加氢蜡油的催化裂化试验研究

Test evaluation research of catalytic cracking on wax oil before and after hydrogenation

采用中国石油独山子石化分公司FCCU的蜡油及在用平衡催化剂,在提升管试验装置上考察了反应温度、剂油比对产品分布的影响,根据汽油、柴油收率情况,确定适宜生产汽油试验方案为反应温度490℃,剂油比7.0;柴油方案为反应温度460℃,剂油比5.0。在此条件下,对加氢蜡油、未加氢蜡油进行相同工况下的催化裂化试验考察,原料经过加氢后整体转化率提高约10百分点,汽油收率增加3~5百分点,液化石油气增加5~7百分点,柴油收率降低6~8百分点,重油收率降低1~3百分点,有利于降低柴汽比;产品性质方面,汽油、柴油硫含量降低明显,达到90%以上,汽油烯烃含量降低8~14百分点,异构烷烃含量增加约6百分点,芳烃含量增加1~4百分点,组成变化明显。

The impact of reaction temperature and catalyst to oil ratio on the product distribution was investigated in a riser FCC unit with the wax oil and catalysts in Dushanzi Petrochemical Co.,Ltd.. Based upon the results of gasoline and diesel yields,appropriate gasoline production scheme is determined to be： reaction temperature： 490 ℃ and oil to catalyst ratio： 7. 0. In the diesel production scheme： the reaction temperature is 460 ℃ and oil to catalyst ratio is 5. 0. Under these conditions,the hydrotreated wax oil and un-hydrotreated wax oil are tested and studied. For the hydrotreated feedstock,the product yield was increased by about 10%,the gasoline yield is elevated by 3% - 5%,LPG yield is increased by 5% - 7%,diesel yield is lowered by6% - 8%,and heavy oil yield is reduced by 1% - 3%. In product quality,the sulfur in gasoline and diesel is obviously reduced by over 90%,the olefin in gasoline is lowered by 8% - 14%,the iso-alkane is increased to over about 6%,the aromatics is increased by 1% - 4%,and composition change is obvious.