炼厂转型生产对二甲苯方案的经济性分析

Economic Analysis of Refinery Shifting to Produce Para-xylene

以某炼油企业转型生产对二甲苯的方案为例,分析如果把作为汽油调和组分的重整生成油转为生产对二甲苯原料,在工厂辛烷值严重不足的情况下,将降低全厂汽油池的辛烷值以及减少汽油产量,进而影响产品收益。通过补充混合二甲苯作为生产对二甲苯原料时,受混合二甲苯与对二甲苯价差影响,不同价格体系下收益不同。通过优化加工流程,利用现有重整装置富余能力,局部适应性改造提高装置处理能力,减少外购二甲苯量来降低原料成本,对提高项目收益有利。

Taking a case study of a refinery shifting to produce para-xylene as an example,this paper analysed the reduction of gasoline output and octane number,and the impact on refining margin after its reformate oil was used as p-xylene feedstock instead of gasoline blending component.When mixed xylene was added as p-xylene feedstock,the refining margin was affected by the price difference between the mixed xylene and the para-xylene in different pricing system.By optimizing the process and utilizing the surplus capacity of the reforming unit,coupled with partial adaptive modification,the amount of outsourced xylene has been reduced to cut the feedstock cost and thus to boost the modification project income.