7. The crude oil is fed to a washing unit and in this unit it is mixed with fresh water fed to the washing unit. Crude oil contains salt and oil. There are two exit streams from washing unit. The first stream is the oil stream. The oil stream contains 5% salt but not water. The second stream is "spent wash water" stream. This stream contains 15% salt and the balance water. The mass ratio of crude oil to fresh water used is 4:1. All compositions are given on mass basis. a) Draw and label a flowchart to this process b) Do the degree of freedom analysis. Prove that for an assumed basis of calculation, flow rate and compositions of all process streams can be calculated from the given information. c) Calculate flow rate and compositions of all process streams for 100 kg of oil stream taken as product.

7. The crude oil is fed to a washing unit and in this unit it is mixed with fresh water fed to the washing unit. Crude oil contains salt and oil. There are two exit streams from washing unit. The first stream is the oil stream. The oil stream contains 5% salt but not water. The second stream is "spent wash water" stream. This stream contains 15% salt and the balance water. The mass ratio of crude oil to fresh water used is 4:1. All compositions are given on mass basis. a) Draw and label a flowchart to this process b) Do the degree of freedom analysis. Prove that for an assumed basis of calculation, flow rate and compositions of all process streams can be calculated from the given information. c) Calculate flow rate and compositions of all process streams for 100 kg of oil stream taken as product.

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter20: Environmental Chemistry-earth's Environment, Energy, And Sustainability

Section: Chapter Questions

Problem 41PS

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