Acetaldehyde is synthesized by the catalytic dehydrogenation of ethanol: C2H5OH=CH3CHO+H2 Fresh feed (pure ethanol) is blended with a recycle stream (95 mole% ethanol and 5% acetaldehyde), and the combined stream is heated and vaporized, entering the reactor at 280°C. Gases leaving the reactor are cooled to condense the acetaldehyde and unreacted ethanol. Off-gas from the condenser is sent to a scrubber, where the uncondensed organic compounds are removed and hydrogen is recovered as a by-product. The condensate from the condenser, which is 45 mole% ethanol, is sent to a distillation column that produces a distillate containing 99 mole% acetaldehyde and a bottoms product that constitutes the recycle blended with fresh feed to the process. The production rate of the distillate is 1000 kg/h. The pressure throughout the process may be taken as 1 atm absolute. If the fresh feed to the system flows at 23.4 kmol/h, the condensate flow rate is 42.6 kmol/h, and the single-pass conversion of ethanol in the reactor is 54.6%, calculate the flow rates of ethanol and hydrogen leaving in the reactor effluent (kmol/h).
Acetaldehyde is synthesized by the catalytic dehydrogenation of ethanol:
C2H5OH=CH3CHO+H2
Fresh feed (pure ethanol) is blended with a recycle stream (95 mole% ethanol and 5%
acetaldehyde), and the combined stream is heated and vaporized, entering the reactor at 280°C.
Gases leaving the reactor are cooled to condense the acetaldehyde and unreacted ethanol. Off-gas
from the condenser is sent to a scrubber, where the uncondensed organic compounds are
removed and hydrogen is recovered as a by-product. The condensate from the condenser, which
is 45 mole% ethanol, is sent to a distillation column that produces a distillate containing 99
mole% acetaldehyde and a bottoms product that constitutes the recycle blended with fresh feed
to the process. The production rate of the distillate is 1000 kg/h. The pressure throughout the
process may be taken as 1 atm absolute.
If the fresh feed to the system flows at 23.4 kmol/h, the condensate flow rate is 42.6 kmol/h, and
the single-pass conversion of ethanol in the reactor is 54.6%, calculate the flow rates of ethanol
and hydrogen leaving in the reactor effluent (kmol/h).
The flow rate of reactor effluent is to be calculated.
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