A mixture of four species needs to be fractionated. Determine the optimal sequence of columns. Two alternative

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A mixture of four species needs to be fractionated. Determine the optimal sequence of columns. Two alternative technologies are available: regular distillation and extractive distillation. The initial flowrate is 1000 mol/h and the composition in molar fraction is as follows: A50.1; B50.2;

C50.3; and D50.4. Additional data for the example:

Regular distillation,

αAB52; αBC51:5; αCD51:02; ðABCDÞ;

Extractive distillation,

αAB 52:1; αBC 51:5; αCD 51:4 ðABCDÞ:

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