(a) Interpretation: The molar flow rates of the product streams, the temperature (°C) and pressure (mm Hg) of the system should be calculated. Concept introduction: The evaporator is a device which is used to convert the chemical substance in liquid form to gaseous form or vapor form. Liquid is evaporated into gas or vapors in the process.

Question

Q2: A stream of liquid water at a rate of N lit/s with a stream of methanol and ethanol mixture (contains 25 mol% methanol) are fed to continues evaporator. Another stream of methanol at a molar flow rate of G that of the alcohol mixture stream is fed to the same unit. If the liquids are evaporated totally and the produced vapor stream contains (0.1"G) mol% of water at a pressure of 28 psi and 220 F. calculate: 1- The flow rate and composition of all streams in a molar, mass, and volumetric basis 2- The average molecular mass of all streams The Specific gravity of methanol is 0.762 and that of ethanol is 0.789 while the density of vapors can be estimated as: p= p*Mw/RT where R-0.082 atm.m'/kmol.K.

Answer 1

Question

Chapter 6, Problem 6.76P

Interpretation Introduction

(a)

Interpretation:

The molar flow rates of the product streams, the temperature (°C) and pressure (mm Hg) of the system should be calculated.

Concept introduction:

The evaporator is a device which is used to convert the chemical substance in liquid form to gaseous form or vapor form. Liquid is evaporated into gas or vapors in the process.

Interpretation Introduction

(b)

Interpretation:

Analytical lab made a mistake in determining the composition of the mixture and product streams found to contain 22.3 mol% acetone. Give other possible reasons for the discrepancy.

Concept introduction:

The evaporator is a device which is used to convert the chemical substance in liquid form to gaseous form or vapor form. Liquid is evaporated into gas or vapors in the process.

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