Producing more high quality ethylene cracking feedstock by hydrogenation modification of straight-run diesel
Straight-run diesel was modified by mild hydrocracking process.The effect of different process conditions on the conversion rate of straight-run diesel and the properties of hydrocracking prod-ucts was investigated.The results showed that under the conditions of reaction pressure of 7.0 MPa and volume space velocity of 2.0 h-1,the conversion rate of straight-run diesel oil increased from 16%to 50%with the increasing of reaction temperature from 340℃to 350℃.With the increasing of con-version rate,the aromatics index of total distillate diesel decreased and the mass fraction of paraffin in-creased.Under the condition of reaction temperature of 345℃,the paraffin mass fraction of naphtha from initial distillation point to 91.0℃was 78%,and the ethylene yield was 29.2%and the triene(ethylene,propylene,butadiene)yield was 62.0%as ethylene cracking raw material.When the paraffin mass frac-tion of narrow fraction of diesel oil from 234℃to fi-nal distillation point was more than 60%,the ethy-lene yield was 31.9%and the triene yield was 64.6%as ethylene cracking raw material.
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