Acetaldehyde is synthesized by the catalytic dehydrogenation of ethanol: 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. Assume that the vapor leaving the top tray of the distillation column is at 475 K and 1 atm, contains the same molar composition as the distillate, and flows at 1250 kg/h. What is the volumetric flow rate of this stream (SCFH)?
Acetaldehyde is synthesized by the catalytic dehydrogenation
of ethanol:
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.
Assume that the vapor leaving the top tray of the distillation column is at 475 K and 1 atm,
contains the same molar composition as the distillate, and flows at 1250 kg/h. What is the
volumetric flow rate of this stream (SCFH)?
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