Methylnaphthalene

  • Naphthalene, methyl-
  • Dycar MN
  • Monomethylnaphthalene
  • Sure-Sol 187
  • Tetrosin MNLF
Formula
C11H10
Structure
Description
Bluish-brown oil or a clear yellow liquid. Coal tar or mothball odor.
Uses
Chemical intermediate for methylnaphthalenesulfonate surfactants, naphthalenecarboxylic acids.

Registry Numbers and Inventories.
CAS
1321-94-4
EC (EINECS/ELINCS)
215-329-7
RTECS
QJ9625000
RTECS class
Primary Irritant
UN (DOT)
3082
Beilstein/Gmelin
NA
EPA OPP
54002
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C11H10
Formula mass
142.21
Melting point, °C
-22 (1-methyl) and 34.6 (2-methyl)
Boiling point, °C
232
Vapor pressure, mmHg
23
Density
1.01 g/cm3 (20 C)
Solubility in water
Insoluble
Partition coefficient, pKow
3.87

Hazards and Protection.
Storage
Keep away from heat and flame. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear a NIOSH-approved half face respirator equipped with an organic vapor/acid gas cartridge (specific for organic vapors, HCl, acid gas and SO2) with a dust/mist filter.
Small spills/leaks
If you spill this chemical, FIRST REMOVE ALL SOURCES OF IGNITION. Then, use absorbent paper to pick up all liquid spill material. Your contaminated clothing and absorbent paper should be sealed in a vapor-tight plastic bag for eventual disposal. Solvent wash all contaminated surfaces with 60-70% ethanol followed by washing with a soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.
Stability
No data.
Incompatibilities
Incompatible with strong oxidizing agents Incompatible with peroxides and oxygen.

Fire.
Flash Point,°C
82-97
Fire fighting
Fires involving this material can be controlled with a dry chemical, carbon dioxide or Halon extinguisher. A water spray may also be used.
Fire potential
This chemical is probably combustible.
Hazards
Containers may explode when heated.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure effects
Hemolytic anemia has developed in neonates following in utero exposure. In utero exposure causes cataracts in rats.
   Ingestion
Nausea, vomiting, abdominal pain, diarrhea, and anorexia may occur up to 48 hours following acute ingestion. Nausea may also occur after inhalation exposure.
   Inhalation
Respiratory distress, respiratory failure, and pulmonary edema have been infrequently reported.
   Skin
Erythema and dermatitis are hypersensitivity reactions. One case of exfoliative contact dermatitis has been reported. Anemia may result in pallor.
   Eyes
Facial flushing may occur. Ocular effects from chronic exposure include optic neuritis, lens opacities, and chorioretinitis. Naphthalene is an eye irritant. The vapor causes eye irritation at airborne concentrations of 15 ppm. Eye contact with the solid material may result in inflammation of the eye, superficial injury to the cornea, diminished visual acuity, and other effects. It may cause cataracts.

First aid
 
   Ingestion
DO NOT INDUCE VOMITING. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. Be prepared to transport the victim to a hospital if advised by a physician.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
3082
Response guide
Hazard class
9
Packing Group
III
 
32. Aromatic hydrocarbons