Acetal

  • 1,1-Diethoxyethane
  • Diethylacetal
  • Ethylidene diethylether
  • USAF DO-45
Formula
CH3CH(OC2H5)2
Structure
Description
Colorless liquid, pungent, green woody solvent odor.
Uses
Solvent, in organic syntheses, formerly hypnotic.

Registry Numbers and Inventories.
CAS
105-57-7
EC (EINECS/ELINCS)
203-310-6
EC Index Number
605-015-00-1
EC Class
Highly flammable; Irritant
R 11 36/38
S 9 16 33
RTECS
AB2800000
RTECS class
Primary Irritant
UN (DOT)
1088
Merck
13,40
Beilstein/Gmelin
1098310
Beilstein Reference
4-01-00-03103
Swiss Giftliste 1
G-1491
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H14O2
Formula mass
118.18
Melting point, °C
-100
Boiling point, °C
102.7
Vapor pressure, mmHg
28
Vapor density (air=1)
4.08
Saturation Concentration
2.6 x 10(4) ppm (2.6%) at 20 C (calculated)
Critical temperature
266
Critical pressure
31.78
Density
0.8461 g/cm3 (0 C)
Solubility in water
Miscible
Viscosity
0.45 cp (20 C)
Surface tension
21.65 g/s2 @ 20 C
Refractive index
1.38 (20 C)
Partition coefficient, pKow
0.84
Heat of vaporization
42.30 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Regularly check inhibitor levels to maintain peroxide levels below 1%. Storage under a nitrogen blanket has been recommended. After opening, purge container with nitrogen before reclosing. Periodically test for peroxide formation on long-term storage. Addition of water or appropriate reducing materials will lessen peroxide formation.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. If peroxide formation is suspected, do not open or move container. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
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. A vapor suppressing foam may be used to reduce vapors. Water spray may reduce vapor but may not prevent ignition in closed spaces.
Disposal code
1
Stability
Stable under normal temperatures and pressures. Distillation may lead to the formation of peroxides. Forms heat-sensitive explosive peroxides on contact with air.
Incompatibilities
Oxidizing agents.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
-21
Autoignition, °C
230
Upper exp. limit, %
10.4
Lower exp. limit, %
1.6
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Extremely flammable liquid. Extinguishing media: Use water spray to cool fire-exposed containers. Use agent most appropriate to extinguish fire. For large fires, use water spray, fog or alcohol-resistant foam. Do NOT use straight streams of water. For small fires, use carbon dioxide, dry chemical, dry sand, or alcohol-resistant foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Dangerous, due to fire and explosion hazards. Dangerous, when exposed to heat or flame
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May react with oxygen to form explosive peroxides. Old samples may explode on heating.
Combustion products
Explosive In fire, may decompose to form flammable or explosive mixtures in air.
Health
1
 
Flammability
3
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation. May cause drowsiness, unconsciousness, and central nervous system depression. Vapors may cause dizziness or suffocation.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
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
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Immediately 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
1088
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
AEL
 
HS Code
2911 00 00
 
Std. Transport #
4908103