Spent caustic (pre)treatment process

Details Spent caustic (pre)treatment process Spent caustic (pre)treatment process

1997-02-26

1999-03-23

Manoharan, Virginia

Distillation: processes, separatory

With disparate physical separation

Utilizing liquid-liquid extracting of distillation product

203 46, 203 75, 203 76, 203 78, 203 79, 208317, 208321, 208337, 208356, 208363, 423183, 423641, B01D 338, B01D 1104

Patent

active

058854223

ABSTRACT:
A process for pretreating a spent caustic stream prior to oxidation includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate containing only residual amounts of organic solute. The raffinate is steam distilled to remove the residual organic solutes, yielding a pretreated spent caustic stream substantially free of organic material. The pretreated spent caustic is suitable for use in a Kraft paper process or for oxidation prior to recycle or disposal. Solvent extract from the extractor is regenerated in a solvent regenerator having an overhead stream for purging light ends, a bottom stream for purging heavy ends, and a heart-cut side stream for recycling solvent to the extractor. Alternatively, solvent may be taken as a cut from an existing plant process stream, once passed through the multi-stage solvent extraction unit, and then returned to the processing unit of the plant from which it was taken.

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