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EINECS 202-849-4
CAS No. 100-41-4 Density 0.865 g/cm3
Solubility 0.0206 g/100 mL in water Melting Point -95 °C(lit.)
Formula C8H10 Boiling Point 136.248 °C at 760 mmHg
Molecular Weight 106.18 Flash Point 25.941 °C
Transport Information UN 1175 3/PG 2 Appearance colourless liquid
Safety 9-16-29-33-24/25-36/37-36-45-36/37/39-26-23-53-7-24 Risk Codes 12-19-22-66-67-20-11-48/20/22-40-38-36/37/38-23/24/25-46-45-39/23/24/25-23/25
Molecular Structure Molecular Structure of 100-41-4 (Ethylbenzene) Hazard Symbols HighlyF+,HarmfulXn,IrritantXi,FlammableF,ToxicT

EB;Ethylbenzol;NSC 406903;Phenylethane;a-Methyltoluene;


Ethylbenzene Consensus Reports

Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program. Community Right-To-Know List.

Ethylbenzene Standards and Recommendations

OSHA PEL: TWA 100 ppm; STEL 125 ppm
ACGIH TLV: TWA 100 ppm; STEL 125 ppm; Confirmed Animal Carcinogen with Unknown Revelance to Humans; BEI: 1.5 g/g creatinine of manelic acid) in urine at end of shift at end of workweek
DFG MAK: 100 ppm (440 mg/m3)
NIOSH REL: (Ethyl Benzene) TWA 100 ppm; STEL 125 ppm
DOT Classification:  3; Label: Flammable Liquid

Ethylbenzene Analytical Methods

For occupational chemical analysis use NIOSH: Hydrocarbons, Aromatic, 1501.

Ethylbenzene Specification

The IUPAC name of this chemical is Ethylbenzene. With the CAS registry number 100-41-4, it is also named as Aethylbenzol. The product's categories are Pharmaceutical Intermediates; Organics; Analytical Chemistry; Standard Solution of Volatile Organic Compounds for Water & Soil Analysis; Standard Solutions (VOC); Amber Glass Bottles; ReagentPlus(R) Solvent Grade Products; Solvent Bottles; E-FAlphabetic. It is colourless liquid with an aromatic odor, which can react vigorously with strong oxidizing materials. It is toxic and flammable by fire, heat and oxidants. So the storage environment should be ventilate, low-temperature and dry. Keep Ethyl benzene separate from oxidant and acid. 

The other characteristics of this product can be summarized as: (1)ACD/LogP: 3.23; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.229; (4)ACD/LogD (pH 7.4): 3.229; (5)ACD/BCF (pH 5.5): 167.574; (6)ACD/BCF (pH 7.4): 167.574; (7)ACD/KOC (pH 5.5): 1360.491; (8)ACD/KOC (pH 7.4): 1360.491; (9)#H bond acceptors: 0; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 1 ; (12)Index of Refraction: 1.497; (13)Molar Refractivity: 35.802 cm3; (14)Molar Volume: 122.251 cm3; (15)Polarizability: 14.193×10-24 cm3; (16)Surface Tension: 29.072 dyne/cm; (17)Enthalpy of Vaporization: 35.57 kJ/mol; (18)Vapour Pressure: 9.213 mmHg at 25°C; (19)Rotatable Bond Count: 1; (20)Exact Mass: 106.07825; (21)MonoIsotopic Mass: 106.07825; (22)Heavy Atom Count: 8; (23)Complexity: 51.1.

Preparation of Ethyl benzene: It is manufactured from benzene and ethylene by several modifications of the older mixed liquid-gas reaction system using aluminum chloride as a catalyst (Friedel-Crafts reaction). The reaction takes place in the gas phase over a fixed-bed unit at 370 °C under apressure of 1450 to 2850 kPa. Unchanged and polyethylated materials are recirculated, making a yield of 98 percent possible. The catalyst dperates several days before requiring regeneration.
 C6H6 + CH2=CH2 (+AlCl3/HCl or zeolite) → C6H5CH2CH3(+AlCl3/HCl or zeolite)
Excess benzene is used if the formation of di- and trimEthylbenzenes is to be avoided or minimized. The benzene is recycled. In the more modem process the reaction takes place in the liquid phase, using a zeolite catalyst and cycle lengths in excess of 3 years are expected for the catalyst.

Uses of Ethyl benzene: It is important in the petrochemical industry as an intermediate in the production of styrene, which in turn is used for making polystyrene, a commonly used plastic material. It is also used as a solvent for aluminum bromide in the anhydrous electrodeposition of aluminum. In addition, it is used as intermediate syntomycin and chloramphenicol. Besides, it can react with tert-butyl hydroperoxide to get 1-phenylethyl tert-butyl peroxide and 1-phenyl-ethanone. This reaction needs catalyzer vanadium-substituted V-MCM-41 (A) zeolite and solvent acetone at temperature of 60 °C. The reaction time is 8 hours. 

When you are using this chemical, please be cautious about it as the following:
It is extremely flammable, so people should keep it away from sources of ignition. And it may form explosive peroxides. In addition, this chemical is not only harmful if swallowed, but also toxic by inhalation, in contact with skin and if swallowed. So people should avoid contact with skin and eyes. Besides, it may cause cancer and may cause heritable genetic damage. If you want to contact this product, you must wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 

People can use the following data to convert to the molecule structure.
1. SMILES:CCc1ccccc1
2. InChI:InChI=1/C8H10/c1-2-8-6-4-3-5-7-8/h3-7H,2H2,1H3

The following are the toxicity data which has been tested.

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
guinea pig LCLo inhalation 10000ppm (10000ppm) SENSE ORGANS AND SPECIAL SENSES: OTHER CHANGES: OLFACTION


Public Health Reports. Vol. 45, Pg. 1241, 1930.
human TCLo inhalation 100ppm/8H (100ppm) SENSE ORGANS AND SPECIAL SENSES: OTHER: EYE


American Industrial Hygiene Association Journal. Vol. 31, Pg. 206, 1970.
mouse LCLo inhalation 50gm/m3/2H (50000mg/m3)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 5(5), Pg. 3, 1961.
mouse LD50 intraperitoneal 2624uL/kg (2.624mL/kg)   Archives of Toxicology. Vol. 58, Pg. 106, 1985.
rabbit LD50 skin 17800uL/kg (17.8mL/kg)   Food and Cosmetics Toxicology. Vol. 13, Pg. 803, 1975.
rat LCLo inhalation 4000ppm/4H (4000ppm)   American Industrial Hygiene Association Journal. Vol. 23, Pg. 95, 1962.
rat LD50 oral 3500mg/kg (3500mg/kg) LIVER: OTHER CHANGES

AMA Archives of Industrial Health. Vol. 14, Pg. 387, 1956.

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