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Complex Distillation Column By: Dr. Gerardo Ruiz LPPD UIC 10/22/2008

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Complex Distillation Column Optimal complex column configuration is estimated to harness energy savings up to 70% Difference Point Equation Model Ternary System Examples Conclusion

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Complex Distillation Column This complex column has two feed streams and three product streams Constant molar overflow is assumed in all sections of the column Constant volatility Isobaric process

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Difference point equation The compositions and flow rates at the top of the section are know Doing a mass balance: Expressing the x n composition in terms of x n+1, by expanding it as a first order Taylor series

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Difference Point Equation Rearranging the mass balance, and defining The difference point equation is:

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Degree of Freedom Analysis Variables: 10 + 5*3 = 25 Equations: 9, equations (1) to (9) Design Specifications: 6 Problem Specification: 10 DOF=25 – 9 – 6 - 10 = 0

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Equations

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Solution Strategy A design is feasible if and only if the composition profiles between the neighboring two sections intersect the composition at each end of column section must be known

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Solution Strategy At the first section ( S 1 ):

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Solution Strategy At the fourth section ( S 4 ):

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Solution Strategy

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S j : j=1, 2, 3, 4. i=1, 2, 3 Section S1S1 S2S2 S3S3 S4S4 Initial Cond.

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Case of Study 1

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Case of Study 2

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Conclusion What we know: Ternary system i =k, Underwood, Ideal, Non-Ideal Single columns complex columns Quaternary system i =k, Underwood Single columns Single complex column What we dont know: Quaternary systems DOF 3c DOF 4c Ideal, Non-Ideal Single columns complex columns Partial condenser q 1 q 2, and q j 1 or 0

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Thanks!!!!!! QUESTIONS????

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