Products Description of Petroleum Benzene CAS#71-43-2
Petroleum Benzene ,molecular formula C₆H₆, is a clear, volatile aromatic liquid obtained from naphtha reforming and steam cracking of crude oil. It has a distinctive sweet aromatic odour, slightly soluble in water while fully miscible with alcohols, ethers and other common organic solvents. As a mainstream petrochemical aromatic raw material, it features stable quality and low impurity content compared with coking benzene.
It is highly flammable and classified as toxic, so proper ventilation, flame control and personal protective measures must be enforced during storage, transport and handling.
Petroleum Benzene Chemical Properties
| Melting point | 5.53 °C (41.95 °F; 278.68 K) |
| Boiling point | 80.1 °C (176.2 °F; 353.2 K) |
| Density | 0.8765(20) g/cm3 |
| vapor density | 2.77 (vs air) |
| vapor pressure | 166 mm Hg ( 37.7 °C) |
| refractive index | 1.5011 (20 °C); 1.4948 (30 °C) |
| Flash point | −11.63 °C (11.07 °F; 261.52 K) |
| storage temp. | room temp |
| solubility | Miscible with alcohol, chloroform, dichloromethane, diethyl ether, acetone and acetic acid. |
| pka | 43(at 25℃) |
| form | liquid |
| color | Colorless |
| Relative polarity | 0.111 |
| Odor | Paint-thinner-like odor detectable at 12 ppm |
| explosive limit | 1.4-8.0%(V) |
| Odor Threshold | 2.7ppm |
| Water Solubility | 0.18 g/100 mL |
| Thermal Conductivity | 0.1412 W/(m·K) at 25 ℃ |
| Specific Heat Capacity | Cp(liquid): 1.74 J/(g·K); Cp(gas): 1.05 J/(g·K), at 25℃ |
| ex/em | λex 255 nm; λem 303 nm in cyclohexane |
| 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 | ACGIH TLV-TWA:0.02 ppm OSHA PEL-TWA:10 ppm (～32 mg/m3);PEL-Ceiling:25 ppm (～80 mg/m3);PEL-peak:50 ppm (～160 mg/m3)/10 min/8 h NIOSH REL-TWA:0.1 ppm;REL-STEL:1 ppm |
| Stability | Stable. Substances to be avoided include strong oxidizing agents, sulfuric acid, nitric acid, halogens. Highly flammable. |
| InChI | 1S/C6H6/c1-2-4-6-5-3-1/h1-6H |
| InChIKey | UHOVQNZJYSORNB-UHFFFAOYSA-N |
| SMILES | c1ccccc1 |
| EPA Primary Drinking Water Standard | MCL:0.005,MCLG:zero |
| LogP | 2.130 |
| Surface tension | 28.891mN/m at 293.15K |
| Toxicology and Carcinogenesis | Toxicology and Carcinogenesis Studies of Benzene (CASRN 71-43-2) in F344/N Rats and B6C3F1 Mice (Gavage Studies) |
| Substances Added to Food (formerly EAFUS) | BENZENE |
| REACH Annex XVII Substances List | Benzene (71-43-2) |
| FDA 21 CFR | 175.105 |
| CAS DataBase Reference | 71-43-2(CAS DataBase Reference) |
| EWG's Food Scores | 10 |
| NCI Dictionary of Cancer Terms | benzene |
| FDA UNII | J64922108F |
| Proposition 65 List | Benzene |
| NIST Chemistry Reference | Benzene(71-43-2) |
| IARC | 1 (Vol. 29, Sup 7. 100F, 120) 2018 |
| EPA Substance Registry System | Benzene (71-43-2) |
| Toxicological Profile|ATSDR | Benzene|Toxicological Profile|ATSDR |
| UNSPSC Code | 77101502 |
| NACRES | NA.24 |
Safety Information
| Signal word | Danger |
| Hazard statements | H302-H315-H319-H361-H372-H370-H340-H350-H336-H304-H401-H412-H225 |
| Precautionary statements | P501-P273-P270-P202-P240-P260-P210-P233-P201-P243-P241-P242-P271-P264-P280-P370+P378-P331-P337+P313-P305+P351+P338-P308+P311-P362+P364-P303+P361+P353-P332+P313-P301+P310-P304+P340+P312-P403+P233-P403+P235-P405 |
| target organs | Blood |
| 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 |
| OEB | E |
| OEL | TWA: 0.1 ppm, STEL: 1 ppm |
| WGK Germany | 3 |
| RTECS | CY1400000 |
| F | 3-10 |
| Autoignition Temperature | 560 °C |
| TSCA | TSCA listed |
| HS Code | 2902 20 00 |
| HazardClass | 3 |
| PackingGroup | II |
| Storage Class | 3 - Flammable liquids |
| Hazard Classifications | Aquatic Chronic 3 Asp. Tox. 1 Carc. 1A Eye Irrit. 2 Flam. Liq. 2 Muta. 1B Skin Irrit. 2 STOT RE 1 |
| Hazardous Substances Data | 71-43-2(Hazardous Substances Data) |
| Toxicity | LD50 orally in young adult rats: 3.8 ml/kg (Kimura) |
| IDLA | 500 ppm |
| REACH Registrations | Active |
| Limited Quantities | 1.0 L (0.3 gallon) (liquid) |
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml) |
Product Application of Petroleum Benzene CAS#71-43-2
Petroleum benzene serves as a cornerstone feedstock for the petrochemical aromatic chain. It is widely converted into ethylbenzene and styrene for polystyrene, SBR rubber and composite polymer materials. It can also be processed into cumene for phenol‑acetone production, cyclohexane for nylon‑6 raw materials, as well as nitrobenzene and aniline for polyurethane and dyestuff intermediates.
It is adopted to manufacture alkylbenzene for surfactant and detergent production. It can be used as an industrial solvent for grease and resin dissolving in limited approved scenarios.
