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For the following problem, 1 ) diagram the waste heat boiler and separation units ( with the separation units combined as a single unit )

For the following problem, 1) diagram the waste heat boiler and separation units (with the separation units combined as a single unit) and 2) indicate potential uses of exiting streams from these units. Formaldehyde is produced by decomposing methanol over a silver catalyst: CH3OH OCHO +H2. To provide heat for this endothermic reaction, some oxygen is included in the feed to the reactor, leading to the partial combustion of the hydrogen produced in the methanol decomposition. The feed to an adiabatic formaldehyde production reactor is obtained by bubbling a stream of air at 1atm through liquid methanol. To avoid deactivating the catalyst, the maximum temperature attained in the reactor must be limited to 600C. For this purpose, saturated steam at 145C is metered into the air-methanol stream, and the combined stream enters the reactor. A fractional methanol conversion of 70.0% is achieved in the reactor, and the product gas contains 5.00 mole% hydrogen. The product gas is cooled to 145C in a waste heat boiler in which saturated steam at 3.1 bar is generated from liquid water at 30C. Several absorption and distillation units follow the waste heat boiler, and formaldehyde is ultimately recovered in an aqueous solution containing 37.0wt%HCHO. (15 points)
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