Question

Question Five (15 marks) Sugars such as pentoses can be dehydrated to furfural using acidic ion-exchange resins such as-n- butyl-3-methylimidazolium chloride as a heterogeneous catalyst. The pentoses are present in dilute concentrations, and the reaction is considered to take place instantaneously at the external catalyst pellet surface. a) What is the overall rate of the reaction? One catalyst pellet is 0.01 m in diameter, the bulk concentration of the reactant is 0.01 mol/m3, the free system liquid velocity is 1.2 m/s, the kinematic viscosity is 3.3 x 10 m'/s, and the liquid diffusivity of the pentoses in an ionic liquid solvent is 1.7 x 101"m2/s. what is the value of the Thiele modulus, if k-2 x 10° m/s, R What does the Thiele modulus tell you about the rate limiting step and the value of η? Based on the value of the Thiele modulus, how would you plate this catalyst with gold? (5 marks) 0.02 m and D.-5 x 106 m3/s? 2 marks) b) c) (5 marks) d) 3 marks)

Answer 1

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