Benzonitrile Chemical Properties
- Melting point:
- -13 °C
- Boiling point:
- 191 °C(lit.)
- vapor density
- 3.6 (vs air)
- vapor pressure
- 1 hPa at 20 °C
- refractive index
- Flash point:
- 161 °F
- storage temp.
- Store below +30°C.
- Clear colorless to slightly yellow
- Relative polarity
- explosive limit
- Water Solubility
- 10 g/L (100 ºC)
- λ: 300 nm Amax: 1.0
λ: 310 nm Amax: 0.40
λ: 335 nm Amax: 0.03
λ: 360-400 nm Amax: 0.01
- Stable. Incompatible with strong bases, strong acids, strong oxidizing agents, strong reducing agents. Air-sensitive. Combustible.
- CAS DataBase Reference
- 100-47-0(CAS DataBase Reference)
- NIST Chemistry Reference
- EPA Substance Registry System
- Benzonitrile (100-47-0)
- Hazard Codes
- Risk Statements
- Safety Statements
- UN 2224 6.1/PG 2
- WGK Germany
- Autoignition Temperature
- 550 °C
- HS Code
- Hazardous Substances Data
- 100-47-0(Hazardous Substances Data)
- LDLo orl-rat: 720 mg/kg AMRL** TR-74-78,74
Benzonitrile Usage And Synthesis
Bezonitrile is a colorless, oily liquid. It has an almond odor.
When heated to decomposition, benzonitrile emits toxic hydrogen cyanide and oxides of nitrogen (HSDB 1988).
Benzonitrile is reported to be found in natural cocoa aroma), in milk products, roasted filberts and peanuts and cooked trassi . Benzonitrile also has been detected in the thermal decomposition products of flexible polyurethane foam.
Manufacture of benzoguanamine; intermediate for rubber chemicals; solvent for nitrile rubber, spe- cialty lacquers, and many resins and polymers, and for many anhydrous metallic salts.
Benzonitrile can be prepared by one of the following methods: 1) on a small scale by the dehydration in an inert solvent with phosphorus oxychloride or benzenesulfonyl chloride and an organic amine; 2) from benzoic acid by heating with lead thiocyanate; 3) by heating sodium benzenesulfonate with sodium cyanide or by adding benzenediazonium chloride solution to a hot aq sodium cyanide solution containing cupric sulfate and distilling by ammoxidation of toluene.
ChEBI: A nitrile that is hydrogen cyanide in which the hydrogen has been replaced by a phenyl group.
A clear colorless liquid with an almond-like odor. Flash point 161°F. Denser (at 8.4 lb / gal) than water and slightly soluble in water. Used as a specialty solvent and to make other chemicals.
Air & Water Reactions
Slightly soluble in water.
The cyano group can be readily hydrolyzed in the presence of mineral acids to produce stable, moderately toxic benzoic acid . When heated to decomposition, Benzonitrile emits highly toxic fumes of nitrogen oxides and hydrogen cyanide [Sax, 9th ed., 1996, p. 353].
High toxicity; absorbed by skin.
Benzonitrile may enter the human body by ingestion, absorption through the skin, or inhalation. The earliest symptoms of cyano compound intoxication may be weakness, headaches, confusion, and occasionally nausea and vomiting. The respiratory rate and depth will usually be increased at the beginning and at later stages become slow and gasping. Blood pressure is usually normal, especially in the mild or moderately severe cases, although the pulse rate is usually more rapid than normal.
Following an occupational accident in which a worker's head and clothing were
drenched with benzonitrile (Zeller et al 1969), the worker suffered severe respiratory
distress and tonic convulsions between periods of unconsciousness which
lasted for 75 min. Thereafter he gradually recovered, but several years later he
experienced episodes of unconsciousness which might have been related to the
Extensive reddening and blister formation resulted from accidental exposure of human skin to benzonitrile (Zeller et al 1969). A maximization test (Kligman 1966; Kligman and Epstein 1975) was also carried out on 35 volunteers. Benzonitrile was tested at a concentration of 2% in petrolatum on 27 volunteers in a mixed panel, and was found to produce no sensitization reactions after a 48 h closed-patch test (Opdyke 1979).
Special Hazards of Combustion Products: Toxic hydrogen cyanide and oxides of nitrogen may form in fire.
