Spent-caustic treating technology converts waste into saleable byproduct

The Pretreat unit was installed with Copesul's second cracker in 1999 (Fig. 1).Click here to enlarge imageThe first commercial Pretreat unit (Fig. 1), started in July 1999, was built as part of the second ethylene unit project of Companhia Petroquimica do Sul (Copesul), in Triunfo, Brazil. This Pretreat unit was installed upstream of a Stone & Webster Inc. (S&W)-BP spent-caustic wet air oxidation (WAO) unit and S&W ozonation unit.Copesul sold the treated spent caustic from the Pretreat unit, which met the stringent specifications of pulp and paper manufacturers, to a local pulp and paper mill. The WAO and ozonation units essentially function on standby.The technology was developed b...

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