Naphthalene is the abundant component of coal tar, the liquid residue formed during the distillation of coal into coke. Coke is distilled from coal to remove most of the impurities, leaving a carbonaceous solid which produces little or no smoke when burnt and is used as a smokeless fuel. Its boiling point is 217.97 °C, melting point is 78.2 °C and its flash point is 80 °C.

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Detailed Description for NAPHTHALENE




Naphthalene is a volatile, organic compound with the chemical formula C10H8. It is a polycyclic aromatic hydrocarbon with white crystalline solid that consists of an odor, which is noticeable at a chemical concentration that is as low as 0.08 ppm by mass. As a sweet-smelling hydrocarbon, this chemical structure is made of the fused pair of benzene rings. The Naphthalene is a key ingredient of traditional mothballs.




The naphthalene chemical is a resultant of coal tar. Since its inception and until the 1990s, the considerable amounts of this chemical were also produced through heavy petroleum fractions at the time of petroleum refining. However, in the recent times, the petroleum-derived naphthalene denotes only a minor component of naphthalene production.




Chemical formula


Molar mass

128.17 g·mol−1


White solid crystals/ flakes


Strong odor of coal tar


1.145 g/cm3 (15.5 °C)
1.0253 g/cm3 (20 °C)

Melting point

78.2 °C (172.8 °F; 351.3 K)
80.26 °C (176.47 °F; 353.41 K)
at 760 mmHg

Boiling point

217.97 °C (424.35 °F; 491.12 K)
at 760 mmHg

Solubility in water

19 mg/L (10 °C)


Soluble in alcohols, liquidammonia, carboxylic acids, C6H6, SO2CCl4CS2, toluene, aniline

Solubility in ethanol

5 g/100 g (0 °C)

Solubility in acetic acid

6.8 g/100 g (6.75 °C)
13.1 g/100 g (21.5 °C)
31.1 g/100 g (42.5 °C)
111 g/100 g (60 °C)[5]

Solubility in chloroform

19.5 g/100 g (0 °C)

Solubility in hexane

5.5 g/100 g (0 °C)

Solubility in butyric acid

13.6 g/100 g (6.75 °C)

log P


Vapor pressure

8.64 Pa (20 °C)

Henry's law
constant (kH)

0.42438 L·atm/mol

Thermal conductivity

98 kPa:
0.1219 W/m·K (372.22 K)

Refractive index(nD)



0.964 cP (80 °C)





Naphthalene is used primarily as a predecessor to other chemicals. Predominantly, this chemical is used in the industrial production of phthalic anhydride, although this chemical is made from the o-xylene. Naphtelene is a main ingredient of azo dyes. It is also used in the production of an insecticide-1-naphthyl-N-methylcarbamate. Besides, this chemical is used in production of other useful agrichemicals including naphthoxyacetic acids.

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Precautions when using Naphthalene Posted on 8/26/2016

• Keep away from open flames, heat, hot surfaces, sparks • Kept area should be No Smoking Zone • Use personal protective equipment when required • If it get into eyes than rinse cautiously with water for several minutes and also remove contact lenses if you wears and continue rinsing. Consult to eye doctor it recommended

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