Phthalic Anhydride (C8H4O3)

Physical Properties:

Appearance: White, needle-like crystals with a characteristic odor

Melting Point: 130.8°C

Boiling Point: 284°C

Density: 1.53 g/cm³

Flash Point: 152°C

Solubility: Insoluble in cold water, slightly soluble in hot water, soluble in ethanol, pyridine, benzene, carbon disulfide, and other organic solvents

Chemical Properties:

1.Phthalic Anhydride is moderately flammable and moisture-sensitive.

2.It hydrolyzes rapidly in the presence of water, forming phthalic acid.

3.It has a characteristic, acrid odor that can be irritating to the eyes, nose, throat, and skin.

Applications:

Phthalic Anhydride is a versatile chemical with numerous industrial uses, including:

1.Plasticizers: It is the primary raw material for the production of phthalate esters such as dibutyl phthalate (DBP) and dioctyl phthalate (DOP), which are widely used as plasticizers in PVC and other polymers.

2.Resins: Used in the manufacture of unsaturated polyester resins and as a curing agent for epoxy resins.

3.Dyes and Pigments: Employed in the production of dyes and pigments, including anthraquinone-based dyes and phthalocyanine blue pigments.

4.Food Additives: A precursor for the production of food additives like sugar substitutes.

5.Pharmaceuticals: Utilized in the synthesis of pharmaceutical intermediates and active ingredients, such as laxatives.

6.Agricultural Chemicals: Involved in the production of pesticides and herbicides.

7.Other Applications: Also used in the production of rubber processing aids, coatings, adhesives, and various specialty chemicals.