The vapor leaving the top of a distillation column goes to a condenser in which either total or partial condensation takes place. If a total condenser is used, a portion of the condensate is returned to the top of the column as refux and the remaining liquid is taken off as the overhead product (or distillate). If a partial condenser is used, the liquid condensate is returned as reflux and the uncondensed vapor is taken off as the overhead product. The overhead product from an n-butane-n-pentane distillation column is 93 mole% butane. The temperature of the cooling fluid limits the condenser temperature to 39 °C or higher. REFLUX DRUM a) Using Raoult's law, estimate the minimum pressure at which the condenser can operate as a partial condenser (i.e., at which it can produce liquid for reflux) b) The production rate of overhead product is 50 kmol/h, and the mole ratio of reflux to overhead product is 2:1. Calculate the molar flow rates and compositions of the reflux stream and the vapor feed to the condenser. Vapor from top of column Reflux [liquid) PARTIAL CONDENSER & Cooling fluid Overhead product (vapor)
The vapor leaving the top of a distillation column goes to a condenser in which either total or partial condensation takes place. If a total condenser is used, a portion of the condensate is returned to the top of the column as refux and the remaining liquid is taken off as the overhead product (or distillate). If a partial condenser is used, the liquid condensate is returned as reflux and the uncondensed vapor is taken off as the overhead product. The overhead product from an n-butane-n-pentane distillation column is 93 mole% butane. The temperature of the cooling fluid limits the condenser temperature to 39 °C or higher. REFLUX DRUM a) Using Raoult's law, estimate the minimum pressure at which the condenser can operate as a partial condenser (i.e., at which it can produce liquid for reflux) b) The production rate of overhead product is 50 kmol/h, and the mole ratio of reflux to overhead product is 2:1. Calculate the molar flow rates and compositions of the reflux stream and the vapor feed to the condenser. Vapor from top of column Reflux [liquid) PARTIAL CONDENSER & Cooling fluid Overhead product (vapor)
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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Transcribed Image Text:The vapor leaving the top of a distillation
column goes to a condenser in which either
total or partial condensation takes place. If
a total condenser is used, a portion of the
condensate is returned to the top of the
column as refcr and the remaining liquid
is taken off as the overhead product (or
distillate). If a partial condenser is used, the liquid condensate is returned as reflux and the
uncondensed vapor is taken off as the overhead product. The overhead product from an
n-butane-n-pentane distillation column is 93 mole% butane. The temperature of the
cooling fluid limits the condenser temperature to 39 °C or higher.
REFLUX DRUM
a) Using Raoult's law, estimate the minimum pressure at which the condenser can operate
as a partial condenser (i.e., at which it can produce liquid for reflux)
b) The production rate of overhead product is 50 kmol/h, and the mole ratio of reflux to
overhead product is 2:1. Calculate the molar flow rates and compositions of the reflux
stream and the vapor feed to the condenser.
Vapor from
top of column
Reflux
(liquid)
PARTIAL
CONDENSER
- Cooling fluid
Overhead
product (vapor)
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