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Naphthalene

Naphthalene, the simplest of the fused or condensed ring hydrocarbon compounds composed of two benzene rings sharing two adjacent carbon atoms. Naphthalene is the most abundant single constituent of coal tar, a volatile product from the destructive distillation of coal, and is also formed in modern processes for the high-temperature cracking (breaking up of large molecules) of petroleum. Naphthalene is an important hydrocarbon raw material and is primarily used to manufacture phthalic anhydride and polyvinyl chloride (PVC) plastics, but is also used in moth repellents and toilet deodorant blocks.
Naphthalene Suppliers list
Company Name:Shanghai Macklin Biochemical Co.,Ltd.  Gold
Tel:15221275939
Email:shenlinxing@macklin.cn
Products Intro: Product Name:Naphthalene solution
CAS:91-20-3
Purity:Standard for GC,>=99.5%(GC) Package:2ml
Company Name:Hangzhou QiFei Chemical Co., Ltd.  Gold
Tel:0571-28950939 18058801870 13661490451
Email:hzqifeihuagong@163.com
Products Intro: CAS:91-20-3
Purity:99%
Company Name:J & K SCIENTIFIC LTD.  
Tel:400-666-7788 +86-10-82848833
Email:jkinfo@jkchemical.com;market6@jkchemical.com
Products Intro: Product Name:Naphthalene
CAS:91-20-3
Purity:99% Package:1KG,250G
Company Name:Meryer (Shanghai) Chemical Technology Co., Ltd.  
Tel:+86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-59487313(Beijing)
Email:sh@meryer.com
Products Intro: Product Name:Naphthalene
CAS:91-20-3
Purity:99% Package:250g;1kg Remarks:AAA125343
Company Name:3B Pharmachem (Wuhan) International Co.,Ltd.  
Tel:86-21-50328103 * 801、802、803、804 Mobile:18930552037
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Products Intro: Product Name:Naphthalene
CAS:91-20-3
Purity:99% HPLC Package:1Mg ; 5Mg;10Mg ;100Mg;250Mg ;500Mg ;1g;2.5g ;5g ;10g
Naphthalene Chemical Properties
Melting point 80-82 °C(lit.)
Boiling point 218 °C(lit.)
density 0.99
vapor density 4.4 (vs air)
vapor pressure 0.03 mm Hg ( 25 °C)
refractive index 1.5821
Fp 174 °F
storage temp. APPROX 4°C
Water Solubility 30 mg/L (25 ºC)
Merck 14,6370
BRN 1421310
CAS DataBase Reference91-20-3(CAS DataBase Reference)
NIST Chemistry ReferenceNaphthalene(91-20-3)
EPA Substance Registry SystemNaphthalene(91-20-3)
Safety Information
Hazard Codes Xn,N,F,T
Risk Statements 22-40-50/53-67-65-38-11-39/23/24/25-23/24/25-52/53-20
Safety Statements 36/37-46-60-61-62-45-16-7-33-25-9
RIDADR UN 1334 4.1/PG 3
WGK Germany 3
RTECS QJ0525000
TSCA Yes
HazardClass 4.1
PackingGroup III
HS Code 29029010
Hazardous Substances Data91-20-3(Hazardous Substances Data)
MSDS Information
ProviderLanguage
Naphthalene English
ACROS English
SigmaAldrich English
ALFA English
Naphthalene Usage And Synthesis
descriptionNaphthalene, the simplest of the fused or condensed ring hydrocarbon compounds composed of two benzene rings sharing two adjacent carbon atoms. Naphthalene is the most abundant single constituent of coal tar, a volatile product from the destructive distillation of coal, and is also formed in modern processes for the high-temperature cracking (breaking up of large molecules) of petroleum.
Naphthalene is an important hydrocarbon raw material and is primarily used to manufacture phthalic anhydride and polyvinyl chloride (PVC) plastics, but is also used in moth repellents and toilet deodorant blocks.

Exposure to naphthalene is associated with hemolytic anemia, damage to the liver and neurological system, cataracts and retinal hemorrhage. Naphthalene is reasonably anticipated to be a human carcinogen and may be associated with an increased risk of developing laryngeal and colorectal cancer.
Hemolytic anemia has been reported in infants born to mothers who "sniffed" and ingested naphthalene (as mothballs) during pregnancy. Available data are inadequate to establish a causal relationship between exposure to naphthalene and cancer in humans. EPA has classified naphthalene as a Group C, possible human carcinogen.

1-Methylnaphthalene and 2-methylnaphthalene are naphthalene-related compounds. 1-Methylnaphthalene is a clear liquid and 2-methylnaphthalene is a solid; both can be smelled in air and in water at very low concentrations. 1-Methylnaphthalene and 2-methylnaphthalene are used to make other chemicals such as dyes and resins. 2-Methylnaphthalene is also used to make vitamin K.
naphthalene poisoningNaphthalene is a white solid substance with a strong smell. Poisoning from naphthalene destroys or changes red blood cells so they cannot carry oxygen. This can cause organ damage.

In humans, naphthalene is broken down to alpha-naphthol, which is linked to the development of hemolytic anemia. Kidney and liver damage may also occur. Alpha-naphthol and other metabolites are excreted in urine.

In animals, naphthalene breaks down into other compounds including alpha-naphthol, which may affect the lungs and eyes. Naphthalene was found in the milk of exposed cows, but the residues disappeared quickly after the cows were no longer exposed. Nearly all the naphthalene was broken down into other compounds and excreted in their urine.

References
http://npic.orst.edu/factsheets/naphgen.html
Naphthalene is made from crude oil or coal tar. It is also produced when things burn, so naphthalene is found in cigarette smoke, car exhaust, and smoke from forest fires. It is used as an insecticide and pest repellent. Naphthalene was first registered as a pesticide in the United States in 1948.
Chemical Propertieswhite to almost white crystals, crystalline flakes
UsageNaphthalene was used in liquid-phase exfoliation of graphite in organic solvents for the production of graphene sheets. It was used in preparation of carbon-coated Si 70 Sn 30 nanoparticles. It was used as fluorescent probe to study the aggregation behavior of sodium cholate. It was used to investigate influence of added short chain linear and branched alcohols on the binding of 1:1 complex of naphthalene and β-cyclodextrin.
Air & Water ReactionsHighly flammable. Insoluble in water.
Reactivity ProfileVigorous reactions, sometimes amounting to explosions, can result from the contact between aromatic hydrocarbons, such as Naphthalene, and strong oxidizing agents. They can react exothermically with bases and with diazo compounds. Substitution at the benzene nucleus occurs by halogenation (acid catalyst), nitration, sulfonation, and the Friedel-Crafts reaction. Naphthalene, camphor, glycerol, or turpentine will react violently with chromic anhydride [Haz. Chem. Data 1967. p 68]. Friedel-Crafts acylation of Naphthalene using benzoyl chloride, catalyzed by AlCl3, must be conducted above the melting point of the mixture, or the reaction may be violent [Clar, E. et al., Tetrahedron, 1974, 30, 3296].
Health HazardFire may produce irritating and/or toxic gases. Contact may cause burns to skin and eyes. Contact with molten substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution.
Fire HazardFlammable/combustible material. May be ignited by friction, heat, sparks or flames. Some may burn rapidly with flare burning effect. Powders, dusts, shavings, borings, turnings or cuttings may explode or burn with explosive violence. Substance may be transported in a molten form at a temperature that may be above its flash point. May re-ignite after fire is extinguished.
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