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Synonyms -

1,3-Isobenzofuranidone; 1,3-Dioxophthalan; Phthalandione; 1,3 Phthalandione; 1,2-Benzenedicarboxylic acid anhydride; Phthalic acid anhydride; 1,2-Benzenedicarboxylic anhydride; 1,3-dihydro-1,3-dioxoisobenzofuran.

About the Product –

Phthalic anhydride, an organic compound, is the anhydride of phthalic acid. It is a white crystalline solid. It is an important industrial chemical and used for production of plasticizers for plastics. It I also used as an intermediate in organic chemistry. The most important reaction of Phthalic Anhydride is with alcohols or diols and which will produce esters or polyesters.

Identification Features -

CAS Number: 85-44-9 
H.S. Code: 2917.35

Chemical formula: C6H4(CO)2O

Chemical Properties: 
Melting point:  130-131°C
Boling point:  284°C
Specific gravity:  1.53

Solubility in water:  6gm/l

Vapour density: 5.1

Production Process –

Phthalic anhydride is produced by catalytic oxidation of ortho-xylene and naphthalene. The catalyst used for the oxidation of xylene is vanadium pentoxide (V2O5).

C6H4(CH3)2 + 3 O2 → C6H4(CO)2O + 3 H2O

C10H8 + 4.5 O2 → C6H4(CO)2O + 2 H2O + 2 CO2

Phthalic anhydride can also be produced from phthalic acid.

Uses

• Used to manufacture synthetic resins.
• Used to produce plastic from vinyl chloride.
• Used as a rubber scorch inhibitor and retarder.
• Used to manufacture dyes and pigments.
• Used in textile and leather industry.
• Used to manufacture paints and lacquers.

The Phthalic Anhydride market has been following mixed trend. Domestic prices floated in the range of Rs.85-90/Kg in the first quarter which reduced to the levels of Rs.60-65/Kg in the second quarter of 2017. The first quarter of 2017 saw an unprecedented increase which has now reduced to its lowest levels in the second quarter of 2017. Similar market sentiments were observed in Asian markets. The reason was limited supply coupled with tight supply of feedstock Ortho Xylene. The procurement of chemical majorly depends on the need basis as this chemical is not manufactured in India.