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CME 1025 - Principles of Chemical Engineering

Resit Assignment

The resit case study is an INDIVIDUAL REPORT.

ELECTRONIC SUBMISSION ONLY via Canvas until

Any reports not following the submission format and guidelines

below will not be marked!

A double-effect evaporator (two evaporators in series) is used to produce

fresh water from seawater containing 3.5 wt% dissolved salts. A flowchart

for the process is shown here.

H₂O(V)

P=0.6 bar

H₂O(v)

Saturated

4 bar

Seawater, 300 K

3.5 wt% salt, 5000 kg/h

P=0.2 bar

Brine

5.5 wt% salt

H₂0(1)

sat'd, 4 bar

H₂O(v)

H₂O(l)

sat'd,

0.6 bar

Newcastle

University

Brine

Condenser

Fresh water

product

Seawater enters the first effect at 300 K at a rate of 5000 kg/h, and

saturated steam at 4.00 bar absolute is fed into a tube bundle in the first

effect. The steam condenses at 4.00 bar, and the condensate is withdrawn

at the saturation temperature corresponding to this pressure.

The heat given up by the steam condensing in the tubes causes water to

evaporate from the brine solution at the pressure of 0.60 bar maintained

in the effect. The exiting brine contains 5.5 wt% salt. The steam generated

in the first effect is fed to a tube bundle in the second effect. The

condensate from the bundle and the steam generated in the second effect

at a pressure of 0.20 bar constitute the fresh water produced in the

process.

In solving the problems to be given, assume that the brine solutions in/nboth effects have the physical properties of pure water and that the

effects operate adiabatically.

Your report should contain at least the following:

1) Detailed mass and energy balances for the process, with

calculations in an appendix.

2) Presentation of flow sheet software results, comparison with manual

calculations with discussion (submit your Aspen Hysis file aside).

3) An assessment of the sustainability of this process (0.5-1 page

Newcastle

University

guidance);

4) A safety assessment of the process, highlighting major hazards and

measures that could be taken to minimize these hazards (0.5-1 page

guidance);

one of the

5) Description of the materials selection process t

evaporators (0.5-1 page guidance).

Report Format and Submission Guidelines:

• 6 sides of A4 Maximum, plus appendices;

• 12 pt Times New Roman;

2.5 cm margins around the entire document;

Title, student number and name must be on the front page;

Match the sections of the report to the sections indicated

above;

• Good report writing guidelines (cf. CME1025) must be followed, i.e.

use of significant figures, explicit use of variables, good presentation

of graphs and tables, etc.

Report Marking Scheme

Mass and Energy balances

Process simulation flow sheet software

Health and Safety

Assessment of the sustainability of the plant

15%

Materials selection

Marks and Feedback:

Feedback will be given via CANVAS;

The marks will be released via CANVAS.

25%

25%

20%

15%

Ensure that you submit the correct files using the correct

submission portal. It will not be possible to retrieve your files

after submission, and you will only be allowed to submit once!

Fig: 1

Fig: 2

Fig: 3