Spent caustic pretreatment and enhanced oxidation process

Details Spent caustic pretreatment and enhanced oxidation process Spent caustic pretreatment and enhanced oxidation process

B - Operations, Transporting

01

D

B01D 3/40 (2006.01) B01D 11/04 (2006.01) B01D 53/96 (2006.01) C10G 19/08 (2006.01)

Patent

CA 2321300

A process for pre-treating a spent caustic stream prior to oxidation which 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 and steam distilling the spent caustic raffinate to remove the residual organic solutes, yielding a pretreated spent caustic stream substantially free of organic material which is then subjected to wet air oxidation and thereafter to ozonolysis to yield a wastewater stream having a low COD and BOD, which is neutralized to a pH of 8.5 to 9Ø

La présente invention concerne un procédé permettant le prétraitement d'un courant de caustique épuisé préalablement à l'oxydation. On procède à l'extraction par solvant à contre-courant en plusieurs temps à température élevée. En l'occurrence, pour séparer du caustique épuisé la matière organique, on utilise un solvant permettant de donner un raffinat de caustique épuisé ne contenant que des quantités résiduelles de soluté organique. On réalise ensuite une distillation à la vapeur du raffinat de caustique épuisé, ce qui donne un courant de caustique épuisé prétraité sensiblement exempt de matière organique. On soumet alors ce courant à une oxydation à l'air humide puis à une ozonolyse donnant un courant d'eaux usées à faible demande d'oxygène biologique ou chimique, et que l'on neutralise jusqu'à un pH de 8,5 à 9,0.

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