Research On Technologies Of Desulfurization Regeneration Of Spent Caustic Of Ethylene Cracking

With the spent caustic of ethylene cracking as researching subject, with the reuse of spent caustic as the study object, the essay makes a series of experimental research on desulfurization and regeneration of spent caustic.The main research content include:l.With CuO as desulfurizer, spent caustic is desulfured and regenerated. The essay observed the influence of the reacting temperature, reacting time, the applying amount of desulfurizer, the total alkali amount and its composition changes on desulphating effects.2.The essay carried out the experimental research on the repeated regeneration of spent caustic and desulfurizer.The conclusion through the above research is as follows:1.It’s available to conduct precipitating desulfurization for spent caustic of ethylene cracking with CuO as desulfurizer. There is no influence for the total amount of spent caustic and the composition changes on desulphating effects. The desulphating precipitation CuS can be repeatedly used for CuO through wet oxidizing regeneration. The purity of the regenerated CuO can meet the standard of reagent’s purity, and the desulfurized property doesn’t change.2.The evaluation result of the spent caustic of fhysical properties for regenerated spent caustic and the acid gas absorbency shows that, at the same total alkalinity, the absorption rate of new caustic and regentserated spent caustic is not much. That means it’s available for regenerated spent caustic to replace new caustic solution, from the view point of absorption rate of acid gas.It can achieve its resource-oriented utilization. The economic,environmental and social benefits is remarkable.