1,4-Butynediol

  • 2-Butyne-1,4-diol
  • Butynediol
  • But-2-yne-1,4-diol
Formula
C4H6O2
Structure
Description
White to light-brown solid or brownish-yellow aqueous solution.
Uses
Intermediate, corrosion inhibitor, electroplating brightener, defoliant, polymerization accelerator, stabilizer for chlorinated hydrocarbons, cosolvent for paintermediate & varnish removal.

Registry Numbers and Inventories.
CAS
110-65-6
EC (EINECS/ELINCS)
203-788-6
EC Index Number
603-076-00-9
EC Class
Toxic; Harmful; Corrosive
R 21 23/25 34 48/22
S 26 36/37/39 45
RTECS
ES0525000
RTECS class
Tumorigen; Reproductive Effector
UN (DOT)
2716
Beilstein/Gmelin
1071237
Beilstein Reference
4-01-00-02687
Swiss Giftliste 1
G-2033
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C4H6O2
Formula mass
86.09
Melting point, °C
55 - 58
Boiling point, °C
238
Decomposition point, °C
158 - 159
Vapor pressure, mmHg
0.008 (25 C)
Critical temperature
407
Critical pressure
62.4
Density
1.1001 g/cm3 (20 C)
Solubility in water
Very soluble
Refractive index
1.4804 (20 C)
pKa/pKb
12.72 (pKa)
Partition coefficient, pKow
-1.10
Heat of vaporization
55.2 kJ/mol
Heat of combustion
-2204 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.
Handling
Wash thoroughly after handling. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Use with adequate ventilation. Wash clothing before reuse.
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 neoprene gloves, apron, and/or clothing. Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear neoprene gloves, apron, and/or clothing. Wear appropriate protective clothing to prevent skin exposure.
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.
Small spills/leaks
Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Remove all sources of ignition. Provide ventilation. Do not get water inside containers.
Disposal code
9
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Strong acids, strong bases.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
152
Autoignition, °C
410
Upper exp. limit, %
35.7
Lower exp. limit, %
2.3
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Combustible material; may burn but does not ignite readily. Extinguishing media: Do NOT get water inside containers. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
May burn but does not ignite readily.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. May polymerize explosively when heated or involved in a fire. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
3
Exposure effects
Prolonged or repeated skin contact may cause dermatitis. Effects may be delayed.
   Ingestion
Harmful if swallowed. Causes digestive tract irritation with possible burns.
   Inhalation
Can produce delayed pulmonary edema. Causes respiratory tract irritation with possible burns.
   Skin
May cause dermatitis. Causes severe skin irritation and possible burns.
   Eyes
Causes eye irritation and possible burns. May cause chemical conjunctivitis.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
2716
Response guide
Hazard class
6.1
Packing Group
III
 
USCG CHRIS Code
BTD
 
HS Code
2905 39 80
 
Std. Transport #
4925125