Nitrobenzene Chemical Properties
- Melting point:
- 5-6 °C(lit.)
- Boiling point:
- 210-211 °C(lit.)
- vapor density
- 4.2 (vs air)
- vapor pressure
- 0.15 mm Hg ( 20 °C)
- refractive index
- Flash point:
- 190 °F
- storage temp.
- 3.98(at 0℃)
- Clear yellow
- 8.1 (1g/l, H2O, 20℃)
- Relative polarity
- explosive limit
- Water Solubility
- slightly soluble
- Henry's Law Constant
- 9.86 at 25 °C (thermodynamic method-GC/UV spectrophotometry, Altschuh et al., 1999)
- Exposure limits
- TLV-TWA 1 ppm (～5 mg/m3) (ACGIH, MSHA, and OSHA); IDLH 200 ppm (NIOSH).
- Stable. Incompatible with strong oxidizing agents, strong reducing agents, strong bases. Flammable. Note wide explosion limits.
- CAS DataBase Reference
- 98-95-3(CAS DataBase Reference)
- 2B (Vol. 65) 1996
- NIST Chemistry Reference
- Benzene, nitro-(98-95-3)
- EPA Substance Registry System
- Nitrobenzene (98-95-3)
- Hazard Codes
- Risk Statements
- Safety Statements
- UN 1662 6.1/PG 2
- WGK Germany
- Autoignition Temperature
- 899 °F
- HS Code
- Hazardous Substances Data
- 98-95-3(Hazardous Substances Data)
- LD50 orally in rats: 600 mg/kg (PB91-108398)
Nitrobenzene Usage And Synthesis
Nitrobenzene (chemical formula: C6H4NO2) is a yellowish, oily, aromatic nitro-compound. The most important application of nitrobenzene (consuming 95%) is for the manufacturing of aniline, which is an important industrial precursor. Besides aniline, it can also be used to generate related derivatives such as azobenzene, nitrosobenzene and phenylhydroxylamine. Moreover, it can be used for the production of lubricating oils, dyes, drugs, pesticides, and synthetic rubber. Another special application of it is masking unpleasant odors emitting from shoe, floor polisher, and leather as well as paint solvents. In addition, it can sometime used as a solvent, especially for electrophilic reagents in the laboratory. The nitrobenzene is mainly manufactured through the nitration of benzene with the mixture of concentrated sulfuric acid, water and nitric acid. However, the reaction process is quite dangerous due to the exothermicity of the reaction.
Nitrobenzene has a single nitro group attached to a benzene ring. It is an oily yellow liquid with an almond-like odor.It is moderately soluble in water (1.9 g/l at 20 °C) and is soluble in alcohol, acetone, ether, and benzene (IARC, 1996). It has an explosive limit of 1.8% by volume in air, representing a fire hazard.
Nitrobenzene is a synthetic, volatile compound produced primarily for use to manufacture aniline. It is also used as a solvent in refining petroleum and lubricating oils, and in production of dyes, synthetic rubber, pesticides, and drugs including acetaminophen and metoclopramide. Small amounts of nitrobenzene are used as a flavoring agent for soaps and as a solvent for shoe dyes (HSDB, 2009; IARC, 1996). Dinitrobenzene isomers (1, 2-, 1, 3-, and 1, 4-) are used in organic synthesis of dyes, pesticides, and industrial solvents. 1,3-Dinitrobenzene and 1,3,5-trinitrobenzene are chemicals found in the production of explosives.
Nitrobenzene and all isomers (1,2-, 1,3-, and 1,4-) of dinitrobenzene can be absorbed by all routes of exposures and may cause irritation in the respiratory tract and skin. 1,3- Dinitrobenzene and 1,3,5-trinitrobenzene are of severe explosive hazard.
Aromatic nitro compounds mixed with nitrobenzene are explosives of high sensitivity and detonation velocities and are spark detonatable).
