模拟轻质油品的氧化脱硫

A simulated light oil consisting of model sulfur compounds of benzothiophene (BT), dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) and n-heptane as solvent was employed for the oxidative desulfurization tests in hydrogen peroxide and formic acid oxidative system. The effects of amount of agent, reaction temperature and reaction time as well as the addition of naphthalene, tetraline, cyclodexene, indole on the sulfur removal were investigated in more details. The results showed that under the condition of reaction temperature of 60 ℃, ratio of hydrogen peroxide to sulfur of 7∶1(mol/mol), ratio of hydrogen peroxide to formic acid of 1∶1(v/v), and reaction time of 40 min, the desulfurization yields of 4,6-dimethyldibenzothiophene, dibenzothiophene and benzothiophene were 100%, 96% and 58%, respectively. The addition of naphthalene and tetralin made the desulfurization yields of benzothiophene decrease, while it made a little increase for the dibenzothiophene desulfurization yield. Both the addition of cyclodexene and indole decreased the removal of benzothiophene and dibenzothiophene, in which desulfurization yield of benzothiophene decreased faster than that of dibenzothiophene.