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Benzene CAS#71-43-2
CAS Number:71-43-2
Chemical Formula:C6H6
Synonyms:
Benzene, OMniSolv(R)
Benzene, PestiSolv(R)
Benzene, for spectroscopy
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Appearance: Transperant Liquid
Benzene CAS#71-43-2
Benzene is a colorless, volatile, highly flammable liquid that is used extensively in the chemical industry and received wide interest in the early days of organic chemistry.Because of its structure, benzene is a very stable organic compound. It does not readily undergo addition reactions. Addition reactions involving benzene require high temperature, pressure, and special catalysts. The most common reactions involving benzene involve substitution reactions. Numerous atoms and groups of atoms may replace a hydrogen atom or several hydrogen atoms in benzene. Th ree important types of substitution reactions involving benzene are alkylation, halogenation, and nitration. In alkylation, an alkyl group or groups substitute for hydrogen(s).
| Benzene Chemical Properties |
| 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 | n |
| 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 |
| 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 occurs in coal and coal-tar distillationproducts and in petroleum products suchas gasoline. It is also found in the gases andleachates of landfills for industrial wastes,construction debris, and landscaping refuse(Oak Ridge National Laboratory 1989). Traceamounts of benzene, toluene, xylenes, andother volatile organics have been found inthe soils and groundwaters near many sanitarylandfills (U.S. EPA 1989a,b). Kramer(1989) has assessed the level of exposuresto benzene during removal, cleaning, pumping,and testing of underground gasoline storagetanks. The average human exposureswere 0.43–3.84 ppm (in 1.5–6 hours) and thehighest short-term (15–minute) exposure was9.14 ppm. Benzene also occurs in the tobaccosmoke (Hoffmann et al. 1989); thus the riskof its exposure may enhance from inhalingsuch smoke.
Benzene is used as a solvent for waxes,resins, and oils; as a paint remover; as a diluentfor lacquers; in the manufacture of dyes,pharmaceuticals, varnishes, and linoleum;and as a raw material to produce a numberof organic compounds.
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