Phthalic acid

  • 1,2-Benzenedicarboxylic acid
  • o-Dicarboxybenzene
Formula
C6H4(COOH)2
Structure
Description
Colorless or white crystalline material or powder.
Uses
Dyes, phenolphthalein, phthalimide, anthranilic acid, synthetic perfumes, laboratory reagent.

Registry Numbers and Inventories.
CAS
88-99-3
EC (EINECS/ELINCS)
201-873-2
EC Class
irritant
R 36/37/38
RTECS
TH9625000
RTECS class
Mutagen; Reproductive Effector
Merck
12,7527
Beilstein/Gmelin
608199
Beilstein Reference
4-09-00-03167
Swiss Giftliste 1
G-2026
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H6O4
Formula mass
166.13
Melting point, °C
79
Boiling point, °C
315-317
Vapor pressure, mmHg
2E-6 (25 C)
Vapor density (air=1)
5.73
Saturation Concentration
Very low at 25 C.
Evaporization number
Probably very low at normal temperatures.
Critical temperature
527
Critical pressure
39.0
Density
1.576 g/cm3
Solubility in water
5.7 g/L
pKa/pKb
2.76 (pKa)
Partition coefficient, pKow
0.73
Heat of fusion
36.5 kJ/mol
Heat of vaporization
66.1 kJ/mol
Heat of combustion
-3224 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Insufficient information
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. 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
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
Vacuum or sweep up material and place into a suitable disposal container. Avoid generating dusty conditions. Provide ventilation.
Disposal code
4
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Strong oxidizing materials.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
205
Autoignition, °C
496
Upper exp. limit, %
7.7
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. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Health
2
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Prolonged or repeated skin contact may cause dermatitis.
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
Causes respiratory tract irritation.
   Skin
May cause skin irritation. May cause dermatitis.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   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. Immediately 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.
4. Organic acids
HS Code
2917 39 80