Chemical Reaction Engineering For the liquid phase parallel reactions:R, rR = K?.CA2; E? = 80 KJ/moleS, rS = K?.CA ; E? = 120 KJ/mole The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at Low temperature in a PFR High temperature in a PFR High temperature in a CSTR Low temperature in a CSTR Low temperature in a PFR High temperature in a PFR High temperature in a CSTR Low temperature in a CSTR ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The rate expression for a heterogenous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + Kr.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) E + ΔHA ΔHA + ΔHR E E + ΔHA - ΔHR E + ΔHA ΔHA + ΔHR E E + ΔHA - ΔHR ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering From Arhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is K cal. °K K cal °K K cal/°K K cal. °K K cal °K K cal/°K ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction. Equal to Equal to or more than More than Less than Equal to Equal to or more than More than Less than ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A. Surface reaction between absorbed A and absorbed B Absorption of A Surface reaction between absorbed A and B in the gas phase Surface reaction between A in the gas phase and absorbed B Surface reaction between absorbed A and absorbed B Absorption of A Surface reaction between absorbed A and B in the gas phase Surface reaction between A in the gas phase and absorbed B ANSWER DOWNLOAD EXAMIANS APP
Chemical Reaction Engineering A first order reaction requires two equal sized CSTR. The conversion is Less when they are connected in series More when they are connected in parallel Same whether they are connected in series or in parallel More when they are connected in series Less when they are connected in series More when they are connected in parallel Same whether they are connected in series or in parallel More when they are connected in series ANSWER DOWNLOAD EXAMIANS APP
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