Methyl alcohol

  • Methanol
  • Wood alcohol
  • Columbian spirits
  • Carbinol
Formula
CH3OH
Structure
Description
Colorless liquid, with a mild, characteristic alcohol odor when pure.
Uses
Industrial solvent, raw material for formaldehyde, methyl esters, organic & inorg acids, antifreeze, fuel, extractant for animal & vegetable oils, to denature ethanol, manufacture pharmaceuticals, solvent in manufacture of streptomycin, vitamins, hormones, polymers, plastics.

Registry Numbers and Inventories.
CAS
67-56-1
EC (EINECS/ELINCS)
200-659-6
EC Index Number
603-001-00-X
EC Class
Highly flammable; Toxic
R 11 23/24/25 39/23/24/25
S 7 16 24 45
RTECS
PC1400000
RTECS class
Drug; Mutagen; Reproductive Effector; Human Data; Primary Irritant
UN (DOT)
1230
Merck
13,5984
Beilstein/Gmelin
1098229
Beilstein Reference
4-01-00-01227
RCRA
U154
EPA OPP
53801
Swiss Giftliste 1
G-2063
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CH4O
Formula mass
32.04
Melting point, °C
-98
Boiling point, °C
64.6
Vapor pressure, mmHg
127 (25 C)
Vapor density (air=1)
1.11
Saturation Concentration
12.6% at 20 C
Evaporization number
5.9 (butyl acetate=1)
Odor Threshold Odor threshold 2,000 ppm
Critical temperature
240.0
Critical pressure
78.5
Density
0.7918 g/cm3 (20 C)
Solubility in water
Miscible
Viscosity
0.614 MPa sec
Surface tension
22.61 g/s2 (at 20 C)
Refractive index
1.33066 (20 C)
Dipole moment
1.7 D (20 C)
Dielectric constant
32.6 (25 C)
Partition coefficient, pKow
-0.77
Heat of fusion
3.2 kJ/mol
Heat of vaporization
39.2 kJ/mol
Heat of combustion
-723 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Flammables-area.
B2 D1B D2A D2B
Handling
Use spark-proof tools and explosion proof equipment. Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes. Use only in a chemical fume hood.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition.
Disposal code
1
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Reducing agents, acid chlorides, active metals, alkali metals, liquid chlorine, magnesium, sodium hypochlorite, potassium, chloroform, acids (mineral, oxidizing, e.g. chromic acid, hypochlorous acid, nitric acid, sulfuric acid), oxidizing agents (strong, e.g. bromine, hydrogen peroxide, nitrogen dioxide, potassium nitrate), acid anhydrides, cyanuric chloride, diethyl zinc, perchloric acid, potassium-tert-butoxide.
Decomposition
Carbon monoxide, carbon dioxide, formaldehyde.

Fire.
Flash Point,°C
11
Autoignition, °C
455
Upper exp. limit, %
36
Lower exp. limit, %
6.0
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. To extinguish fire, use water fog, dry chemical, carbon dioxide, or regular foam.
Fire potential
Flammable liquid and vapor. Will burn, may be ignited by heat, sparks and flames.
Hazards
Flammable vapor may spread away from spill. Container may explode in heat of fire. Flashback upon vapor trail may occur.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
3
 
 
Reactivity
0
 

Health.
Exposure limit(s)
OSHA PEL: TWA 200 ppm (260 mg/m3) NIOSH REL: TWA 200 ppm (260 mg/m3) ST 250 ppm (325 mg/m3) skin NIOSH IDLH: 6000 ppm
Poison_Class
3
Exposure effects
Prolonged or repeated skin contact may cause dermatitis. Marked impairment of vision has been reported.
   Ingestion
Toxic. Symptoms parallel inhalation. Can intoxicate and cause blindness. Usual fatal dose: 100-125 milliliters.
   Inhalation
A slight irritant to the mucous membranes. Toxic effects exerted upon nervous system, particularly the optic nerve. Once absorbed into the body, it is very slowly eliminated. Symptoms of overexposure may include headache, drowsiness, nausea, vomiting, blurred vision, blindness, coma, and death. A person may get better but then worse again up to 30 hours later.
   Skin
Methyl alcohol is a defatting agent and may cause skin to become dry and cracked. Skin absorption can occur; symptoms may parallel inhalation exposure.
   Eyes
Irritant. Continued exposure may cause eye lesions.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately. Induce vomiting by giving one teaspoon of Syrup of Ipecac.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1230
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
MAL
 
20 Alcohols, Glycols
HS Code
2905 11 00
 
Std. Transport #
4907828
 
IMO Chemical Code
18
IMO Pollution Category
D