文档编号:SW207 文档字数:24911,页数:63 摘要:本文档采用GC和GC-MS等分析技术,对新分离的专一性脱硫菌分枝杆菌(Mycobacterium sp.)ZD-19降解有机硫化合物二苯并噻吩(Dibenzothiophene,DBT)的代谢途径进行了研究。实验得出ZD-19降解DBT的代谢终产物为2-甲氧基联苯(2-Methoxybiphenyl, 2-MBP),可能是由中间产物2-羟基联苯(2-Hydroxybiphenyl, 2-HBP)苯环上连接的羟基甲氧基化得到的,此途径区别于传统的4S途径。同时考察了表面活性剂对ZD-19脱硫活性的影响。实验显示表面活性剂的加入可以显著提高ZD-19的生物脱硫性能,其中以大豆卵磷脂(Soya Lecithin, SL)的效果最明显,极大的促进了休止细胞的脱硫活性。实验结果表明当SL加入量为0.2 g/L 时,其对微生物脱硫的促进作用最大。 关键词:生物脱硫;二苯并噻吩;4S途径;表面活性剂 Abstract: This paper reports GC and GC-MS analyses of the Dibenzothiophene (DBT) -desulfurization pathway of new isolated strain Mycobacterium sp. ZD-19. The experiment showed that the ZD-19 could methoxylate 2-Hydroxybiphenyl(2-HBP) to 2-Methoxybiphenyl(2-MBP) in DBT degradation. It distinguishes that strain ZD-19 have the ability of conversion the hydroxy forms which is the end product via the traditional 4S pathway to methoxy forms. Simultaneously research the effect of the surfactant to the ZD-19 desulphurization activity. The experimental results revealed surfactants could strongly enhance the solubility of DBT in water and improve the mass transfer of DBT between organic and aqueous phases.The experimental results show that the stimulative effect of Soya Lecithin(SL) is most obvious, especially when SL was added at 0.2 g/L in organic and aqueous (o/l) desulfurization reaction system.
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Tags:脱硫 模拟 油品 特性 研究 | 2011-04-05 15:00:53【返回顶部】 |