摘要
针对煤焦油特性,选择N,N-二甲基甲酰胺在优化工艺条件下对煤焦油进行萃取精制,在温度50℃,剂油比为1.5的优化条件下,得到20.8%的非芳烃油,38.7%的富芳烃油(小于360℃)和40.5%的软沥青。与直接对煤焦油进行蒸馏所得产品相比,经溶剂处理后蒸馏得到的小于360℃馏分油中芳烃更为富集。所得软沥青与直接蒸馏所得软沥青相比,甲苯不溶物和喹啉不溶物含量没有明显差别,但将两者在常压、420℃条件下热聚2.8h后,前者β树脂的含量有较大幅度提升,达到23.1%,软化点达到101.6℃,能够满足电极用沥青黏结剂质量要求。此外,所得非芳烃油主要由环烷烃类和链烷烃类结构构成,可作裂化原料。
The non-aromatic hydrocarbon （NAH）, fraction rich in aromatic（〈 360 ℃） and soft pitch were separated from coal tar by DMF extraction under optimal conditions ： 50 ℃, solvent/coal tar of 1.5, with yields of 20. 8% ,38.7% and 40.5% ,respectively. Compared with the components distilled directly from coal tar,aromatics content was more enriched in 〈360 ℃ fraction from solvent extraction. No sig- nificant difference in content of TI and QI of the refined soft pitch and the soft pitch distilled directly is found. However,after the pitches were thermally polymerized at 420 ℃ for 2.8 h at atmospheric pres- sure, the content of beta resin in refined soft pitch is greatly improved,reaching to 23.1% with a soften- ing point of 101.6 ℃ ,meeting the quality of binder pitch for electrodes. In addition,NAH is made up of naphthenes and paraffins,which can be used as a catalytic cracking feedstock.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2017年第3期58-62,共5页
Petroleum Processing and Petrochemicals
基金
辽宁石油化工大学科研启动基金(2016XJJ-017)
关键词
煤焦油
改质工艺
萃取
改质沥青
coal tar
upgrading process
extraction
upgraded pitch
