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Basic Phthalic Anhydride

The Phthalic Anhydride (PA) is today produced from two main sources:

  • production from o-xylene
  • production from naphthalene

Both main technologies involve specific catalyst for selective oxidation of raw material to product.

The technology consists of 4 main phases:

  • recuperation of Phthalic Anhydride from reactor off-gases (performed in switch condensing section)
  • refining to commercial product (performed in distillation unit)
  • flaking and packing system

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Any of Phthalic Anhydride production technologies include sub sections as:

  • Steam system – energy recuperation
  • Waste gases incineration
  • Recovery of Maleic anhydride from off gases of switch condensers in quantity of about 4% calculated on PA (optionally)
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