Reactivity with Water No reaction; Reactivity with Common Materials: Will attack some plastics; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.
Benzonitrile is used as an intermediate for rubber chemicals and as a solvent for nitrile rubber, specialty lacquers, many resins, polymers and for many anhydrous metallic salts (HSDB 1988; Hawley 1981). It is principally used as an intermediate for benzoguanamine (HSDB 1988). It is also used as an additive in nickel-plating baths, separating naphthalene and alkylnaphthalenes from non-aromatics by azetropic distillation; as jet-fuel additive; in cotton bleaching baths; as a drying additive for acrylic fibers; and in the removal of titanium tetrachloride and vanadium oxychloride from silicon tetrachloride (HSDB 1988; Smiley 1981). Benzonitrile is also used in perfumes at a maximum level of 0.2% in the final product (Opdyke 1979).
Poison by intraperitoneal andsubcutaneous routes. Moderately toxic by ingestion,inhalation, and skin contact. A skinirritant. Combustible liquid. When heated todecomposition it emits toxic fumes of CN- and NOx.
Bezonitrile is used as an electroplating agent; in organic synthesis of pharmaceuticals; dyestuffs; rubber chemicals; as a solvent and chemical intermediate.
Benzonitrile is mainly hydroxylated in vivo to cyanophenols, a small amount being hydrolysed to benzoic acid (Williams 1959). Benzonitrile also forms 6>-hydroxybenzonitrile, m-hydroxybenzonitrile, and /p-hydroxybenzonitrile in rabbits (HSDB 1988). In rabbit, 50% of a dose of 150 mg/kg was converted to conjugated cyanophenols and 10% of the benzonitrile fed was excreted as benzoic acid. Hydrogen cyanide is not a metabolite of benzonitrile (Williams 1959) and cyanide was not found to be formed by benzonitrile either in vivo or in vitro (Tanii and Hashimoto 1984). The in vivo microsomal hydroxylation of specifically deuterated benzonitrile in the rat yielded mainly 4-hydroxybenzonitrile with 41% retention of deuterium (Daly et al 1968).
UN2224 Benzonitrile, Hazard Class: 6.1; Labels: 6.1—Poisonous materials.
Dry benzonitrile with CaSO4, CaCl2, MgSO4 or K2CO3, and distil it from P2O5 in an all-glass apparatus, under reduced pressure (b 69o/10mm), collecting the middle fraction. Distillation from CaH2 causes some decomposition of benzonitrile. Isonitriles can be removed by preliminary treatment with conc HCl until the odour of isonitrile (carbylamine) has gone, followed by preliminary drying with K2CO3. (This treatment also removes amines.) Steam distil (to remove small quantities of carbylamine). The distillate is extracted into ether, washed with dilute Na2CO3, dried overnight with CaCl2, and the ether is removed by evaporation. The residue is distilled at 40mm (b 96o) [Kice et al. J Am Chem Soc 82 834 1960]. Conductivity grade benzonitrile (specific conductance 2 x 10-8 mho) is obtained by treatment with anhydrous AlCl3, followed by rapid distillation at 40-50o under vacuum. After washing with alkali and drying with CaCl2, the distillate is redistilled in a vacuum several times at 35o before fractionally crystallising several times by partial freezing. It is dried over finely divided activated alumina from which it is withdrawn when required [Van Dyke & Harrison J Am Chem Soc 73 402 1951]. [Beilstein 9 IV 892.]
May form explosive mixture with air. Strong acids which can release hydrogen cyanide. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Nitriles may polymerize in the presence of metals and some metal compounds. They are incompatible Benzonitrile 403 with acids; mixing nitriles with strong oxidizing acids can lead to extremely violent reactions. Nitriles are generally incompatible with other oxidizing agents such as peroxides and epoxides. The combination of bases and nitriles can produce hydrogen cyanide. Nitriles are hydrolyzed in both aqueous acid and base to give carboxylic acids (or salts of carboxylic acids). These reactions generate heat. Peroxides convert nitriles to amides. Nitriles can react vigorously with reducing agents. Acetonitrile and propionitrile are soluble in water, but nitriles higher than propionitrile have low aqueous solubility. They are also insoluble in aqueous acids.
(1) Mix with calcium hypochlorite and flush to sewer with water or (2) incinerate.
Benzonitrile Preparation Products And Raw materials
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