CHBE470_Homework9

CHBE470_Homework9 - CHBE 470 Control Design Problem Maleic...

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CHBE 470 Control Design Homework Page 1 Due November 30, 2007 CHBE 470 -- Control Design Problem Maleic Anhydride Plant Homework #9 - Due November 30, 2007 The feed preparation and reaction section of a Maleic Anhydride plant is shown in the following sketch. In this exercise, you will design controls for this plant. You may not add any equipment. In this section of the plant, n-butane is vaporized by steam, then combined with air and sent to a fixed-bed reactor. The desired main reaction is C 4 H 10 + 7/2 O 2 C 4 H 2 O 3 + 4H 2 O. A few notes: Air/hydrocarbon mixtures require tight control of the reactor composition to keep the mixture from reaching explosive limits. This is a safety issue. In this reaction, the desired value of the analyzer A1 is 1.8% n-butane. More air moves the mixture away from the explosive limit. For tight composition control, it's best to manipulate the smaller flow. Suction throttling is a common way of controlling the flow through a compressor that has
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This note was uploaded on 10/04/2009 for the course CHE 470 taught by Professor Smith during the Spring '09 term at Rice.

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CHBE470_Homework9 - CHBE 470 Control Design Problem Maleic...

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