气相色谱-原子发射光谱联用技术测定柴油中硫化物

采用气相色谱－原子发射光谱（GC－AED）联用技术对柴油中硫化物进行了定性定量研究，考察了柴油加氢脱硫处理前后硫化物的变化及不同柴油原料硫化物的分布情况。结果表明，1＃柴油可定性出33类硫化物，经加氢脱硫处理后，1－1＃和1－2＃样品硫含量可由1497mg/L分别降到165.1mg/L和90.4mg/L，平均脱除率为89.0%和94.0%。其中噻吩或苯并噻吩的脱除率为100％；C1二苯并噻吩的肿除率为90.0%和96.2%;C2二苯并噻吩的脱除率为80.6%和91.7%；C3二苯并噻吩的脱除率为72.6%和84.4%；C4二苯并噻吩的脱除率为79.0%和90.3%;C5或C6二苯并噻吩的脱除率为58.4%和68.4%；未知硫化物脱除率95.7%和97.9%。噻吩类脱除率视取代基的大小、个数和取代位置的不同脱除率不同；不同原料 总硫和各种硫化物含量差别很大，应根据其硫化物的分布特点，有针对性地研制开发加氢脱硫的催化剂及选择合适的加工工艺。

STUDY OF SLUFUR COMPOUNDS IN DIESEL OIL BY GC-ATOMIC EMISSION DETECTION

Capillary gas chromatography coupled with an atomic emission detector (GC/AED) was used for the qualitative and quantitative analyses of sulfur compounds in diesel,and the sulfur-containing compounds distribution in different diesels before and after hydrodesulfurization (HDS) was investigated. 33 sulfur compounds in diesel No.1 were identified. The results showed that the sulfur content of hydrodesulfurized sample decreased from 1?497?mg/L to 90.4?mg/L with 94.0% of average sulfur removal efficiency. For thiophene or benzothiophene, C 1-dibenzothiophene, C 2-dibenzothiophene, C 3-dibenzothiophene, C 4-dibenzothiophene, C 5 or C 6-dibenzothiophene and unknown sulfur compounds, the sulfur removal efficiency were 100%, 96.2%, 91.7%, 84.4%, 90.3%, 68.4% and 97.9% respectively. The removal efficiency of thiophenes depends on substitution group and its magnitude and position. A deep understanding of sulfur compounds present in diesels is useful to elucidate the reaction mechanism under deep hydrodesulfurizing conditions and to optimize the process parameters of HDS.