超声辅助-过氧化氢/甲酸/磷钨酸催化氧化柴油深度脱硫研究

Study on diesel deep desulfurization by ultrasound assisted-H₂O₂/formic acid/phosphotungstic acid catalytic oxidation

摘要: 在超声辅助下，以过氧化氢/甲酸为氧化剂、磷钨酸为催化剂，用催化氧化的方法对加氢柴油深度脱硫，考察了磷钨酸用量、氧硫摩尔比、甲酸质量分数、油水体积比、反应温度、超声功率、萃取剂组成对加氢柴油脱硫效果的影响。实验结果表明，在磷钨酸用量为0.2%w_柴油、氧硫摩尔比为10:1、甲酸质量分数为80%、油水体积比为8:1、反应温度为80 ℃、超声功率为240 W、萃取剂组成为V_甲醇:V_水=2:1的工艺条件下，加氢柴油脱硫率和收率分别为97.3%和95.6%，总硫质量分数降至9.512 μg/g，达到加氢柴油深度脱硫的目的。

Abstract: Deep desulfurization of hydrofining diesel was treated by the process of ultrasound assisted-H₂O₂/formic acid-phosphotungstic acid catalytic oxidation. The factors affecting the treatment were studied. The experimental results showed that under the conditions of phosphotungstic acid dosage was 0.2% of the diesel mass fraction, molar ratio of O to S was 10:1, formic acid mass fraction was 80%, the volume ratio of diesel to water was 8:1, reaction temperature was 80 ℃, ultrasonic power was 240 W, the volume ratio of extractant methanol to water was 2:1, the removal rate of sulfur was 97.3% and the yield was 95.6% respectively, the total sulfur mass fraction decreased to 9.512 μg/g, which could meet the requirement of deep desulfurization of hydrofining diesel.