Phthalic anhydride is a white organic compound that has a characteristic acrid odour. It is soluble in water, alcohols and other organic solvents. Phthalic anhydride is the anhydride of phthalic acid, produced by the catalytic oxidation of orthoxylene or naphtalene.
Phthalic anhydride is an economical and versatile intermediate in organic chemistry. See Applications for more detailed information on its diverse uses.
Synonyms: 1,3-isobenzofurandione; 1,3-dioxophthalan; 1,3-dioxophthalane; 1,2-benzenedicarbonic acid, anhydride; 1,2-benzene dicarboxylic acid anhydride; 1,2-Benzenedicarboxylic Anhydride
Applications of Phthalic Anhydride
Phthalic anhydride is primarily used as a chemical intermediate and as a monomer for use in polymer formations. It is widely used in the production of unsaturated polyester resins (UPR) which in turn are used in reinforced plastics for a vast range of applications such as in the electronics and construction industries as well as in bathroom fixtures, pleasure boats and automobile parts.
Its usage in the production of alkyd resins is also significant, these resins in turn being used in end products such as paints, lacquers and coatings. It is also used as a raw material for the manufacture of phthalate PVC and general purpose plasticizers, and as a starting material in the production of other chemicals including polyester polyols and saccharin. It is also found in certain pigments and dyes and in flame retardants.
Storage and Handling
Phthalic anhydride should be stored in tightly-sealed containers in a cool, dry place away from water, acids, strong oxidizing agents, alcohols, amines and bases.
The material should be handled in accordance with good industry safety and hygiene practices. Relevant engineering controls including good exhaust ventilation should be implemented. Inhalation of dust can cause irritation of the respiratory tract and symptoms of allergy or asthma. It is a severe skin irritant, particularly to wet skin, and may cause allergic dermatitis. It is a severe eye irritant and may cause corneal and conjunctival damage. Appropriate personal protective equipment should be worn. Refer to product SDS for further guidance.