MIP装置回炼轻汽油馏分增产丙烯的实施方案及效果

IMPLEMENTATION PLAN AND EFFECT OF INCREASING PROPYLENE PRODUCTION BY RECYCLING LIGHT GASOLINE DISTILLATE INTO MIP UNIT

为降低成品油产量、增产丙烯,可将高烯烃含量轻汽油馏分送回MIP装置进行回炼。轻汽油回炼方式有4种:轻汽油走单独增设的回炼提升管回炼,轻汽油走急冷油线进MIP反应器变径提升管回炼,轻汽油进MIP提升管预提升段底部回炼,轻汽油进单独增设的喷嘴(在重油喷嘴下方)回炼。经对比分析发现:在重油喷嘴下方单独增设轻汽油喷嘴回炼,可以调控反应时间和反应深度;在尽量多产丙烯的前提下,轻汽油回炼产物分布合理、对MIP产品性质负面影响小、装置经济效益好,是优选的轻汽油回炼方式。

In order to reduce the fuel oil yield and increase the propylene yield,light gasoline distillates with high olefin content can be sent back to MIP unit for reprocessing.There are four ways of light gasoline refining methods:light gasoline is refined in a separate riser,light gasoline is used as quench oil into MIP reactor,light gasoline is recycled to the bottom of pre-lifting zone of the riser,and light gasoline is refined in a separate refining nozzle(below the heavy oil nozzle).After comparison and analysis,it was found that the reaction time and depth could be adjusted by adding a new light gasoline recycling nozzle under the heavy oil nozzle,the product distribution of light gasoline reaction was reasonable,the negative impact on MIP product properties was small,and the economic benefit was good.