Recovery of amine from scrubbing water

When acid washing the cold-box exhaust gas, amine sulphate is formed (see Section 4.5.8.4). This amine may be recovered through neutralisation with sodium hydroxide, followed by distillation. 

If the amine is not recycled, the scrubbing concentrates can be treated in a biological waste water treatment plant with nitrogen elimination. 

If the operation is performed in a centralised plant, it involves transport of the scmbber liquid to 

This technique is applicable to all amine-containing scrubber liquors from core-making exhaust. The implementation is limited by economic factors (e.g. transport costs), since sufficient quantities of amine scrubber liquid need to be available. In general, the treatment is applied in a centralised location, treating the effluents of several foimdries. Since the operation is subject to an explosion hazard, any necessary measures to prevent explosion risks should be taken. 

Recovery of chemical compounds. Disposal costs for industrial waste. 

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