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Consider the following flowchart where a reverse osmosis unit is used to desalinize scawater. A seawater stream (Feed, Stream # 1) contains 5 weight % salt (S) and a balance water (W). A reverse osmosis unit (called Reverse Osmosis Separator in the flowchart) has been installed to remove a fraction of the salt and produce desalinized water (also called potable water). The exit stream from the separator (stream #4, also called brine waste) is split into streams 5 and 6. Stream # 6 is recycled back and mixed with the Feed stream before they enter the Separator. • Basis: 100 kg/hr Feed Stream # 3 contains 1 weight % salt and balanced water • 5% of the total salt entering the separator through stream #2 leaves from stream 3. Stream # 5 contains 10 weight % salt. Feed-100 kgle 2 Revene Osnosi Separator 5% S Brine Waste 95% W 10% S 90% W S Sali W: Water all fractions are in weight percent Potable water ) 1% S a) Complete the flowchart and perform the degree of freedom analysis. b) Calculate the unknown flow rates and composition of streams (show your solution) and complete the following Table. Feed 2 Stream name Total mass (kg/hr) 100 S weight % W weight % 3 4 5 6 5 1 10 95 99 90

Consider the following flowchart where a reverse osmosis unit is used to desalinize scawater. A seawater stream (Feed, Stream # 1) contains 5 weight % salt (S) and a balance water (W). A reverse osmosis unit (called Reverse Osmosis Separator in the flowchart) has been installed to remove a fraction of the salt and produce desalinized water (also called potable water). The exit stream from the separator (stream #4, also called brine waste) is split into streams 5 and 6. Stream # 6 is recycled back and mixed with the Feed stream before they enter the Separator. • Basis: 100 kg/hr Feed Stream # 3 contains 1 weight % salt and balanced water • 5% of the total salt entering the separator through stream #2 leaves from stream 3. Stream # 5 contains 10 weight % salt. Feed-100 kgle 2 Revene Osnosi Separator 5% S Brine Waste 95% W 10% S 90% W S Sali W: Water all fractions are in weight percent Potable water ) 1% S a) Complete the flowchart and perform the degree of freedom analysis. b) Calculate the unknown flow rates and composition of streams (show your solution) and complete the following Table. Feed 2 Stream name Total mass (kg/hr) 100 S weight % W weight % 3 4 5 6 5 1 10 95 99 90

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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Consider the following flowchart where a reverse osmosis unit is used to desalinize seawater. A seawater stream (Feed, Stream # 1) contains 5 weight % salt (S) and a balance water (W). A reverse osmosis unit (called Reverse Osmosis Separator in the flowchart) has been installed to remove a fraction of the salt and produce desalinized water (also called potable water). The exit stream from the separator (stream #4, also called brine waste) is split into streams 5 and 6. Stream # 6 is recycled back and mixed with the Feed stream before they enter the Separator. • Basis: 100 kg/hr Feed • Stream # 3 contains 1 weight % salt and balanced water 5% of the total salt entering the separator through stream #2 leaves from stream 3. • Stream # 5 contains 10 weight % salt. Feed-100 kg le 2 Revese Osnosi Separator 5% S Brine Waste 95% W 10% S 90s W S. Salt Potable water () W: Water all fractions e in I% S weight percent a) Complete the flowchart and perform the degree of freedom analysis. b) Calculate the unknown flow rates and composition of streams (show your solution) and complete the following Table. Feed 2 Stream name Total mass (kg/hr) 100 S weight % W weight % 3 4 5 6 5 10 95 99 90
Transcribed Image Text:Consider the following flowchart where a reverse osmosis unit is used to desalinize seawater. A seawater stream (Feed, Stream # 1) contains 5 weight % salt (S) and a balance water (W). A reverse osmosis unit (called Reverse Osmosis Separator in the flowchart) has been installed to remove a fraction of the salt and produce desalinized water (also called potable water). The exit stream from the separator (stream #4, also called brine waste) is split into streams 5 and 6. Stream # 6 is recycled back and mixed with the Feed stream before they enter the Separator. • Basis: 100 kg/hr Feed • Stream # 3 contains 1 weight % salt and balanced water 5% of the total salt entering the separator through stream #2 leaves from stream 3. • Stream # 5 contains 10 weight % salt. Feed-100 kg le 2 Revese Osnosi Separator 5% S Brine Waste 95% W 10% S 90s W S. Salt Potable water () W: Water all fractions e in I% S weight percent a) Complete the flowchart and perform the degree of freedom analysis. b) Calculate the unknown flow rates and composition of streams (show your solution) and complete the following Table. Feed 2 Stream name Total mass (kg/hr) 100 S weight % W weight % 3 4 5 6 5 10 95 99 90
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