Appearance: Transparent Liquid
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Benzene is a colorless, volatile, highly flammable liquid widely applied in the chemical industry and attracted great attention in the early development of organic chemistry. Thanks to its unique structure, benzene exhibits high stability and rarely undergoes addition reactions under normal conditions. Addition reactions of benzene usually demand high temperature, high pressure and special catalysts. The most frequent reactions of benzene are substitution reactions, in which one or more hydrogen atoms can be replaced by various atoms or atomic groups. Three major substitution reactions of benzene include alkylation, halogenation and nitration. During alkylation, one or more alkyl groups take the place of hydrogen atoms.
Parameters
| Property | Value |
| Melting point | 5.5 °C (lit.) |
| Boiling point | 80 °C (lit.) |
| density | 0.874 g/mL at 25 °C (lit.) |
| vapor density | 2.77 (vs air) |
| vapor pressure | 166 mm Hg ( 37.7 °C) |
| refractive index | n20/D 1.501(lit.) |
| Fp | 12 °F |
| storage temp. | room temp |
| solubility | Miscible with alcohol, chloroform, dichloromethane, diethyl ether, acetone and acetic acid. |
| pka | 43(at 25℃) |
| form | Liquid |
| color | APHA: ≤10 |
| Odor | Paint-thinner-like odor detectable at 12 ppm |
| Relative polarity | 0.111 |
| Odor Threshold | 2.7ppm |
| explosive limit | 1.4-8.0%(V) |
| Water Solubility | 0.18 g/100 mL |
| λmax | λ: 280 nm Amax: 1.0 λ: 290 nm Amax: 0.15 λ: 300 nm Amax: 0.06 λ: 330 nm Amax: 0.02 λ: 350-400 nm Amax: 0.01 |
| Merck | 14,1066 |
| BRN | 969212 |
| Henry’s Law Constant | 10.4 at 45.00 °C, 11.4 at 50.00 °C, 13.3 at 55.00 °C, 14.5 at 60.00 °C, 16.8 at 65.00 °C, 19.2 at 70.00 °C (static headspace-GC, Park et al., 2004) |
| Dielectric constant | 2.3（20℃） |
| Exposure limits | TLV-TWA 10 ppm (～32 mg/m3) (ACGIH and OSHA); ceiling 25 ppm (～80 mg/m3) (OSHA and MSHA); peak 50 ppm (～160 mg/m3)/10 min/8 h (OSHA); carcinogenicity: Suspected Human Carcinogen (ACGIH), Human Sufficient Evidence (IARC). |
| Stability: | Stable. Substances to be avoided include strong oxidizing agents, sulfuric acid, nitric acid, halogens. Highly flammable. |
| InChIKey | UHOVQNZJYSORNB-UHFFFAOYSA-N |
| LogP | 2.130 |
| Surface tension | 28.891mN/m at 293.15K |
| CAS DataBase Reference | 71-43-2(CAS DataBase Reference) |
| IARC | 1 (Vol. 29, Sup 7. 100F, 120) 2018 |
| NIST Chemistry Reference | Benzene(71-43-2) |
| EPA Substance Registry System | Benzene (71-43-2) |
Safety Information
| Item | Details |
| Hazard Codes | F,T |
| Risk Statements | 45-46-11-36/38-48/23/24/25-65-39/23/24/25-23/24/25 |
| Safety Statements | 53-45-36/37-16-7 |
| RIDADR | UN 1114 3/PG 2 |
| OEB | E |
| OEL | TWA: 0.1 ppm, STEL: 1 ppm |
| WGK Germany | 3 |
| RTECS | CY1400000 |
| F | 3-10 |
| Autoignition Temperature | 560 °C |
| TSCA | Yes |
| HS Code | 2902 20 00 |
| HazardClass | 3 |
| PackingGroup | II |
| Hazardous Substances Data | 71-43-2(Hazardous Substances Data) |
| Toxicity | LD50 orally in young adult rats: 3.8 ml/kg (Kimura) |
| IDLA | 500 ppm |
Product Application of Benzene CAS#71-43-2
Benzene exists in distillates of coal and coal tar, as well as petroleum products like gasoline. It can also be detected in gases and leachates from landfills containing industrial waste, construction debris and gardening refuse. Trace levels of benzene, toluene, xylene and other volatile organic compounds have been detected in soil and groundwater near many municipal landfills. Studies have evaluated benzene exposure during operations such as removal, cleaning, pumping and testing of underground gasoline storage tanks. Average human exposure ranged from 0.43 to 3.84 ppm within 1.5 to 6 hours, and the maximum short‑term (15‑minute) exposure reached 9.14 ppm. Benzene is also present in tobacco smoke, which may increase the risk of inhalation exposure.
Benzene serves as a solvent for waxes, resins and oils; a paint remover; a thinner for lacquers; a raw material in manufacturing dyes, pharmaceuticals, varnishes and linoleum; and a fundamental feedstock for producing many organic compounds.
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