1-Methylnaphthalene , Analysis standard , 90-12-0
Synonym(s):
α-Methylnaphthalene;1-Methylnaphthalene;1-MN
CAS NO.：90-12-0
Empirical Formula: C11H10
Molecular Weight: 142.2
MDL number: MFCD00004034
EINECS: 201-966-8
PRODUCT Properties
| Melting point: | −22 °C(lit.) |
| Boiling point: | 240-243 °C(lit.) |
| Density | 1.001 g/mL at 25 °C(lit.) |
| vapor pressure | 2 hPa (25 °C) |
| refractive index | n |
| FEMA | 3193 | 1-METHYLNAPHTHALENE |
| Flash point: | 180 °F |
| storage temp. | Store below +30°C. |
| solubility | 0.026g/l |
| pka | 37(at 25℃) |
| form | Liquid |
| color | Clear colorless to yellow |
| Odor | at 1.00 % in dipropylene glycol. naphthyl chemical medicinal camphor |
| Odor Type | naphthyl |
| explosive limit | 0.7-6.5%(V) |
| Water Solubility | 0.026 g/L (25 ºC) |
| JECFA Number | 1335 |
| BRN | 506793 |
| Dielectric constant | 2.7（20℃） |
| Exposure limits | ACGIH: TWA 0.5 ppm (Skin) |
| Stability: | Stable. Combustible. Incompatible with strong oxidizing agents, oxygen. |
| InChIKey | QPUYECUOLPXSFR-UHFFFAOYSA-N |
| LogP | 3.91 |
| CAS DataBase Reference | 90-12-0(CAS DataBase Reference) |
| NIST Chemistry Reference | Naphthalene, 1-methyl-(90-12-0) |
| EPA Substance Registry System | 1-Methylnaphthalene (90-12-0) |
Description and Uses
1-methylnaphthalene is a methylnaphthalene carrying a methyl substituent at position. It is a polycyclic aromatic hydrocarbon (PAH). It is present in cigarette smoke, wood smoke, tar, asphalt, and at some hazardous waste sites. The main use of 1-methylnaphthalene is as a raw material for naphthoic acid, fluorescent whitening agents, and surfactants. It is also used as a raw material for dyestuff dispersants and heat transfer oils, and as a solvent for agricultural chemical.
The main uses of methylnaphthalene are as a raw material for dyestuff dispersants and heat transfer oils, and as a solvent for agricultural chemical. It is used in insecticide manufacturing; manufacture of phthalic anhydride; solvent in organic synthesis; asphalt and naptha constituent. It is also used as a test substance for the determination of the cetane number of diesel fuels. Further, it is employed in the preparation of 1-methylnaphthalene-d10 using deuterium oxide, sodium deuteroxide.
Safety
| Symbol(GHS) |    GHS07,GHS08,GHS09 |
| Signal word | Danger |
| Hazard statements | H302-H304-H411 |
| Precautionary statements | P273-P301+P310+P331-P301+P312+P330 |
| Hazard Codes | Xn,N,T |
| Risk Statements | 22-36/37/38-42/43-51/53-39/23/24/25-23/24/25-20/21/22 |
| Safety Statements | 7-26-36/37/39-61-45-36/37-23-36 |
| RIDADR | UN 3082 9/PG 3 |
| WGK Germany | 2 |
| RTECS | QJ9630000 |
| Autoignition Temperature | 984 °F |
| TSCA | Yes |
| HazardClass | 9 |
| PackingGroup | III |
| HS Code | 29029080 |
| Hazardous Substances Data | 90-12-0(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: 1840 mg/kg |
