Benzoquinone

  • 2,5-Cyclohexadiene-1,4-dione
  • p-Quinone
  • Quinone
  • 1,4-Benzoquinone
Formula
4-(O=)C6H4=O
Structure
Description
Yellow solid, acrid chlorine-like odor.
Uses
Tanning hides, making gelatin insol, strengthening animal fibers.

Registry Numbers and Inventories.
CAS
106-51-4
EC (EINECS/ELINCS)
203-405-2
EC Index Number
606-013-00-3
EC Class
Toxic; Irritant; Dangerous for the Environment
R 23/25 36/37/38 50
S 26 28 45 61
RTECS
DK2625000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen
UN (DOT)
2587
Merck
12,8259
Beilstein/Gmelin
773967
Beilstein Reference
4-07-00-02065
RCRA
U197
EPA OPP
59805
Swiss Giftliste 1
G-1228
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H4O2
Formula mass
108.10
Melting point, °C
112 - 114
Boiling point, °C
174
Vapor pressure, mmHg
1.2 (25 C)
Vapor density (air=1)
3.7
Saturation Concentration
118 ppm (0.01%) at 20 C (calculated)
Odor Threshold Odor threshold 0.4000 mg/m3
Density
1.318 g/cm3 (20 C)
Solubility in water
10 g/L
Viscosity
3.2585x10-2 n/m @ melting point
Surface tension
31.81 g/s2 (124 C)
Partition coefficient, pKow
0.20
Heat of vaporization
41.0 kJ/mol
Heat of combustion
-2757 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. May form flammable dust-air mixtures. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale.
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
Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Remove all sources of ignition. Provide ventilation.
Disposal code
9
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents. Attacks some forms of coatings, plastics and rubber.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
59
Autoignition, °C
560
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam.
Fire potential
Combustible.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Combustion products
Contain irritating and toxic fumes, including carbon dioxide and carbon monoxide.
Health
3
 
Flammability
2
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: 0.1 ppm; 0.44 mg/m3 (as TWA) (ACGIH 1997). OSHA PEL: TWA 0.4 mg/m3 (0.1 ppm) NIOSH REL: TWA 0.4 mg/m3 (0.1 ppm) NIOSH IDLH: 100 mg/m3
Poison_Class
3
Exposure effects
Prolonged or repeated exposure may cause permanent eye damage.
   Ingestion
Harmful if swallowed. May cause irritation of the digestive tract. Ingestion may cause convulsion, respiratory difficulties and decreased blood pressure.
   Inhalation
Causes respiratory tract irritation. May cause adverse central nervous system effects including headache, convulsions, and possible death. May produce asphyxia due to pulmonary damage and effects on the hemoglobin. May produce clonic convulsions, respiratory difficulties, decreased blood pressure and death due to medullary centers.
   Skin
Causes skin irritation. Depigmentation and skin lesions may occur. May cause discoloration, erythema, swelling, and the formation of papules and vesicles. Prolonged contact may lead to necrosis.
   Eyes
Causes severe eye burns. Contact may cause discoloration, redness, swelling, and formation of eye lesions. May cause corneal edema, ulceration, and scarring. Prolonged exposure to vapor can lead to gradual deposition of pigment in the cornea and conjunctiva which may result in severe visual disturbances. Causes small opacities of the cornea and structural corneal changes that result in in loss of visual activity. Contact may cause discoloration, redness, swelling and formation of eye lesions.

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. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed.

Transport.
UN number
2587
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
BZQ
 
HS Code
2914 69 90
 
Std. Transport #
4921544