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Table 3 Results with feasible solutions obtained with the traditional pre-design method, which uses fixed fractions

From: Modified method to improve the design of Petlyuk distillation columns

Solution type

Description of the solution type

Case of study number (see Table 1)

A

Feasible solution with all satisfied specifications

5, 32, 51, 70, 71, 80, 84, 89

B

Feasible solution with two output purity specifications satisfied

3, 24, 27, 33, 42, 44, 47, 50, 52, 55, 57, 59, 64, 67, 73, 78, 81, 86, 87

C

Feasible solution with one output purity specification satisfied

4, 17, 23, 30, 38, 41, 61, 83, 90

D

Infeasible solution. There is no convergence in the pre-design stage

1, 2, 6, 7, 8, 9 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 25, 26, 28, 29, 31, 34, 35, 36, 37,39, 40, 43, 45, 46, 48, 49, 53, 54, 56, 58, 60, 62, 63, 65, 66, 68, 69, 72, 74, 75, 76, 77, 79, 82, 85, 88