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Lecture 10

PROCTECH 2EC3 Lecture 10: Week 6

6 Pages
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Department
Process Automation Technology
Course Code
PROCTECH 2EC3
Professor
Kostas Apostolou

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Description
th Week 6: Feb. 6 , 2018 6.90 Benzene and Hexane are being considered as solvents to extract acetic acid from aqueous mixtures. At 30, distribution coefficients for the two solvents ar = 0.098 mass fraction acetic acid in Benzenemass fraction acetic acid in water and = 0.017 mass fraction acetic acid in Hexanemass fraction acetic acid in water. a. Based on the distribution coefficients only, which of the two solvents would you use and why? Demonstrate the logic of your decision by comparing the quantities of the two solvents required to reduce the acetic acid content in 100 kg of an aqueous solution from 30 to 10 . Total: + = + 100 = + ( )( ) ( ) ( ) ( ) Acetic Acid: 0.3 100 + 0 = 0.1 + 30 = 0.1 + Water: 0.7 100 + 0 = 0.9 + 0 70 = 0.9 Benzene: 0 100 + 1 = 0 1 1 Distribution Coefficient: = 0.098 = 0.098 = . . 30 0.1 30 0.1 77.78 ) . 30 = 0.1 77.78 + = = . 0.0098 Total: = 77.78 + 2267.5 100 . If Hexane is used instead of Benzene: Mass balance would be the same, but the distribution coefficient is different. Distribution Coefficient. = 0.017 = . 30 0.1 30 (0.1)(77.78) 77.78 30 = 0.1 77.78 + = = 0.0017 Total: = 77.78 13072 100 Therefore, use Benzene because its less equipment.
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