Question

Consider a process to make acetaldehyde by dehydrogenation of ethanol over a silver catalyst (Aguilo and Penrod, 1976), as illustrated in Figure 5.16.
The following design constraints must be satisfied:
(1) Ethanol decomposes to form acetaldehyde and hydrogen,
C2H5OH C2H3OH + H2 (5.22)
(2) The equilibrium limit is about 35 percent conversion per pass, so that a recycle stream is necessary;
(3) Acetaldehyde reacts to form a number of side-products, including ethyl acetate, acetic acid, and butanol; only ethyl acetate is considered here,
C2H3OH 1C2H5-CO-OCH3 (5.23)
(4) The conversion per pass is about 2 percent for the reaction in Eq. (5.23);
(5) The reactor effluent must be separated to remove hydrogen;
(6) The acetaldehyde must be separated;
(7) The ethyl acetate and water must be removed;
(8) Ethanol must be recycled.
Make a mass balance using Excel with the following separations:
(1) 99 percent of the hydrogen and 0.1 percent of the other components go out of the overhead of the first splitter;
(2) 99 percent of the acetaldehyde, 100 percent of the hydrogen, and 0.5 percent of the other components go out of the overhead of the second splitter;
(3) 99 percent of the ethanol and 1 percent of the other components go out of the overhead of the third splitter.
6  


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Answer 1

Answer:

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