最大化生产对二甲苯的炼油总工艺流程研究

Study on refining configuration for maximizing PX production

以规划新建加工15.0 Mt/a沙特轻质和沙特中质混合原油的大型炼油厂为例,按照分子炼油和环状碳链理论,对最大化生产对二甲苯的炼油总工艺流程进行了研究.结果表明,项目的对二甲苯产量可以达到5.0 Mt/a、副产苯1.62 Mt/a.重整原料主要来自：2.28 Mt/a直馏重石脑油（馏程65～ 175℃）、0.96 Mt/a催化裂化重汽油、2.47 Mt/a的柴油（含重芳烃循环）加氢裂化所产的重石脑油和减压蜡油加氢裂化的2.57 Mt/a重石脑油.剩余的芳烃产品来自C4/C5/C6轻烃,芳构化可产1.52 Mt/a富含芳烃的生成油,催化干气稀乙烯可直接生产0.12 Mt/a乙苯.

The refining configuration for maximizing PX is studied based upon the molecular refining and cyclic-carbon theory through a case study of a large grass-roots refinery with a capacity of 15.0 MM TPY of blended Saudi Arab light and medium crude. The results show that the PX maximum production will be about 5.0 MM TPY with 1.62 MM TPY benzene by-product. The reformer feed mainly comes from 2.28 MM TPY straight-run heavy naphtha of 65 - 175 ~C distillation range, 0.96 MM TPY FCC heavy naphtha, 2.47 MM TPY heavy naphtha （including heavy aromatics recycle） from diesel and heavy aromatics hydrocracking and 2.57 MM TPY heavy naphtha of VGO hydrocracking. The remaining aromatics product comes from 1.52 MM TPY product with rich aromatics content by C4/C5/C6 light hydrocarbon aromatization and 0.12 MM TPY eth- ylbenzene product from FCC offgas thin ethylene reaction.