Problem D11a2 - Binary Batch Distillation  |POLVER05_0
d(T)/d(x2) =  Kc*err  #
d(L)/d(x2) =  L/(k2*x2-x2)  #
k2 =  10^(6.95464-1344.8/(T+219.482))/(760*1.2)  #
Kc =  0.5e6  #
x1 =  1-x2  #
k1 =  10^(6.90565-1211.033/(T+220.79))/(760*1.2)  #
err =  (1-k1*x1-k2*x2)  #
x2(0)=0.4
T(0)=95.5851
L(0)=100
x2(f)=0.8