Question

We want to design a reactor for the following dimerization reaction: 2 CH2=CH-CH=CH2 ? (CH2=CH-CH=CH2 )2 The reaction is to be performed at 1.5 atm, gas-phase and for XA = 0.66. Calculate: (a) the optimal temperature in a CSTR and its volume; F0 = 40 kmol h-1; yA0 = 80 mol%; yI0 (inerts) = 20 mol%, (b) initial temperature for reaching the optimal temperature operating adiabatically, (c) amount of heat required if the initial temperature is 300 K, (d) the optimal relation conversion-temperature for obtaining the same reaction rate in a PFR. ?HA800K = 37400 cal mol-1; CP|I = 7.2 cal mol-1 K-1; CP|A = 31.2 cal mol-1 K-1; second-order reaction with log(k) = 8.063 – 5470/T [ k in mol h-1 L-1 atm2]; equilibrium constant in Table 2. Table 2. Equilibrium constant (K) for different temperatures (T). K (atm)-1 22.2 12.5 7.21 4.30 2.60 1.62 0.202 0.038 T(K) 800 820 840 860 880 900 1000 1100

          We want to design a reactor for the following dimerization reaction:

2 CH2=CH-CH=CH2 ? (CH2=CH-CH=CH2 )2

The reaction is to be performed at 1.5 atm, gas-phase and for XA = 0.66. Calculate: (a) the optimal temperature in a CSTR and its volume; F0 = 40 kmol h-1; yA0 = 80 mol%; yI0 (inerts) = 20 mol%, (b) initial temperature for reaching the optimal temperature operating adiabatically, (c) amount of heat required if the initial temperature is 300 K, (d) the optimal relation conversion-temperature for obtaining the same reaction rate in a PFR. ?HA800K = 37400 cal mol-1; CP|I = 7.2 cal mol-1 K-1; CP|A = 31.2 cal mol-1 K-1; second-order reaction with log(k) = 8.063 – 5470/T [ k in mol h-1 L-1 atm2]; equilibrium constant in Table 2.

Table 2. Equilibrium constant (K) for different temperatures (T).

K (atm)-1  22.2  12.5  7.21  4.30  2.60  1.62  0.202  0.038

T(K)  800  820  840  860  880  900  1000  1100

We want to design a reactor for the following dimerization reaction:

2 CH2=CH-CH=CH2 ? (CH2=CH-CH=CH2 )2

The reaction is to be performed at 1.5 atm, gas-phase and for XA = 0.66. Calculate: (a) the optimal temperature in a CSTR and its volume; F0 = 40 kmol h-1; yA0 = 80 mol%; yI0 (inerts) = 20 mol%, (b) initial temperature for reaching the optimal temperature operating adiabatically, (c) amount of heat required if the initial temperature is 300 K, (d) the optimal relation conversion-temperature for obtaining the same reaction rate in a PFR. ?HA800K = 37400 cal mol-1; CP|I = 7.2 cal mol-1 K-1; CP|A = 31.2 cal mol-1 K-1; second-order reaction with log(k) = 8.063 – 5470/T [ k in mol h-1 L-1 atm2]; equilibrium constant in Table 2.

Table 2. Equilibrium constant (K) for different temperatures (T).

K (atm)-1 22.2 12.5 7.21 4.30 2.60 1.62 0.202 0.038

T(K) 800 820 840 860 880 900 1000 1100

Added by Brandon H.

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