Nitrobenzene is a pale yellow to dark brown oily liquid whose odor resembles bitter almonds (or black paste shoe polish).
Clear, light yellow to brown, oily liquid with an almond-like or shoe polish odor. May darken on exposure to air. An experimentally determined odor threshold concentration of 4.7 ppbv was reported by Leonardos et al. (1969). A detection odor threshold concentration of 9.6 mg/m3 (1.9 ppmv) was determined by Katz and Talbert (1930).
Most nitrobenzene (97%) is used in the manufacture of aniline (IARC 1996, HSDB 2009). Miscellaneous uses include the manufacture of benzidine, quinoline, azobenzene, pyroxylin compounds, isocyanates, pesticides, rubber chemicals, pharmaceuticals, and dyes such as nigrosines and magenta. Nitrobenzene is found in soaps and shoe and metal polishes and is used as a solvent for cellulose ester, in modifying esterification of cellulose acetate, and in refining lubricating oils (HSDB 2009). Nitrobenzene also is used as a solvent in petroleum refining and the synthesis of other organic compounds, such as acetaminophen (ATSDR 1990).
The primary use of nitrobenzene is in the captive production of aniline, with about 97.5% of nitrobenzene production consumed in this process. The major use of aniline is in the manufacture of polyurethanes. Nitrobenzene is also used as a solvent in petroleum refining, in the manufacture of cellulose ethers and acetate, and in Friedel-Crafts reactions to hold the catalyst in solution. It is also used in the synthesis of other organic compounds including acetaminophen, which is an over-the-counter analgesic commonly known as Tylenol?.
Nitrobenzene is used as a flavoring agent, a perfume for soaps and as a solvent for shoe dyes.
Nitrobenzene is an organic compound used a standard for detection and analyses as well as its removal from the environment. The compound’s cytotoxic effects have been studied in a hepatocarcinoma cell line.
For the manufacture of aniline; in soaps, shoe polishes; for refining lubricating oils; manufacture of pyroxylin Compounds.
Nitrobenzene is produced by the direct nitration of benzene with a mixture of sulfuric and nitric acids. U.S. capacity for nitrobenzene production is approximately 1.5 billion pounds . The most important use for nitrobenzene is in the production of aniline. Nearly 98% of the nitrobenzene produced in the U.S. is converted to aniline.
ChEBI: A nitroarene consisting of benzene carrying a single nitro substituent. An industrial chemical used widely in the production of aniline.
Nitrobenzene is produced commercially by the exothermic nitration of benzene with fuming nitric acid in the presence of a sulfuric acid catalyst at 50 to 65℃. The crude nitrobenzene is passed through washer-separators to remove residual acid and is then distilled to remove benzene and water.
A yellow organic oil obtained by refluxing benzene with a mixture of concentrated nitric and sulfuric acids. The reaction is a typical electrophilic substitution on the benzene ring by the nitryl cation (NO2+).
nitrobenzene: A yellow oily liquid,C6H5NO2; r.d. 1.2; m.p. 6°C; b.p.211°C. It is made by the nitration ofbenzene using a mixture of nitricand sulphuric acids.
Air & Water Reactions
Very slightly soluble in water.
Aluminum chloride added to Nitrobenzene containing about 5% phenol caused a violent explosion [Chem. Eng. News 31:4915. 1953]. Heating a mixture of Nitrobenzene, flake sodium hydroxide and a little water led to an explosion, discussed in [Bretherick's 5th ed. 1995]. Mixed with oxidants, i.e. dinitrogen tetraoxide, fluorodinitromethane, nitric acid, peroxodisulfuric acid, sodium chlorate, tetranitromethane, uranium perchlorate, etc., forms highly sensitive explosive, [Bretherick 5th ed, 1995]. Heated mixtures of Nitrobenzene and tin(IV) chloride produce exothermic decomposition with gas production [Bretherick, 5th Ed., 1995].
Toxic by ingestion, inhalation, and skin absorption. Methemoglobinemia. Possible carcinogen.
