4-Aminobenzoic acid

  • p-Aminobenzoic acid
  • 1-Amino-4-carboxybenzene
Formula
NH2C6H4COOH
Structure
Description
White to tan crystalline powder.
Uses
Manufacture of various esters (local anesthetics), folic acid, and azo dyes,. Used in laboratories as sulfonamide antagonist.

Registry Numbers and Inventories.
CAS
150-13-0
EC (EINECS/ELINCS)
205-753-0
R 36/37/38 42/43
S 22 26 36/37/39 45
RTECS
DG1400000
RTECS class
Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
3335
Merck
13,422
Beilstein/Gmelin
471605
Beilstein Reference
4-14-00-01126
EPA OPP
233300
Swiss Giftliste 1
G-3297
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C7H7NO2
Formula mass
137.14
Melting point, °C
188
Boiling point, °C
340
Vapor pressure, mmHg
3E-5 (25 C)
Density
1.45 g/cm3 (20 C)
Solubility in water
Very soluble
Refractive index
1.5795
pKa/pKb
4.65 (pKa)
Partition coefficient, pKow
0.01
Heat of fusion
24.0 kJ/mol
Heat of vaporization
61.6 kJ/mol

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Wash hands before eating. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
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
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents. Darkens upon exposure to light, air or moisture.
Decomposition
Carbon monoxide, oxides of nitrogen, carbon dioxide.

Fire.
Flash Point,°C
159
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, dry chemical, chemical foam, or alcohol-resistant foam.
Health
0
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
May cause reproductive and fetal effects. Cancer suspect agent.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Overexposure may cause methemoglobinemia.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation.
   Eyes
May cause 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.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
   Skin
Get medical aid if irritation develops or persists. Wash clothing before reuse. Flush skin with plenty of soap and water.
   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
3335
Response guide
HS Code
2922 49 95