超声波作用下柴油氧化脱硫工艺研究

Research on Deep Oxidative Desulfurization of Diesel via Ultrasonic

对超声作用下柴油氧化脱硫进行了研究,采用H2O2作为此工艺的氧化剂。通过对不同浓度的H2O2对河南南阳催化裂化柴油脱硫效果考察发现,30%浓度的H2O2的脱硫率最高。同时无机酸催化剂的脱硫效果表明,硫酸和磷酸按1∶1比例混合效果最好。再加入金属催化剂后脱硫率更高。实验结果表明了,功率超声作用下,H2O2-硫酸与磷酸1/1混合酸体系的最优操作条件:氧化体系:油(体积比)=3∶10;H2O2:混合酸(体积比)=1∶1;超声作用时间9m in。萃取剂:DMF;萃取剂∶油(体积比)=1∶1;萃取一次。硫含量从1936.48μg/g降到99.73μg/g,脱硫率94.8%,油收率90.2%。可见功率超声强化了整个氧化脱硫过程。此外,在相同的氧化和萃取条件下,柴油在低频28kHz时的脱硫效果比40kHz的脱硫效果好;同时在功率超声的功率为200W时脱硫率最大。

Oxidation desulfurization of diesel was studied via ultrasonic. H2O2 was used as oxidant. The result of desulfurization of diesel using H2O2 of various concentrations showed that the desulfurization rate was the highest with 30% H2O2. And the effect of inorganic acid catalysis indicated that the excellent desulfurization rate appeared when the mix ratio of sulfuric acid to phosphoric acid was 1 ： 1. And the desulfurization rate would be much higher if metal catalyst was added. The experimental results indicated that with ultrasonic irradiation, the optimal operating conditions of H2O2 - mixed acid system （ sulfuric acid ： phosphoric acid = 1 ： 1 ） was as follows： oxidant ： oil was 3：100 （ volume ratio） ; H2O2 ： mixed acid was 1 ： 1 （ volume ratio） ; reaction time was 9min; extraction solvent was DMF; extraction solvent ： oil was 1：1 （volume ratio） ; extracted for one time. The sulfur content decreased from 1936.48 μg/g to 99.73 μg/g, the desulfurization rate was 94.8%, and the oil recover rate was 90.2%. The ultrasonic intensified the oxidative desulfurization process. Furthermore, under the same oxidative and extraction conditions, the desulfurization result of low ultrasonic frequency （28 kHz） was better than higher ultrasonic frequency （40 kHz）. It was also discovered that the effect of desulfurization was excellent when the ultrasonic power is 200W.