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Nicolas LEPEU : ATOFINA
INTRODUCTION
Phthalic anhydride is an important raw material in the manufacture of plasticizers (phthalates), polyester and alkyl resins, and pigments.
Phthalic anhydride can be manufactured in a variety of ways: in the liquid phase (ex-orthoxylene), on a fluidized bed (ex-naphthalene) and in the gas phase from both raw materials.
The "high-temperature" process (reaction catches at around 450 ˚C) used a boiling mercury bath to remove the heat released by the reaction. It no longer exists.
The "medium-temperature" process described below (reaction catches at around 330-370 ˚C) uses a molten salt bath as the heat transfer fluid. Yields are better than those of the "high-temperature" process, and the safety-environmental aspects are less delicate.
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Phthalic anhydride — Medium-temperature" process
Description of the "medium temperature" process
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