Process technology for Phthalic Anhydride
Improved plant design based on our own production experience.

Technobell technology used to produce phthalic anhydride (PAH) is based on the selective oxidation of o-xylene.

Petrochemical
A multi-purpose ingredient.
Phthalic anhydride is a white crystalline solid, an intermediate product for which the largest markets are the production of phthalate plasticizers, unsaturated polyester resins and alkyd resins for surface coatings. The majority of worldwide phthalic anhydrite consumption is in its molten form.
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Final product Quality
Unit Expected Guaranteed
Color in molten form Hazen 5 max. 10
Colour stability in molten form Hazen 30 max. 40
Melting point Celsius 131.5 min. 131.3
Purity in molten form % 99.9 min. 99.8
Color in molten form
Unit
Hazen
Expected
5
Guaranteed
max. 10
Colour stability in molten form
Unit
Hazen
Expected
30
Guaranteed
max. 40
Melting point
Unit
Celsius
Expected
131.5
Guaranteed
min. 131.3
Purity in molten form
Unit
%
Expected
99.9
Guaranteed
min. 99.8
*tested 1.5 hour at 150°C
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