Reutilization Plant for Organohalogen Compounds

Since the by-products are often not directly reutilizable, they are disposed of in a waste incineration plant. Up to now only a recovery of the energy content is possible a chemical reutilization of the by-products is not. Purification of the flue gas does not lead to reutilizable sustances. 

The objective was not only to utilize the calorific values of these by-products or residues but also to reuse them chemically. This was achieved by thermal oxidation (incineration) with simultaneous neutralization to give potassium halides that are subsequently dissolved in water. The salt solution obtained is used for the recovery of potassium bromide, potassium fluoride, and potassium chloride as raw materials. 

Waste air firom the production of halogenated aromatics is used to form part of the combustion air, so that the residues present in the waste air (e.g., fluorine compounds) can also be treated in the recovery process. 

The residues are converted to hydrogen halides in the oxidation chamber at 1200 C and a residence time of at least 2 s. The hydrogen halides are then immediately neutralized by the simultaneous spraying of potassium hydroxide solution into the 

The liquid level in the quenching vessel is kept constant by adding hquor from the waste-gas scrubbers. Thereby some evaporation of the salt solution occurs. 

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