柴油在超声波/Cu^(2+)/H_2O_2中的氧化脱硫

Ultrasound oxidative desulfurization of diesel oil with copper ion and hydrogen peroxide

为了实现生产低硫柴油和超低硫柴油的目标,以超声波为外加能源,构筑超声波/类Fenton试剂的柴油氧化脱硫反应体系,考察了水相pH值和超声功率这两个参数对柴油氧化脱硫效果的影响。实验结果表明,当类Fenton试剂的水相pH值为2.00左右时,其脱硫效果较好;无超声波下H2O2、类Fenton试剂、超声波/H2O2及超声波/类Fenton试剂的柴油氧化脱硫反应符合表观一级反应动力学规律。超声波功率的提高对氧化脱硫有明显的促进作用,这主要是由于功率的增加,有助于加速空穴的形成与内爆,从而促进反应的进行。

The oxidative desulfurization （ODS） of diesel oil in the presence of copper ion and hydrogen peroxide was investigated with ultrasonic irradiation as an extra energy. The effects of operation parameters such as the aqueous phase pH and ultrasonic power on the desulfurization efficiency were examined and the ODS mechanism under ultrasonic irradiation was suggested. The results showed that the sulfur removal rate increases at first, and then decreases with an increase in the aqueous phase pH; the highest sulfur removal rate is obtained at about pH = 2.00. ODS is in conformity with apparent-first order kinetics for any of the four cases ： with hydrogen peroxide-acetic acid （ without ultrasound）, Fenton-type reagent （ without ultrasound）, combination of ultrasound and hydrogen peroxide, and combination of ultrasound and Fenton-type reagent. Moreover, the sulfur removal rate increases with the ultrasonic power, because the production of cavitation bubbles in the liquid and the collapse of the bubbles are enhanced by the ultrasonic power.