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A dibenzothiophene (DBT)-desulfurizing bacteria strain was isolated from oil-contaminated soils and identified as Rhodococcus erythropolis NCC-1. Strain NCC-1 was found to convert DBT to hydroxybiphenyl (2-HBP) via the 4S pathway and also be able to use organic sulfur compounds other than DBT as a sole sulfur source. The strain could desulfurize 4,6-dimethyldibenzothiophene (4,6-DMDBT), which is one of the most recalcitrant dibenzothiophene derivatives to hydrodesulfurization. When two type of oils, a model oil [n-hexadecane (n-C16) containing DBT] and a hydrodesulfurized diesel oil with various organic sulfur compounds, were treated with Rhodococcus erythropolis NCC-1 cells, the total sulfur content significantly decreased, from 150 to 20 mg/L for n-C16 and from 554 to 274 mg/L for diesel oil. The newly isolated strain NCC-1 is considered to have good potential for application in the biodesulfurization of fossil fuels. 相似文献
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首次超声条件下使用Ce4 氧化柴油中的硫化物(主要为苯并噻吩类),并把这类硫化物氧化成砜类化合物,再选用合适的溶剂(DMF)将这些砜类化合物通过萃取方法除去,使柴油中的总硫含量从554mg/L降到25mg/L,达到了95.5%的高脱硫率。处理后的柴油总硫含量符合世界燃料规范Ⅲ柴油质量标准(不大于30mg/L)。同时,Ce4 氧化媒质可以通过电化学方法再生循环利用,DMF也可以循环利用,无三废排放、具有最佳的经济效益比,并且这种脱硫方法符合绿色化学发展的要求。最佳的操作条件:反应温度为70℃,溶液的pH=0.69,反应时间为50min;V(油):V(水)=1:9。Ce4 氧化媒质的再生条件:Pb电极为阳极,石墨电极为阴极,反应中需要的槽压为3.1V,再生后Ce4 氧化媒质仍具有很好的脱硫效果。 相似文献
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红串红球菌通过4S途径降解二苯并噻吩(DBT)产生 和2-羟基联苯(2-HBP). 和2-HBP的存在对红串红球菌的进一步脱硫有抑制作用, 加入脱 和2-HBP 的菌株可以解除 和2-HBP对红串红球菌脱硫反应的抑制, 使该反应继续向生成产物的方向移动, 从而提高其脱硫率. 在脱硫菌和专一性降解 的水解好氧菌(代号: PYS)的协同作用下可以使高浓度的DBT从1.142 mmol/L降到0.0468 mmol/L, 降解率达到95.9%, 比没有加PYS时提高32%的脱除率. 在油水比为1∶9的条件下, 可以将柴油中的硫从554 mg/mL降到306 mg/mL, 降解率达到44.8%. 相似文献
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