Answered: Acetaldehyde is synthesized by the…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

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.

If the vapor leaving the condenser (off-gas to scrubber) is at -40 ̊C and 760 torr, what is the
molar composition of this stream?What assumption are you making when solving this problem?