QUESTION 1: Which of the following is not a purpose of a recycle stream? a. To increase single-pass conversion b. To reprocess unused reactant. c. To increase overall conversion. d. To recover catalysts.

REACTION ENGINEERING    Consider a heterogeneous gas-phase catalytic reaction:AB(g)→A(g)+B(g) (Catalyst) The surface reaction mechanism follows three steps: AB(g) +S <----> AB*S (Adsorption)AB*S<----> B*S+A(g) (Surface reaction)B*S <---> B(g) + S (Desorption) (a) Derive the rate law assuming  (1) surface reaction is rate limiting, and (2) desorption is rate-limiting. Express the overall reaction rate (- Tan) in terms of total number of sites on the surface, C. partial pressures of the gas species (ie., Pab Pa and Pb), rate constants of adsorption, the surface reaction, and desorption (ka,ks, and kd), and the equilibrium constants of adsorption, the surface reaction, and desorption (ie., Ka. Ks and Kd).

A co-polymer AB2 is to be made from its constituent monomers A and B according to the equation where C is a catalyst required for the reaction. It is known that the reaction also generates an impurity I at a rate of 0.001 moles of I/ mole of AB2 generated. A manufacturing process is set up in such a way that a feed stream containing pure A and B are sent to the reactor along with another stream of catalyst C which contains 400 ppm of I. It is known that a 5% excess of B has been charged into the reactor. The exit stream from the reactor is sent to a separator which generates a product A and B Catalyst +I A + 2B+C ⇒ AB2 + C Reactor 3 Separator Figure 2: Polymer synthesis 5 Products and unreacted reactants Catalyst +I stream containing AB2 and any unreacted reactants and a catalyst stream containing the recovered catalyst and any impurities. Assuming a basis of 45 moles/h of product AB2 and steady state,

Reaction engineering  Please derive the rate law equation (rp ) for the following enzymatic reaction with with inhibition from the product P  E+S <-------> E*S (k1 in the foward direction and k2 backwards) E*S -----------> E+P (k3) E+P <-------> E*P    (k4 in the foward direction and k5 backwards )