Urea dissolved in aqueous solution is degraded to ammonia and CO₂ by the enzyme usease immobilized on surfaces of nonporous polymeric beads. Conversion rate is controlled by the transfer of urea to the surface of the beads through liquid film, and the conversion takes place on the surfaces of the beads. The following parameters are given for the system K₁ = 0.2 cm/s; Km = 200 mg/L; Vm= 0.1 mg urea/cm² support surface - s; Sb=1000 mg urea/L. a) Determine the surface concentration of urea b) Determine the rate of urea degradation under mass-transfer-controlled conditions
Urea dissolved in aqueous solution is degraded to ammonia and CO₂ by the enzyme usease immobilized on surfaces of nonporous polymeric beads. Conversion rate is controlled by the transfer of urea to the surface of the beads through liquid film, and the conversion takes place on the surfaces of the beads. The following parameters are given for the system K₁ = 0.2 cm/s; Km = 200 mg/L; Vm= 0.1 mg urea/cm² support surface - s; Sb=1000 mg urea/L. a) Determine the surface concentration of urea b) Determine the rate of urea degradation under mass-transfer-controlled conditions
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Urea dissolved in aqueous solution is degraded to ammonia and CO₂ by the enzyme usease
immobilized on surfaces of nonporous polymeric beads. Conversion rate is controlled by
the transfer of urea to the surface of the beads through liquid film, and the conversion takes
place on the surfaces of the beads. The following parameters are given for the system
KL = 0.2 cm/s;
Km = 200 mg/L;
Vm'= 0.1 mg urea/cm² support surface — s;
Sb=1000 mg urea/L.
a) Determine the surface concentration of urea
b) Determine the rate of urea degradation under mass-transfer-controlled conditions.
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