Summary of practice for improving the selectivity of heavy naphtha in a large paraffin hydrocracking unit
The processing raw material for the 2#4.0 Mt·a-1 paraffin hydrocracking unit of Zhejiang Petrochemical Co.,Ltd.is straight run light paraffin oil from atmospheric and vacuum units.The main products include light naphtha,heavy naphtha,aviation kerosene,diesel oil and hydrogenated tail oil,among which heavy naphtha is the main raw material for the production of paraxylene(PX).In order to increase the production of heavy naphtha,this unit combines the actual production characteristics and deeply explores the production potential.The reaction conversion was increased from 75%to 89.8%,and the yield of heavy naphtha was increased from 23.99%to 33.14%.The substantial increase in heavy naphtha yield ensures the supply of raw materials in the continuous reforming unit,and then ensures the high yield and excellent yield of PX in the aromatics combined unit.At the same time,the yield changes of high value-added marine fuel oil and diesel products are relatively small,and the company's product structure has been significantly improved.
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