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Phthalic anhydride

Details for Phthalic anhydride

Phthalic anhydride



Phthalic anhydride
CAS NO: 85-44-9
EC NO: 201-607-5
Molecular Formula: C8H4O3
Molecular Weight: 148.12
InChI: InChI=1/C16H10O7/c17-13(18)9-5-1-3-7-11(9)15(21)23-16(22)12-8-4-2-6-10(12)14(19)20/h1-8H,(H,17,18)(H,19,20)
Product description:

Physicochemical properties

Color and odor status: white needle-like crystals with a slight odor

Toxicity: Poisoning

Flammability: combustible 

Density: 1.53

Corrosion: acid corrosion

Boiling point: 295 °C 

Stability: stable

Alkalinity or acidity: acidity

Flash point: 152 °C

Melting point: 131-134 °C

Moisture absorption: moisture absorption, avoid contact with humid air  

Solubility: hardly soluble in cold water, soluble in hot water and ether, ethanol, benzene and pyridine, and can undergo hydrolysis, alcoholysis and aminolysis reactions


Phthalic anhydride is one of the most important organic chemical raw materials, used as plasticizers, production resins, dyes and pigments, a variety of paints, food additives, medicines, pesticides, coatings, saccharin, intermediates, insecticides, fungicides, additives Agents, photosensitive materials, etc.

Hazard category

8.1 acid corrosive products

Fire-fighting measures

Extinguishing agent: alcohol-resistant foam, dry powder, carbon dioxide. Do not shoot water directly to the molten material, so as not to cause serious fire or violent boiling

Emergency treatment

Inhalation: quickly leave the scene to fresh air. Keep the airway unobstructed. If breathing is difficult, give oxygen. If breathing stops, give artificial respiration immediately. Seek medical attention

Ingestion: Rinse mouth with water and drink milk or egg white by mistake. Seek medical attention

Skin contact: Take off contaminated clothing immediately and rinse with plenty of running water for at least 15 minutes. Seek medical attention

Eye contact: Lift the eyelid immediately, and rinse thoroughly with plenty of running water or normal saline for at least 15 minutes. Seek medical attention

Packaging, storage, transportation

Lined with plastic bag, 25kg/bag. Store in a cool, dry and well-ventilated warehouse. Prevent rain and sun. It should be stored separately from oxidants, reducing agents, acids, and edible chemicals, and avoid mixed storage. Avoid exposure to the sun, rain, and high temperature during transportation. Transport as required by dangerous goods

Synonyms: 2,5-Isobenzofurandione;2-benzofuran-1,3-dione;2,2'-(oxydicarbonyl)dibenzoic acid;o-Phthalic anhydride;
Molecular Structure: Phthalic anhydride 85-44-9
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