OP-II-3

PP-II-41activity, relative unit1,210,80,60,40,2Coke, mass %3025201510500 500000 1000000 1500000volume of raw materials recycled, tcurrent activityoptimal activityFig. 1. Dependence of the catalyst R-98activity on volume of recycled raw materials00 500000 1000000 1500000volume of raw materials recycled, tcurrent activityoptimal activityFig. 2. The coke accumulationon the catalyst R-98Our researches were carried out on the reforming unit with a fixed-bed of catalyst.The results showed that during the studied period the value of the current activitywas higher than optimal (Fig. 1). This led to the increasing of coke accumulation – upto 20 mass % by the end of the cycle. But it would be less (18.25 %) if the currentactivity was equal to the optimal activity at a given octane number (Fig. 2).The product yield is higher by 2.18 % when the catalyst works at optimal activity.Taking into account that in Russia 1 ton of gasoline with octane number 92 costs335.5 dollars the average lost profits of companies working at current activity is anaverage of 2.69 million dollars per year (Table 1).Raw materialsrecycled,mln. tonTable 1. The lost profit of a company working at current activityProduct yield, mass %CurrentactivityOptimalactivityLoss of rawmaterial,mass %Loss,mln. dollars/year0.04 82.96 86.53 3.57 0.480.07 84.36 87.27 2.91 0.680.09 85.69 87.29 1.60 0.480.13 84.47 87.10 2.63 1.150.17 85.35 87.90 2.55 1.450.33 85.84 88.51 2.67 2.960.42 85.88 87.94 2.06 2.900.61 83.69 87.67 3.98 8.151.09 85.54 86.74 1.20 4.392.16 86.57 87.86 1.29 9.35Average 85.18 87.36 2.18 2.69Thus, application of the software mathematical model based on physicochemicalprinciples makes it possible to optimize the reactor work and reduce production cost.409