Optimization And Simulation Of The Extractive Distillation Process Of 100000 T/a Crude Benzol Hydro Refining

Benzene as a basic chemical raw material, widely used, which in the production of rubber, synthetic fibers, synthetic resins, pharmaceutical engineering and fuel applications, and many other fields, have played a crucial role. This suggests that benzene is in all aspects of life are used regularly. And it can be used in paints, rubber and other solvents. Therefore, it is no exaggeration to say that the level of industrialization of benzene may have been representative of the level of development of a country’s petrochemical. The main production process, including crude benzene hydrogenation refining, pretreatment, hydrogenation, dehydrogenation, crude benzene extractive distillation of raw materials and other four steps, the extractive distillation process is the main unit of production of crude benzene hydrogenation of benzene. The current simulation Aspen and other software applications, provides us with a great convenience, it can not only simulation analysis can also optimize and transform production processes.In order to realize the process simulation and parameter update, the Aspen Plus DSTWU simple distillation module and RadFrac module are precise separation of predistillation tower of 100000 t/a benzene hydrogenation process of extractive distillation of the selected (T501), extractive distillation column (T502), benzene distillation (T503) were simulated and optimized, and puts forward the the optimization suggestions for improvement. In this paper, the results are as follows:(1) the predistillation tower is now run by DSTWU (T501) simple optimization module after the discovery of the distillation tower, the minimum reflux ratio is 11, the minimum number of theoretical plates was 54, and when R=1.5Rmin actual reflux ratio of R is 17, the theoretical plate of NT is 81, NF is 48 feed plate. At the same time draw the NT--R diagram, and put forward when the number of theoretical plate between 76 and 86 in the process of industrialization is more favorable. The use of RadFrac precision separation module simulation according to the plate number and fluid composition table found in forty-fifth plates when the fluid component is closest to the given value 0.9396. So after the precise module of RadFrac, the pre distillation column (T501) of the feed position by forty-eighth plates, forty-fifth plates for adjustment suggestions.(2) for the operation of the extractive distillation column (T502) using DSTWU simple optimization module after the discovery of the distillation tower, the minimum reflux ratio is 2, the minimum number of theoretical plates was 8, and when the actual return R=1.5Rmin when R is 3, the theoretical plate of NT is 13, NF is 8 feed plate. At the same time draw the NT--R diagram, and put forward when the number of theoretical plate between 16 and 26 in the process of industrialization is more favorable. The use of RadFrac precision separation module simulation according to the plate number and fluid composition table found in twenty-third plates when the fluid component is closest to the given value 0.9571. So after the precise module of RadFrac, the extractive distillation column (T5O2) of the total number of plates from 13 pieces shall be adjusted to 30 pieces, feed position by eighth plates, twenty-third plates for adjustment suggestions.(3) for benzene distillation tower is now run by DSTWU (T503) simple distillation optimization module after the discovery of the tower, the minimum reflux ratio is 2, the minimum number of theoretical plates was 29, and when the actual return R=1.5Rmin when R is 3, the theoretical plate of NT is 48, NF is 19 feed plate. At the same time draw the NT--R diagram, and put forward when the number of theoretical plate between 36 and 46 in the process of industrialization is more favorable. The use of RadFrac precision separation module simulation according to the plate number and fluid composition table found in twenty-third plates when the fluid component is closest to the given value 0.9466. So after the precise module of RadFrac, the benzene distillation column (T5O3) of the feed position by nineteenth plates, twenty-third plates for adjustment suggestions.