Homework 1 Problem 6 SuperPro Designer Aspirin

# Homework 1 Problem 6 SuperPro Designer Aspirin -...

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Homework 1 Problem 6 SuperPro Designer™ Aspirin 20 points possible due Friday September 2, 2011 Grader: Israel Problem Statement: Aspirin is manufactured batch wise from salicylic acid and acetic anhydride . The reaction stoichiometry is defined as C 7 H 6 O 3 + C 4 H 6 O 3 C 9 H 8 O 4 + C 2 H 4 O 2 with an estimated kinetic rate expression of r Aspirin = k[C 7 H 6 O 3 ][C 4 H 6 O 3 ] where the pre exponential factor (k) is equal to 0.0059 m 3 /mol · s and the activation energy is 3 e6 J/kmol. A typical process consists of a 2 m 3 reactor charged with equal molar amounts of salicylic acid and acetic anhydride . The reactor is kept at atmospheric pressure and 350 K. All components are heated to 350 K before being introduced into the system, where the temperature is held constant. Determine the mass of salicylic acid remaining after the reaction has gone for 2 hours. Method of Solution: Use the RBATCH unit in AspenPlus to simulate the batch process. Solution: 1) Open the SuperPro Designer TM program and start a new process file. 2) Select “Batch Mode” and click OK.

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Note: SuperPro Designer™ uses a default annual operating time of 7,920 hours, which is the average pharmaceutical operating time per year. 3) To register the process components select Tasks Pure Components from the toolbar. 4) Type acetic acid in the source box, highlight the appropriate component, and click the Register button in the center of the edit window.
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