Examples of spent caustic analyses

I General chemical characteristics of six refineries Sulfidic spent caustic [Pg.133]

The corresponding COD is considerable. Refinery (6) processing 6 to 8 Mr/y discharges 1.5 to 2 tn h of spent caustic whose COD varies from 20 to 100 g rh [Pg.133]

Two common processes are stripping after acidification and oxidation. Oxidation can be performed in several steps generally confined to the state and less often reaching [Pg.133]

Theoretically, the first process requires reneutralising the acid effluent after it has been stripped and is more expensive in reagents. Meanwhile the second process is supposed to allow some recycling of the oxidized spent caustic which is still highly alkaline. [Pg.133]

In practice however, the first process requires less investment and also performs partial phenol removal from the phenolic spent caustic. As a result, it is being developed more than the second one. [Pg.134]

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