3,4-Dichlorophenol

  • 4,5-Dichlorophenol
  • Phenol, 3,4-dichloro-
Formula
3,4-(Cl)2C6H3OH
Structure
Description
Needles (from benzene, petroleum ether) or light brown and yellow crystals.
Uses
Chemical intermediate for 2-chloro-1,4-dihydroxyanthraquinone & 2,3,4-trichlorophenol.

Registry Numbers and Inventories.
CAS
95-77-2
EC (EINECS/ELINCS)
202-450-5
EC Class
irritant
R 21/22 36/37/38
S 24 26 36/37/39
RTECS
SK8800000
RTECS class
Other
UN (DOT)
2020
Beilstein/Gmelin
1907693
Beilstein Reference
4-06-00-00952
Canada DSL/NDSL
NDSL
US TSCA
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H4Cl2O
Formula mass
163.00
Melting point, °C
66 - 68
Boiling point, °C
247
Vapor pressure, mmHg
0.017 (25 C)
Vapor density (air=1)
5.6
Odor Threshold Odor threshold 100 ug/L in water
Critical temperature
473
Critical pressure
50.1
Density
1.6 g/cm3
Solubility in water
Insoluble
pKa/pKb
8.55 (pKa)
Partition coefficient, pKow
3.33
Heat of vaporization
50.4 kJ/mol
Heat of combustion
-2749 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container.
Handling
Wash thoroughly after handling. Do not breathe dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Use only in a chemical fume hood.
Protection
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
Vacuum or sweep up material and place into a suitable disposal container.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents, acid chlorides, acid anhydrides.
Decomposition
Hydrogen chloride, carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
109
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. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.
Fire potential
This material is probably combustible.
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.
Exposure effects
Prolonged exposure can cause damage to the eyes, severe irritation or burns.
   Ingestion
Harmful if swallowed. May cause irritation of the digestive tract. May cause burning sensations, coughing, wheezing, laryngitis, shortness of breath and headache.
   Inhalation
May cause respiratory tract irritation. Exposure produces central nervous system depression. May be harmful if inhaled. May cause liver damage.
   Skin
Causes skin irritation. May be harmful if absorbed through the skin.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   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
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
2020
Response guide
Hazard class
6.1
Packing Group
III
 
HS Code
2908 10 00