利用休止细胞法选择性脱除燃料油中有机硫

红球菌(Rhodococcus sp .)FS-1菌株能通过专一性断裂C—S键的途径脱除二苯并噻吩 (DBT)中的有机硫作为自身生长需要的硫源 ,从而降低油品中的硫含量 .本文利用该菌的休止细胞对DBT和柴油的脱硫活力进行了研究 .结果表明 ,该菌株对DBT及柴油中的有机硫均有良好的选择性脱除作用 .DBT浓度为0.5～1.0mmol/L、油水比例为 1:5时 ,脱硫效果最佳 .采用二次脱硫法可使柴油脱硫率达85%以上 ,证明FS-1能有效脱除柴油中的有机硫 .烃质组分的气相色谱分析表明 ,FS-1作用前后的柴油烃类组分基本没有改变 ,说明该菌的脱硫作用是特异性针对硫原子的 ,不会破坏柴油的有效成分 .

Selectively Desulfurizing Organic Sulfur of Diesel Oil by Resting Cells

Rhodococcus sp. FS-1 ,which can specially break the Csingle bond]S bond of dibenzothiophene (DBT) and convert DBT into 2-hydrobenzophene by "4S" pathway, is used to decrease the sulfur content in diesel oil. This research focuses on the diesel oil desulfurization using resting cells of Rhodococcus sp. FS-1. The research result indicate that the desulfurization activity of the resting cells of Rhodococcus sp. FS-1 was strongly high. When the concentration of DBT was 0.5 - 1.0mmol/L and the ratio of oil/water was 1:5, the effect of desulfurization was highest. The desulfurization rate was over 85 % when desulfurizing the diesel oil twice. GC analysis proves that this process did not break the carbon-carbon backbone. The calorific value of diesel oil is reserved.