乙烯焦油生产汽油调合组分油的工艺研究

A Study into Using Ethylene Tar to Make Gasoline Blending Component

乙烯焦油是乙烯生产过程中的原料高温缩合产物,化学组分多,目前主要用作燃料油,经济价值较低,且燃烧时易产生结焦及黑烟,污染环境。乙烯焦油常压馏分(初馏点至210℃)直接作为汽油调合组分指标相差较大,利用乙烯焦油中初馏点至210℃常压馏分生产汽油调合组分的工艺方案,采用雅宝KF-757催化剂,考察加氢反应条件(反应温度、反应压力、空速、氢油比、催化剂稳定性)对常压馏分油性质的影响。通过对常压馏分油和加氢馏分油的性质比较,在温度355℃、压力6.0MPa、空速1.2h-1和氢油比450∶1的条件下,经加氢精制、蒸馏分离提纯后,基本满足车用汽油(V)指标要求,可以作为汽油的调合组分油。在整个实验过程中,催化剂一直保持较高的活性。后续中试放大研究中,将考察催化剂抗积炭能力、反应热效率、长期稳定性等,并补充反应物料平衡数据及公用工程损耗。

Ethylene tar is a product of pyrocondensation of feedstock in the process of producing ethylene,with many chemical components.The tar is currently primarily used as a low-value fuel oil,which usually produces coke and smoke when burned.When used directly as a gasoline blending component,atmospheric distillate of ethylene tar（initial boiling point up to 210 ℃） has greatly varied performance indices.Based on a process of making gasoline blending component with atmospheric distillate of ethylene tar,with the initial boiling point up to 210℃,which uses Albemarle KF-757 catalyst,technicians examined the influence of hydrogenation conditions（reaction temperature,reaction pressure,air speed,hydrogen-oil ratio and catalyst stability） on the properties of atmospheric distillates.By comparing the properties of atmospheric and hydrogenated distillates,they found that when the temperature stands at 355 ℃,pressure stands at 6.0MPa,air speed is1.2h-1and the hydrogen-oil ratio is 450 ∶1,after hydrotreating and distillation separation and purification,the blending component produced basically meets the specifications on national V auto-use gasoline products.Throughout the experiment,the catalyst maintained high activity.In a follow-up pilot-scale experiment,these technicians will test the catalyst′ s ability to resist carbon buildup,reaction heat efficiency and long-term stability and add data on reaction material balance and loss in public utilities.