Methanesulfonic acid

  • Methylsulfonic acid
  • MSA
  • MCAT 1201
Formula
CH3SO3H
Structure
Description
Colorless liquid at room temperature or white crystalline solid below 20 deg c.
Uses
Catalyst in esterification, alkylation, olefin polymerization, peroxidation reactions, chemical intermediate to form secondary methane sulfonates from olefins, chemical intermediate for trifluoromethane sulfonic acid, methane sulfonyl chloride, as solvent.

Registry Numbers and Inventories.
CAS
75-75-2
EC (EINECS/ELINCS)
200-898-6
EC Index Number
607-145-00-4
EC Class
Corrosive
S 26 36 45
RTECS
PB1140000
RTECS class
Agricultural Chemical and Pesticide; Mutagen
UN (DOT)
2586
Merck
13,5981
Beilstein/Gmelin
1446024
Beilstein Reference
4-04-00-00010
Swiss Giftliste 1
G-3213
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CH4O3S
Formula mass
96.11
Melting point, °C
20
Boiling point, °C
217
Vapor pressure, mmHg
0.0004 (25 C)
Vapor density (air=1)
>AIR
Density
1.502 g/cm3 (0 C)
Solubility in water
Very soluble
Viscosity
11.21 cp (25 C)
Surface tension
49.39 g/s2 (32 C)
Refractive index
1.424 (25 C)
pKa/pKb
Strong acid
Partition coefficient, pKow
-0.90

Hazards and Protection.
Storage
Store in a tightly closed container. Keep under an argon blanket. Store in a cool, dry, well-ventilated area away from incompatible substances. Corrosives area.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale. Do not allow contact with water. Wash clothing before reuse. Discard contaminated shoes.
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. Provide ventilation. Do not get water inside containers.
Disposal code
4
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Moisture, HF, Bases, Amines, Strong reducing agents, corrodes steel, ethylvinyl ether, iron, copper, brass, lead.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide.

Fire.
Flash Point,°C
189
Autoignition, °C
> 500
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Reacts violently with water. Extinguishing media: Use dry chemical, carbon dioxide, or alcohol-resistant foam. Do NOT get water inside containers. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
0
 
 
Reactivity
2
 

Health.
Poison_Class
2
Exposure effects
Abnormal neuropsychologic function has been reported following hydrochloric acid exposure from a leaking tanker truck.
   Ingestion
Harmful if swallowed. Causes gastrointestinal tract burns.
   Inhalation
Causes severe respiratory tract irritation.
   Skin
Contact with liquid is corrosive and causes severe burns and ulceration.
   Eyes
Contact with liquid is corrosive to the eyes and causes severe burns.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   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 immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Discard contaminated clothing in a manner which limits further exposure. Destroy contaminated shoes.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
2586
Response guide
Hazard class
8
Packing Group
III
 
HS Code
2904 10 00
 
IMO Pollution Category
C