The routes of entry of nitrobenzene intothe body are the inhalation of its vaporsor absorption of the liquid or the vaporthrough the skin and, to a much lesserextent, ingestion. The target organs are theblood, liver, kidneys, and cardiovascular system. Piotrowski (1967) estimated that in anexposure period of 6 hours to a concentration of 5 mg/m3, 18 mg of nitrobenzene wasabsorbed through the lungs and 7 mg throughthe skin in humans. Furthermore, about 80%of inhaled vapor is retained in the respiratorytract. The dermal absorption rate at this concentration level is reported as 1 mg/h, whilethe subcutaneous absorption of the liquidis between 0.2 and 0.3 mg/cm3/h (ACGIH1986).
The symptoms of acute toxicity are headache, dizziness, nausea, vomiting, and dyspnea. Subacute and chronic exposure cancause anemia. Nitrobenzene effects the conversion of hemoglobin to methemoglobin. Itis metabolized to aminophenols and nitrophenols to about 30%, which are excreted.
Moderate explosion hazard when exposed to heat or flame. Reacts violently with nitric acid, aluminum trichloride plus phenol, aniline plus glycerine, silver perchlorate and nitrogen tetroxide. Avoid aluminum trichloride; aniline; gycerol; sulfuric acid; oxidants; phosphorus pentachloride; potassium; potassium hydroxide. Avoid sunlight, physical damage to container, freezing, and intense heat.
Nitrobenzene is mainly utilized for aniline production. The aniline is used primarily for the manufacture of 4,4'-methylenebis (phenyl isocyanate) and polymers thereof (50%). The second largest use of aniline is in the manufacture of chemicals for rubber production (30%). Dyes and dye intermediates, hydroquinone and drugs account for about 8% of the aniline produced, while 10% of the aniline is converted to agricultural products such as pesticides and defoliants (Northcott 1978). It also is used as a solvent for cellulose ethers and an ingredient in polishes for metals and shoes (HSDB 1988).
Confirmed carcinogen. Human poison by an unspecified route. Poison experimentally by subcutaneous and intravenous routes. Moderately toxic by ingestion, skin contact, and intraperitoneal routes. Human systemic effects by ingestion: general anesthetic, respiratory stimulation, and vascular changes. An experimental teratogen. Experimental reproductive effects. Mutation data reported. An eye and skin irritant. Can cause cyanosis due to formation of methemoglobin. It is absorbed rapidly through the skin. The vapors are hazardous. to heat and flame. Moderate explosion hazard when exposed to heat or flame. Explosive reaction with solid or concentrated alkali + heat (e.g., sodium hydroxide or potassium hydroxide), aluminum chloride + phenol (at 12O°C), aniline + glycerol + sulfuric acid, nitric + sulfuric acid + heat. Forms explosive mixtures with aluminum chloride, oxidants (e.g., fluorodinitromethane, uranium perchlorate, tetranitromethane, sodium chlorate, nitric acid, nitric acid + water, peroxodsulfuric acid, dinitrogen tetraoxide), phosphorus pentachloride, potassium, sulfuric acid. Reacts violently with aniline + glycerin, N20, AgCLO4. To fight fne, use water, foam, CO2, dry chemical. Incompatible with potassium hydroxide. When heated to decomposition it emits toxic fumes of NOx. See also NITRO COMPOUNDS OF AROMATIC HYDROCARBONS.
Nitrobenzene is used in the manufacture of explosives and aniline dyes and as solvent and intermediate. It is also used in floor polishes; leather dressings and polished; and paint solvents, and to mask other unpleasant odors. Substitution reactions with nitrobenzene are used to form m-derivatives. Pregnant women may be especially at risk with respect to nitrobenzene as with many other chemical compounds, due to transplacental passage of the agent. Individuals with glucose-6-phosphate dehydrogenase deficiency may also be special risk groups. Additionally, because alcohol ingestion or chronic alcoholism can lower the lethal or toxic dose of nitrobenzene, individuals consuming alcoholic beverages may be at risk.
