掺炼苯酚焦油对减压渣油焦化性能的影响

Impact of blending phenol tar on coking performance of vacuum residue

采用常规工业焦化条件,在中型延迟焦化试验装置上考察了减压渣油掺炼5%(质量分数,下同)苯酚焦油后焦化产品分布及产品性质变化情况,结果表明:减压渣油中掺炼5%苯酚焦油,可抑制减压渣油在热转化过程中最终生焦总量,但焦化原料结焦起始温度降低,焦化汽油、总液体收率分别提高了4.85,5.86百分点,焦炭产率则降低了5.00百分点,产品分布有所改善;焦化汽油馏分中硫、氮质量分数分别降低至0.41%,43.20μg/g,RON提高了28单位;焦化柴油馏分中硫、氮质量分数分别降低了0.12,0.02百分点,十六烷值降低了11单位;焦化产品除焦化柴油十六烷值损失较大外,其他性质均有所改善。实际工业操作中,可考虑将焦化柴油的初馏点后移,以使其中的单环芳烃进入到汽油馏分中,进一步提高汽油辛烷值的同时可改善焦化柴油的十六烷值。

Under normal commercial delayed coking conditions, the vacuum residue （VR） was processed in a delayed coking pilot plant by blending m5% phenol tar to investigate the coking performance of vacuum residue, product distribution and product property variations. The results showed that when VR was blended with 5.00 percent of phenol tar, the final coke make in the process of thermal conversion of VR could be re- duced. Whereas, the initial coking temperature was reduced, the coker gasoline yield and total liquid yield were increased by 4.85% and 6.64% respectively, the coke yield was lowered by 5% , and product distribu- tion was improved. The sulfur content of gasoline was reduced to 0.41% , the nitrogen content was lowered to 43.20 I^g/g and the gasoline octane was raised by 28 units. The sulfur in gas oil was reduced by 0.12% , the nitrogen content was lowered by 0.02% and cetane number was reduced by 11 units. The properties of all de- layed coker products have been improved except the cetane number of coker gas oil. In operation, the initial boiling point of coker gas oil can be moved backward to allow the single-ring aromatics going into the gasoline fraction. This will not only raise the octane number of gasoline but also improve the cetane number of cokerg as oil.