一种低共熔溶剂在深度萃取模拟油脱硫中的应用

Deep Extractive Desulfrization from Model Oil by New Tape of DESs

摘要:

以咪唑及其衍生物和Bu4NBr为原料，按一定的原料配比通过低温共熔共熔一系列新型低共熔溶剂（DESs），用于萃取脱除模拟油品中的二苯并噻吩（DBT），经实验测定当Bu4NBr与咪唑的物质的量之比X=0.6时，该类DESs对二苯并噻吩表现出最佳萃取效果，并针对DESs考察了剂油体积比与反应温度对脱硫效果的影响，测定了DESs的选择性能与重复使用性能。结果表明：在剂油体积比为1:6，萃取温度T=20℃，萃取时间t=30min的条件下，咪唑与Bu4NBr共熔物（DES I）对二苯并噻吩的脱硫率达到89.2%,四次萃取后，其脱硫率达到95.0%;同一条件下该类DESs对于不同噻吩类衍生物的脱除能力的顺序为：二苯并噻吩（DBT）>苯并噻吩（BT）＞4,6-二甲基二苯并噻吩（4，6-DMDBT）＞噻吩（T）；对DESs进行再生，再生后脱硫效果良好；经7次重复萃取过程后，DESs对DBT仍具有较高脱硫率。

Abstract:

A series of novel DESs were synthesized by low temperature eutectic by imidazole and its derivatives and Bu4NBr.The dibenzothiophenes in the simulated oil were extracted. The experimental results show that when the molar ratio of Bu4NBr and imidazole was 0.6,the DES showed the best extraction effect on the dibenzothiophene, and the effect of the ratio of the oil volume and the temperature on the desulfurization effect was investigated. The selectivity and recycling performance of DESs were also investigated. The results showed that the desulfurization rate of DBT was 89.2% under the conditions of 1: 6, the extraction temperature T= 20 ℃，and the desulfurization rate can be up to 95% after 4 times extractions. Under the same conditions, the order of removal ability of different thiophene derivatives is：DBT> BT> 4,6-DMDBT＞T. DESs were regenerated and the desulfurization effect was good after regeneration. DESs still had higher desulfurization rate for DBT after 7 times of repeated extraction.