Modeling and approval of vinyl acetate synthesis process from acetylene

ψ₁(L_x,t)=0, ψ₂(L,t_p)=0,



The function T(L,t) must reach a maximum in order for the test to be acceptable with respect to the criterion.
To be acceptable, the function m(t),W0(t) should reach a maximum:

Optimum process conditions for catalyst lifetime (tp=120 days), adopted in industry, are shown in Figure 4.



Figure 4. Optimal process mode (ℓ = 3 and tp = 120 days).
The acceptable temperature is a gradual increase at the beginning of the regime, and then a rapid increase in temperature from 185 0С to 230 0С (Fig. 5).

Figure 5. Process optimal mode (ℓ = 3 m; tr = 80 days)
The maximum temperature regime along the length of the tube is close to isothermal, the length of the heat spread is slightly different (Fig. 6).

Figure 6. The optimal temperature section along the length of the floor and the change in the intensity of the heat release q corresponding to it
The calculation shows that a decrease in the mixing rate is acceptable for a monotonous increase in the molar amount of acetylene at W0 (Fig. 4, 5).
According to different parameters (m and W0), the optimal process control law and the output parameter Xk can be formulated as follows: keeping the conversion level constant during most of the cycle. At the end of the process, maintaining the total length of the cycle rate conversion to 0.1-0.15, the rate of change drops.
The molar excess of acetylene m is higher than that obtained in industry, the dependence of W0 (regime at favorable temperature) is very important (Fig. 7).

Figure 7. Dependence of the criterion on the molar ratio and the rate of steam-gas mixture (ℓ = 6m, tp =80 days.
Dependence of the 1-mole ratio on the criterion at W0 =10 mol/sec*m2.