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A6174212

Naphthalene , StandardforGC,≥99.5%(GC) , 91-20-3

Synonym(s):
Naphthalene

CAS NO.:91-20-3

Empirical Formula: C10H8

Molecular Weight: 128.17

MDL number: MFCD00001742

EINECS: 202-049-5

Update time: 2022-07-08

PRODUCT 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
Flash point: 174 °F
storage temp.  Store below +30°C.
solubility  methanol: soluble50mg/mL, clear, colorless
form  Faint beige to brown to salmon red powder
color  White to almost white
Specific Gravity 1.145
Odor at 10.00 % in benzyl benzoate. pungent dry tarry
Odor Type pungent
explosive limit 0.9-5.9%(V)
Water Solubility  30 mg/L (25 ºC)
Merck  14,6370
BRN  1421310
Henry's Law Constant 5.64 at 25 °C (thermodynamic method-GC/UV spectrophotometry, Altschuh et al., 1999)
Dielectric constant 2.5(85℃)
Exposure limits TLV-TWA 10 ppm (~50 mg/m3) (ACGIH, MSHA, and OSHA); STEL 15 ppm (~75 mg/m3) (ACGIH); IDLH 500 ppm.
InChIKey UFWIBTONFRDIAS-UHFFFAOYSA-N
LogP 3.7 at 25℃

Description and Uses

Naphthalene occurs as transparent prismatic plates also available as white scales, powder balls, or cakes with a characteristic mothball or strong coal tar and aromatic odour. It is sparingly soluble in water but soluble in methanol/ethanol and very soluble in ether. Naphthalene is a commercially important aromatic hydrocarbon. Naphthalene occurs as a white solid or powder. Naphthalene occurs in coal tar in large quantities and is easily isolated from this source in pure condition. It volatilises and sublimes at room temperature above the melting point. The primary use for naphthalene is in the production of phthalic anhydride, also of carbamate insecticides, surface active agents and resins, as a dye intermediate, as a synthetic tanning agent, as a moth repellent, and in miscellaneous organic chemicals. Naphthalene is used in the production of phthalic anhydride; it is also used in mothballs. Naphthalene is also used in the manufacture of phthalic and anthranilic acids to make indigo, indanthrene, and triphenyl methane dyes, for synthetic resins, lubricant, celluloid, lampblack, smokeless powder, and hydronaphthalenes. Naphthalene is also used in dusting powders, lavatory deodorant discs, wood preservatives, fungicide, and as an insecticide. It has been used as an intestinal antiseptic and vermicide and in the treatment of pediculosis and scabies.

In addition to oxidation and reduction reactions, naphthalene readily undergoes substitutionreactions such as nitration, halogenation, sulfonation, and acylation to produce a varietyof other substances, which are used in the manufacture of dyes, insecticides, organic solvents,and synthetic resins. The principal use of naphthalene is for the production of phthalic anhydride,C8H4O3.
Naphthalene is catalytically oxidized to phthalic anhydride: 2C10H8 + 9O2 → 2C4H8O3 +4CO2 + 4H2O using metal oxide catalysts. Phthalic anhydride is used to produce plastics,phthalate plasticizers, insecticides, pharmaceuticals, and resins. Sulfonation of naphthalene withsulfuric acid produces naphthalenesulfonic acids, which are used to produce naphthalene sulfonates.Naphthalene sulfonates are used in various formulations as concrete additives, gypsumboard additives, dye intermediates, tanning agents, and polymeric dispersants. Naphthalene isused to produce carbamate insecticides such as carbaryl, which is a wide-spectrum, generalpurposeinsecticide.

Safety

Symbol(GHS) 
GHS02,GHS07,GHS08,GHS09
Signal word  Warning
Hazard statements  H228-H302-H351-H410
Precautionary statements  P202-P210-P240-P273-P301+P312-P308+P313
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
OEB A
OEL TWA: 10 ppm (50 mg/m3), STEL: 15 ppm (75 mg/m3)
RIDADR  UN 1334 4.1/PG 3
WGK Germany  3
RTECS  QJ0525000
Autoignition Temperature 978 °F
TSCA  Yes
HazardClass  4.1
PackingGroup  III
HS Code  29029010
Toxicity Acute oral LD50 for guinea pigs 1,200 mg/kg, mice 533 mg/kg, rats 1,250 mg/kg (quoted, RTECS, 1985).
IDLA 250 ppm

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