Nitrobenzene is reasonably anticipated to be a human carcinogenbased on sufficient evidence of carcinogenicity from studies in experimental animals.
Biological. In activated sludge, 0.4% of the applied nitrobenzene mineralized to carbon dioxide
after 5 d (Freitag et al., 1985). Under anaerobic conditions using a sewage inoculum, nitrobenzene
degraded to aniline (Hallas and Alexander, 1983). When nitrobenzene (5 and 10 mg/L) was
statically incubated in the dark at 25 °C with yeast extract and settled domestic wastewater
inoculum, complete biodegradation with rapid acclimation was observed after 7 to 14 d (Tabak et
al., 1981). In activated sludge inoculum, 98.0% COD removal was achieved in 5 d. The average
rate of biodegradation was 14.0 mg COD/g?h (Pitter, 1976).
Razo-Flores et al. (1999) studied the fate of nitrobenzene (50 mg/L) in an upward-flow anaerobic sludge bed reactor containing a mixture of volatile fatty acids and/or glucose as electron donors. The nitrobenzene loading rate and hydraulic retention time for this experiment were 43 mg/L?d and 28 h, respectively. Nitrobenzene was effectively reduced (>99.9%) to aniline (92% molar yield) in stoichiometric amounts for the 100-d experiment.
Photolytic. Irradiation of nitrobenzene in the vapor phase produced nitrosobenzene and 4- nitrophenol (HSDB, 1989). Titanium dioxide suspended in an aqueous solution and irradiated with UV light (λ = 365 nm) converted nitrobenzene to carbon dioxide at a significant rate (Matthews, 1986). A carbon dioxide yield of 6.7% was achieved when nitrobenzene adsorbed on silica gel was irradiated with light (λ >290 nm) for 17 h (Freitag et al., 1985).
Chemical/Physical. In an aqueous solution, nitrobenzene (100 μM) reacted with Fenton’s reagent (35 μM). After 15 min, 2-, 3-, and 4-nitrophenol were identified as products. After 6 h, about 50% of the nitrobenzene was destroyed. The pH of the solution decreased due to the formation of nitric acid (Lipczynska-Kochany, 1991). Augusti et al. (1998) conducted kinetic studies for the reaction of nitrobenzene (0.2 mM) and other monocyclic aromatics with Fenton’s reagent (8 mM hydrogen peroxide; [Fe+2] = 0.1 mM) at 25 °C. They reported a reaction rate constant of 0.0260/min.
Nitrobenzene vapor is readily absorbed through the skin and lungs. At an airborne
nitrobenzene concentration of 10 mg/m3 humans may absorb 18 to 25 mg in 6 h
through the lungs and from 8 to 19 mg
through the skin in the same length of time
Urine is the major route of excretion of nitrobenzene metabolites in rabbits , rats and mice . The most abundant metabolite in earlier studies in rabbits and rats was p-aminophenol. This compound, or its glucuronide or sulfate conjugates, accounted for 19% to 31% of the dose. In a later study in rats in which the acid hydrolysis step employed by earlier workers to cleave conjugates was replaced by enzyme hydrolysis, no p-aminophenol was found in the urine of male Fischer-344 or CD rats .
About 9% of a nitrobenzene dose was excreted by B6C3F1 mice as the sulfate conjugate. The major metabolites found in Fischer-344 rat urine were p-hydroxyacetanilide sulfate (19% of the dose), p-nitrophenol sulfate (20% of the dose) and m-nitrophenol sulfate (10% of the dose) .
In addition, an unidentified metabolite accounted for about 10% of the dose .
