0.25 mol fraction methanol. The actual overhead composition is 316/1122 = 0.2817mol fraction methanol, so the overhead is close to the azeotropes of the C5 components with methanol.
The amount of TAME produced is 232kmol/h, which consumes 232kmol/h of methanol. Note that this is equal to the fresh feed of methanol into the plant. However, the total amount of methanol fed to the column/prereactor must be
232 + 316 = 548 kmol/h methanol
The large amount of methanol in the overhead must be recovered and recycled. In a later section of this chapter two types of methanol recovery flowsheets are developed and their TACs are compared.
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