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1. Two salts A and B are dissolved in water. At the temperature of the experiment, the solubility of A is 1 kg A/kg pure water and that of B is 0.4 kg /kg water. It will be assumed that the solubilities of the two

1. Two salts A and B are dissolved in water. At the temperature of the experiment, the solubility of A is 1 kg A/kg pure water and that of B is 0.4 kg /kg water. It will be assumed that the solubilities of the two

Introduction to Chemical Engineering Thermodynamics
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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1. Two salts A and B are dissolved in water. At the temperature of the experiment, the solubility of A is 1 kg A/kg pure water and that of B is 0.4 kg /kg water. It will be assumed that the solubilities of the two salts are not affected by the presence of each other. If originally 20 kg of A and 20 kg B are dissolved in 100 kg water, and some of the water is evaporated from solution, calculate the: (1) amount evaporated (2) weight of mother liquor (3) composition of mother liquor (4) weight of each crystal formed for the following cases: a) 50% of the water is evaporated b) Enough water is evaporated to reduce the total weight of the solution to 50% of the original value c) Enough water is evaporated to leave the solution saturated with A, without crystallizing any A d) Enough water is evaporated so that the remaining solution is 50% of the original value.
Transcribed Image Text:1. Two salts A and B are dissolved in water. At the temperature of the experiment, the solubility of A is 1 kg A/kg pure water and that of B is 0.4 kg /kg water. It will be assumed that the solubilities of the two salts are not affected by the presence of each other. If originally 20 kg of A and 20 kg B are dissolved in 100 kg water, and some of the water is evaporated from solution, calculate the: (1) amount evaporated (2) weight of mother liquor (3) composition of mother liquor (4) weight of each crystal formed for the following cases: a) 50% of the water is evaporated b) Enough water is evaporated to reduce the total weight of the solution to 50% of the original value c) Enough water is evaporated to leave the solution saturated with A, without crystallizing any A d) Enough water is evaporated so that the remaining solution is 50% of the original value.
2. In a plastic manufacturing concern, air is used to dry plastic sheets in which acetone is used as solvent, The acetone in the air is recovered by absorption in pure water in a packed tower. 1000 kg-mol/hr of an air-acetone mixture containing 4 mole% acetone is to be scrubbed to a mixture containing 0.06 mole% acetone. The tower is to be operated such that the kg absorbing water/kg acetone-free air is 1.5. What is the flow rate and composition of the outgoing liquid stream? What is the flow rate of the exit gas stream at 758 mm Hg and 30°C? Neglect the water vapor in the exit gas stream.
Transcribed Image Text:2. In a plastic manufacturing concern, air is used to dry plastic sheets in which acetone is used as solvent, The acetone in the air is recovered by absorption in pure water in a packed tower. 1000 kg-mol/hr of an air-acetone mixture containing 4 mole% acetone is to be scrubbed to a mixture containing 0.06 mole% acetone. The tower is to be operated such that the kg absorbing water/kg acetone-free air is 1.5. What is the flow rate and composition of the outgoing liquid stream? What is the flow rate of the exit gas stream at 758 mm Hg and 30°C? Neglect the water vapor in the exit gas stream.
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