Meng Xianglong, Zhou Pin, Li Lu, Liu Lizhong, Guo Mingming, Sun Tonghua
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai, 200240, China.
Sci Rep. 2020 Jun 26;10(1):10450. doi: 10.1038/s41598-020-67235-8.
The selectivity of a facile reductive and extractive desulfurization process was studied. In this desulfurization method, polyethylene glycol was used as the extractant, and sodium borohydride was used as the reductant. Several different simulated fuels were prepared by dissolving thiophenic sulfides, methylbenzene and hexylene in octane. The results showed that methylbenzene and olefins had different effects on different sulfur compounds during this desulfurization process. The extraction and reduction mechanisms were also explained. Four factors could affect the desulfurization performance: (1) intermolecular hydrogen bonding: (a) active O bonding with aromatic H or (b) S bonding with H atoms in hydroxide radicals, (2) "like-dissolves-like" interactions between polyethylene glycol and thiophenic sulfides, (3) the methyl steric hindrance effect and the electron density of sulfur atoms, and (4) the combination of S atoms with produced nickel boride to form active desulfurization centres. The desulfurization reaction path was also deduced according to the GC/MS results.
研究了一种简便的还原萃取脱硫工艺的选择性。在该脱硫方法中，聚乙二醇用作萃取剂，硼氢化钠用作还原剂。通过将噻吩硫化物、甲苯和己烯溶解在辛烷中制备了几种不同的模拟燃料。结果表明，在该脱硫过程中，甲苯和烯烃对不同的含硫化合物有不同的影响。还解释了萃取和还原机理。有四个因素会影响脱硫性能：（1）分子间氢键：（a）活性O与芳香H键合或（b）S与羟基自由基中的H原子键合；（2）聚乙二醇与噻吩硫化物之间的“相似相溶”相互作用；（3）甲基空间位阻效应和硫原子的电子密度；（4）S原子与生成的硼化镍结合形成活性脱硫中心。还根据GC/MS结果推导了脱硫反应路径。
