摘要
催化裂化柴油加氢后的剩余硫化物主要为二苯并噻吩、4-甲基二苯并噻吩和4,6-二甲基二苯并噻吩为代表的多环芳香硫化物。研究用H_2O_2/甲酸体系氧化加氢后的柴油,并用有机溶剂萃取,除去二苯并噻吩类的氧化产物。试验发现,溶剂N,N-二甲基甲酰胺(DMF)的萃取效果优于二甲亚砜、乙腈及甲醇。在50℃下氧化反应15min,氧化后用DMF以剂油比1:2萃取,柴油中硫质量分数可从665.5μg/g降至83.6μg/g,脱硫油收率94.0％,氧化剂可循环使用3次。氧化-萃取前后柴油的GC-FPD分析表明,柴油中二苯并噻吩(DBT)类完全脱除。柴油氧化产物的IR分析表明,DBT类硫化物的氧化产物为砜类。
Dibenzothiophene (DBT), 4-methyl-dibenzothiophene and 4, 6-dimethyl-dibenzo-thiophene are typical poly-aromatic sulfur-containing compounds in hydrogenated LCO. The oxidation of hydrogenated LCO was conducted with a mixture of hydrogen peroxide and formic acid and succeeded by solvent extraction to remove the oxidized organic sulfur compounds, which IR analysis indicated that they were sulfones. The extraction results showed that among the solvents, N, N-dimethylformamide (DMF) was better than dimethyl sulfoxide, ethyl cyanide and methanol. The oxidation was carried at 50℃ for 15 minutes succeeded by DMF extraction with a solvent to oil ratio of 1 : 2, and the desulfu-rized oil yield was 94 %. The GC-FPD analysis showed that the DBT type compounds in the final product were completely removed, and the sulfur content reduced to 83. 6μg/g from 665. 5μg/g before oxidation and extraction. Further more, the oxidizing agent could be circulated.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2003年第11期22-26,共5页
Petroleum Processing and Petrochemicals
