Organic sulfur removal from catalytic diesel oil by hydrodesulfurization combined with biodesulfurization

It is difficult to make the sulfur of dibenzothiophene(DBT) and C_x-DBT contact with hydrogenation catalyst because of the existence of steric hindrance.Therefore,as the main technological process of desulfurization of diesel oil,the ability of catalytic hydrogenation(HDS) to remove the main organic sulfur compounds in diesel oil such as DBT and C_x-DBT is relatively low.The study aimed at the treatment of catalytic diesel oil whose sulfur content was 3 358 μg/g by a process that combined HDS with biodesulfurization(BDS).The results showed that the sulfur content of catalytic diesel oil was less than 20 μg/g;further using gas chromatography with atomic emission detector(GC-AED) to detect the distribution of sulfur compounds in diesel oil before and after desulfurization,it indicated that the technology that combined HDS with BDS could remove most of DBT and C_x-DBT in catalytic diesel oil effectively and showed favorable applied foreground.