The results of commercial application of two types of C_8 aromatics isomerization catalysts under different feed conditions were compared to gain an insight in the techno-economical basis for selecting proper technolo...The results of commercial application of two types of C_8 aromatics isomerization catalysts under different feed conditions were compared to gain an insight in the techno-economical basis for selecting proper technological route at the plant.The comparison reveals differences in every aspect of feed consumption,unit capacity,product output,product distribution,and unit process parameters depending upon which catalyst type is adopted by the integrated PX complex.The type of aromatics isomerization catalyst has its influence on the plant scale,the construction cost,the process unit capacity and the product cost,with the magnitude of its impact varying with changing feed conditions.展开更多
Reactor models were developed to describe the isomerization reaction process of C_(8) aromatics by applying a six-component sequential reaction network.Lab-scale experimental data were used in an axial bed reactor mod...Reactor models were developed to describe the isomerization reaction process of C_(8) aromatics by applying a six-component sequential reaction network.Lab-scale experimental data were used in an axial bed reactor model,and dynamic parameters were fitted by simulated annealing algorithm.In addition,industrial data and calculated dynamic parameters were used to determine the six-component concentration distributions using a radial reactor model.The influence of back-mixing on reaction performance was investigated.It was found that the model considering back-mixing was much closer to the real industrial reaction process.展开更多
After comparing the operating status of other catalytic reforming units and evaluation of the side-cut stream tests, the refinery investigated the influence of the feedstock property, clay types, and operating regime ...After comparing the operating status of other catalytic reforming units and evaluation of the side-cut stream tests, the refinery investigated the influence of the feedstock property, clay types, and operating regime of the clay tower and catalytic reforming unit on the service life of the clay. Test results had revealed that the low potential aromatic content of the reformer feed and high operating severity were the critical causes leading to high bromine number of the C8^＋ aromatics feed for the PX unit and the shortened service life of clay. This article also puts forward the corresponding remedial measures.展开更多
文摘The results of commercial application of two types of C_8 aromatics isomerization catalysts under different feed conditions were compared to gain an insight in the techno-economical basis for selecting proper technological route at the plant.The comparison reveals differences in every aspect of feed consumption,unit capacity,product output,product distribution,and unit process parameters depending upon which catalyst type is adopted by the integrated PX complex.The type of aromatics isomerization catalyst has its influence on the plant scale,the construction cost,the process unit capacity and the product cost,with the magnitude of its impact varying with changing feed conditions.
文摘Reactor models were developed to describe the isomerization reaction process of C_(8) aromatics by applying a six-component sequential reaction network.Lab-scale experimental data were used in an axial bed reactor model,and dynamic parameters were fitted by simulated annealing algorithm.In addition,industrial data and calculated dynamic parameters were used to determine the six-component concentration distributions using a radial reactor model.The influence of back-mixing on reaction performance was investigated.It was found that the model considering back-mixing was much closer to the real industrial reaction process.
文摘After comparing the operating status of other catalytic reforming units and evaluation of the side-cut stream tests, the refinery investigated the influence of the feedstock property, clay types, and operating regime of the clay tower and catalytic reforming unit on the service life of the clay. Test results had revealed that the low potential aromatic content of the reformer feed and high operating severity were the critical causes leading to high bromine number of the C8^＋ aromatics feed for the PX unit and the shortened service life of clay. This article also puts forward the corresponding remedial measures.
