| 摘要 |
<p>Method of treating residues from the distillation of phthalic anhydride, avoiding pollution of the atmosphere and the zones for the discharge of such residues, and permitting easy handling of said residues. The method comprises drawing off a certain amount of the bottoms from the distillation column, subjecting the product drawn off to a thin layer evaporation operation, and spraying water onto the stream of the heavy fraction which flows away after said evaporation operation, and then collecting the product in water which is thus cooled and granulated.</p> |
