Page 216 - Chemical engineering design

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FLOW-SHEETING
containing around 0.5 per cent w/w MEK, is recycled to the absorption column.
The extract, which contains around 20 per cent w/w MEK, and a small amount
of butanol and water, is fed to a distillation column.
5. A distillation column, which separates the MEK and alcohol from the
solvent TCE.
The solvent containing a trace of MEK and water is recycled to the extraction
column.
6. A second distillation column, which produces a pure MEK product from the
crude product from the first column. The residue from this column, which
contains the bulk of the unreacted 2-butanol, is recycled to the reactor.
For a production rate of 1250 kg/h MEK:
1. Draw up an information flow diagram for this process.
2. Estimate the split-faction coefficients and fresh feeds for each stage.
3. Set up the resulting material balance equations, in matrix form.
4. Solve the equations using a suitable spread-sheet.
5. Adjust the values chosen for the split-fractions and feeds, so the results meet
the constraints,
6. Draw a flow-sheet for the process.

Postscript: The design problems given in Appendix F provide more problems in flow-sheeting.