In a multiple effect (effect = number of equipment/evaporators), vapor from previous equipment/effect is used to heat the next equipment/effect for evaporation. The first effect is heated directly with steam, which is recovered at the same amount. A triple-effect evaporator (fig.1) is to concentrate NaOH solution from 10 to 60% by mass. The last two effects have equal rate of evaporation and 32.75% of the total water in the feed is evaporated in the first effect. If mixed feed arrangement (I-III-II) is to be used, as shown in the figure, calculate the concentration of the solution leaving each effect. Use a basis of 100 kg feed. (Note that the steam enters the steam chest but does not come into contact with the liquid.)
In a multiple effect (effect = number of equipment/evaporators), vapor from previous equipment/effect is used to heat the next equipment/effect for evaporation. The first effect is heated directly with steam, which is recovered at the same amount. A triple-effect evaporator (fig.1) is to concentrate NaOH solution from 10 to 60% by mass. The last two effects have equal rate of evaporation and 32.75% of the total water in the feed is evaporated in the first effect. If mixed feed arrangement (I-III-II) is to be used, as shown in the figure, calculate the concentration of the solution leaving each effect. Use a basis of 100 kg feed. (Note that the steam enters the steam chest but does not come into contact with the liquid.)
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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In a multiple effect (effect = number of equipment/evaporators), vapor from previous equipment/effect is used to heat the next equipment/effect for evaporation. The first effect is heated directly with steam, which is recovered at the same amount. A triple-effect evaporator (fig.1) is to concentrate NaOH solution from 10 to 60% by mass. The last two effects have equal rate of evaporation and 32.75% of the total water in the feed is evaporated in the first effect. If mixed feed arrangement (I-III-II) is to be used, as shown in the figure, calculate the concentration of the solution leaving each effect. Use a basis of 100 kg feed. (Note that the steam enters the steam chest but does not come into contact with the liquid.)
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