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Perform a preliminary design evaluation for a plant to produce 30,000 te/yr of Maleic Anhydride (MA), C4H2O3, from a liquid feedstock containing 95% n-butane.
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CET PART IIA EXERCISE 6 Process Synthesis 25th February 2003 Introduction The objective of the exercise is to perform a preliminary design evaluation for a plant to produce 30,000 te/yr of Maleic Anhydride (MA), C4H2O3, from a liquid feedstock containing 95% n-butane. The remaining 5% of the feed is iso-butane, which is taken to form carbon dioxide instantaneously under the reactor conditions. The reactor must be kept above 100 ºC everywhere to prevent condensation on the catalyst. The reactor operates around 400 ºC and 2.5 bara. Reaction Scheme The following reactions will take place in the reactor: C4H10 + 3.5O2 ? C4H2O3 + 4H2O C4H10 + 6.5O2 ? 4CO2 + 5H2O The selectivity of generating Maleic Anhydride, is given by S = 0.70 - 0.3X2 [1] where X is the conversion of n-butane Figure 1 below shows the distribution of products. Figure 1: Diagram showing distribution of products Using the information in Figure 1, the required flowrate of n-butane in the feed...
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