QUENCH WATER PRETREAT PROCESS

摘要

A process for pretreating an oily/water stream for closed loop dilution steam production within an ethylene plant using countercurrent multi-stage extraction within extraction towers (8) to remove organic solutes from in-situ quench water with an organic solvent to yield an aqueous raffinate containing only residual amounts of organic solute. The raffinate is steam stripped in a water stripping unit (18) to remove the residual organic solutes, yielding a pretreated quench water stream substantially free of organic material. The pretreated quench water is suitable for reuse to generate dilution steam without fouling. The extract from extraction is regenerated in a solvent regenerator (14) having an overhead stream for purging lights, a bottom stream for purging heavies, and a heart-out side stream for recycling solvent to the extractor.