模拟轻质油品的氧化脱硫

OXIDATIVE DESULFURIZATION OF SIMULATED LIGHT OIL

以正庚烷为溶剂,苯并噻吩(BT)、二苯并噻吩(DBT)、4,6 二甲基二苯并噻吩(4,6 DMDBT)作为模型含硫化合物组成模拟轻质油品,在H2O2 HCOOH氧化体系中对模拟轻质油品氧化脱硫进行了研究。考察了氧化剂用量、氧化温度、氧化时间及芳烃、烯烃、含氮化合物的存在等因素对BT、DBT脱除的影响。实验结果表明:在反应温度60℃,H2O2∶S=7∶1(mol mol),H2O2∶HCOOH=1∶1(v v),反应时间在40min的条件下,4,6 DMDBT能全部脱除,DBT、BT的脱除率分别为96%、58%。向油品中添加芳烃、烯烃、含氮化合物等对BT、DBT的脱除均有不同程度的影响。

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 40min, 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.