Paraldehyde

  • Paracetaldehyde
  • 2,4,6-Trimethyl-1,3,5-trioxane
  • Triacetaldehyde
Formula
C6H12O3
Structure
Description
A clear colorless liquid with a pleasant odor.
Uses
Substitute for acetaldehyde, manufacture dyestuff intermediates, solvent for fats, oils, waxes, gums, resins, leather, mixtures for cellulose derivatives.

Registry Numbers and Inventories.
CAS
123-63-7
EC (EINECS/ELINCS)
204-639-8
EC Index Number
605-004-00-1
EC Class
Highly flammable
S 9 16 29 33
RTECS
YK0525000
RTECS class
Drug; Human Data; Primary Irritant
UN (DOT)
1264
Merck
12,7160
Beilstein/Gmelin
80142
Beilstein Reference
5-19-09-00112
RCRA
U182
Swiss Giftliste 1
G-2691
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H12O3
Formula mass
132.16
Melting point, °C
12
Boiling point, °C
124
Vapor pressure, mmHg
10 (20 C)
Vapor density (air=1)
4.5
Odor Threshold Odor threshold 0.02-0.025 mg/m3
Critical temperature
290
Density
1.0037 g/cm3 (10 C)
Solubility in water
Slightly soluble
Viscosity
1.128 cp at 70 deg f
Surface tension
26.5 g/s2 (15 C)
Refractive index
1.403 (20 C)
Dipole moment
1.92 D
Dielectric constant
11.8 (20 C)
Partition coefficient, pKow
0.67
Heat of fusion
13.8 kJ/mol
Heat of vaporization
41.5 kJ/mol
Heat of combustion
-3122 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Flammables-area.
Handling
Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Avoid contact with heat, sparks and flame. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Personal wear rubber gloves, self-contained breathing apparatus. Wear appropriate chemical protective gloves, boots, and goggles.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use. Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Clean up spills immediately, using the appropriate protective equipment.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Incompatible with alkalis, hydrocyanic acid iodides and oxidizers.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
26
Autoignition, °C
235
Upper exp. limit, %
17.0
Lower exp. limit, %
1.3
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water in flooding quantities as fog. Solid streams of water may spread fire. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use alcohol foam, dry chemical or carbon dioxide.
Fire potential
Flammable liquid
Hazards
Vapors are heavier than air and may travel to a source of ignition and flash back.
Combustion products
Emits toxic fumes on heating.
Health
2
 
Flammability
3
 
 
Reactivity
1
 

Health.
Poison_Class
4
Exposure effects
Symptoms ranging from drowsiness to coma may be seen and are not strictly dose-related. Coma may be seen with doses ranging from 31 to 120 ml orally.
   Inhalation
Inhalation of vapors may cause headache, nausea, dizziness, fatigure and weakness in the arms and legs.
   Skin
May cause irritation or burns.
   Eyes
See Skin.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately. Do NOT induce vomiting. Allow the victim to rinse his mouth and then to drink 2-4 cupfuls of water, and seek medical advice.
   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. Remove contaminated clothing and shoes.
   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
1264
Response guide
Hazard class
3
Packing Group
III
 
USCG CHRIS Code
PDH
 
HS Code
2912 50 00
 
Std. Transport #
4909260
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
S/P