FCC模拟汽油中氧化-萃取耦合脱硫研究

Desulfurization of FCC simulated oil by coupling oxidation- extraction

以二苯并噻吩(DBT)溶于正辛烷配制成FCC模拟汽油(硫质量分数为800μg/g),以杂多酸季铵盐[C16H33N-(CH3)3]3PMo12O40为催化剂,H2O2为氧化剂,离子液体[BMIM]BF4为萃取溶剂,考察了催化氧化时间、H2O2用量、催化剂用量及反应温度对FCC模拟汽油氧化萃取耦合脱硫的影响,并探讨了氧化萃取耦合脱硫的反应机理。结果表明:当催化氧化时间t=120 min,反应温度T=60℃,n(催化剂)/n(S)=0.05,n(H2O2)/n(S)=4,萃取剂[BMIM]BF4体积V=1 m L时,FCC模拟汽油脱硫率可达95.1%。[C16H33N(CH3)3]3PMo12O40/H2O2/[BMIM]BF4体系具有较好的循环使用能力,循环使用5次后脱硫率没有明显下降。

The desulfurization of the simulated oil（ S content 800 ppm） consisting dibenzothiophene and n-octane is performed by oxidation-extraction coupling method with [ C16 H33 N （CH3 ）3 ] 3 PMo12O40 as catalyst, H2O2 as oxidant and [ BMIM ] BF4 as extraction solvent. The effects of the oxidation time, the oxidant and catalyst dosage, the temperature and the reaction mechanism on oxidation-extraction coupling desulfurization are investigated. The results show that the removal rates of DBT can reach 95.1% under the following conditions： 120 minutes of the oxidation time,60℃ of the temperature,0. 05 of n （catalyst）/n （ S）, 4 of n （ H2O2 ）/n （ S and 1 m L of [ BMIM ] BF4. The system [ C16 H33 N- （CH3） 3 ] 3 PMo12O40/H2O2/[ BMIM ] BF4 could be recycled for five times without the obvious decrease in activity.