Male CD rats excreted the same metabolites after an oral dose of nitrobenzene, but in slightly different proportions. They excreted about half as much of the dose as the glucuronide or sulfate conjugates of P-hydroxyacetanilide (9% of the dose) and P-nitrophenol (13% of the dose), approximately the same amount of m-nitrophenol (8% of the dose), and about twice as much as the unidentified metabolite. Interestingly, whereas Fischer-344 rats excreted the phenolic metabolites of nitrobenzene exclusively as sulfates, CD rats excreted the same metabolites in the free form (15-17% of the total metabolite) and as glucuronides (4-20% of the total metabolite).
Approximately 4% of the dose also was excreted as p-hydroxyacetanilide by B6C3F1 mice and as p- and m-nitrophenol (7% and 6% of the dose, respectively) sulfates, glucuronides and free metabolites .
Clearly, ring hydroxylation and reduction are important metabolic steps in the biotransformation of nitrobenzene in rabbits, rats, mice and humans . Since no significant isotope effect was found in the metabolism of deuterated nitrobenzene to these products in rats in vivo , the o- and p-nitrophenols may be formed through an arene oxide intermediate. A significant isotope effect was noted in the formation of m-nitrophenol from deuterated nitrobenzene in the same rats, leading to the conclusion that m-nitrophenol is formed by a direct oxygen insertion mechanism or by some other mechanism which does not involve an arene oxide intermediate. The reduction of nitrobenzene in vivo is largely, if not exclusively, due to the action of anaerobic intestinal microflora. Treatment with antibiotics totally eliminated the ability of cecal contents of Fischer-344 rats to reduce nitrobenzene in vitro, and rats treated with antibiotics eliminated p-hydroxyacetanilide as 0.9% of an oral dose of nitro-benzene. Normal rats excreted 16.2% of an oral dose of nitrobenzene as that metabolite .
The reduction of most nitro compounds by hepatic microsomes is not detectable under aerobic conditions, but is readily observable under anaerobic conditions. Mason and Holtzman proposed that the first intermediate in the microsomal reduction of nitroaromatic compounds is the nitro anion radical, the product of a one electron transfer to nitrobenzene or other nitroaromatic compound. Oxygen would rapidly oxidize the radical to yield the parent nitro compound and Superoxide anion. Both the nitro anion radical and Superoxide anion are potentially toxic compounds.
Both P-nitrophenol and P-aminophenol have been detected in human urine after exposure to nitrobenzene. p-Aminophenol has been found only after large accidental exposures and acid hydrolysis of urine. Since acid conditions convert p-acetamidophenol to P-aminophenol, the identity of the metabolite actually excreted is in doubt. P-Nitrophenol has been found in the urine of volunteers exposed to low inhalation doses of nitrobenzene, and Kuzelova and Popler have suggested that urinary P-nitrophenol be used to monitor exposure to nitrobenzene.
UN1662 Nitrobenzene, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.
Common impurities include nitrotoluene, dinitrothiophene, dinitrobenzene and aniline. Most impurities can be removed by steam distillation in the presence of dilute H2SO4, followed by drying with CaCl2, and shaking with, then distilling at low pressure from BaO, P2O5, AlCl3 or activated alumina. It can also be purified by fractional crystallisation from absolute EtOH (by refrigeration). Another purification process includes extraction with aqueous 2M NaOH, then water, dilute HCl, and water, followed by drying (CaCl2, MgSO4 or CaSO4) and fractional distillation under reduced pressure. The pure material is stored in a brown bottle, in contact with silica gel or CaH2. It is very hygroscopic. [Beilstein 5 H 233, 5 I 124, 5 II 171, 5 III 591, 5 IV 708.]
Concentrated nitric acid, nitrogen tetroxide; caustics; phosphorus pentachloride; chemically-active metals, such as tin or zinc. Violent reaction with strong oxidizers and reducing agents. Attacks many plastics. Forms thermally unstable compounds with many organic and inorganic compounds.
Incineration (982℃, 2.0 seconds minimum) with scrubbing for nitrogen oxides abatement . Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal.
Nitrobenzene Preparation Products And Raw materials
- 2-FLUORO-7-NITROFLUORENE, 99