4460 Lecture 5 2011

4460 Lecture 5 2011 - CHEN 4460 Process Synthesis,...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CHEN 4460 Process Synthesis, Simulation and Optimization Dr. Mario Richard Eden Department of Chemical Engineering Auburn University Lecture No. 5 Sequencing Ordinary Distillation Columns September 20, 2011 Contains Material Developed by Dr. Daniel R. Lewin, Technion, Israel Sequencing Distillation Columns Lecture 5 Objectives Understand how distillation columns are sequenced and how to apply heuristics to narrow the search for a near- optimal sequence. Be able to apply systematic methods to determine an optimal sequence of distillation-type separations. Sequencing OD Columns Use a sequence of ordinary distillation (OD) columns to separate a multicomponent mixture provided: in each column is > 1.05. The reboiler duty is not excessive. The tower pressure does not cause the mixture to approach the T C of the mixture. Column pressure drop is tolerable, particularly if operation is under vacuum. The overhead vapor can be at least partially condensed at the column pressure to provide reflux without excessive refrigeration requirements. The bottoms temperature for the tower pressure is not so high that chemical decomposition occurs. Azeotropes do not prevent the desired separation. Pressure/Condenser Algorithm Number of Sequences for OD Number of different sequences of P 1 ordinary distillation (OD) columns, N S , to produce P products: )! 1 ( ! )]! 1 ( 2 [-- = P P P N s (8.9) P # of Separators N s 2 1 1 3 2 2 4 3 5 5 4 14 6 5 42 7 6 132 8 7 429 Example: 4 Components Example: 4 Components Best Sequence using Heuristics The following guidelines are often used to reduce the number of OD sequences that need to be studied in detail: Remove thermally unstable, corrosive, or chemically reactive components early in the sequence....
View Full Document

This note was uploaded on 12/05/2011 for the course CHEM 4460 taught by Professor Eden during the Fall '11 term at Auburn University.

Page1 / 25

4460 Lecture 5 2011 - CHEN 4460 Process Synthesis,...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online