A new facility to produce Monoethanolamine $($MEA$)$ is being considered due to an increase in demand. Therefore, you have been requested to design a plant to produce $10,000$ metric tons per annum of MEA $($at $99\mathrm{.}5\%$ purity$).$ The plant is to be located in Richards Bay, South Africa.

The following feed streams are available:

Ammonia feed is available at $10$atm and $50C$ from an adjacent plant. Ammonia is available as an aqueous solution of $55wt.\%$ of ammonia and $45$ wt$.\%$ water

Ethylene Oxide pure$)$ is available at $5$atm and $40C.$

A reaction temperature of $150C$ is maintained in the reactor, and a pressure of $160$ atmospheres to avoid the evaporation of ammonia.

Under specified conditions of reaction, only MEA is produced when the feed ratio of Ammonia $/$Ethylene oxide is $10.$

The plant should operate for $330$ days a year to allow for shutdown and maintenance.

You need to consider alternative design decisions.

Decide whether the process is batch or continuous.

Conduct material balances to determine the target feed requirements.

Consider whether a recycling system is required.

Consider different conversion rates to determine how this will affect the feed requirements and process flowsheet.

Determine the amount of heat to be added or removed from the system by conducting an energy balance.

Determine the thermodynamic favourability of the reaction at standard conditions and reaction conditions.

Determine process conditions for the separation units.

Determine the effect of the inerts on the system.

Determine the effect of pressure on compression work.

Provide a process and instrumentation diagram with a table containing the flowrates, compositions, temperature, and pressures of all the process streams.

You must use excel in all your calculations.

& You must compile your findings in an appropriate technical report. Please refer to Learning Unit $3$ of your workbook for information regarding how the report should be structured. Please follow the style of a technical report. Include an executive summary, introduction, conclusion, references, etc. for every report. Your workbook contains valuable information about what content is required in the report and how to structure the report. Give references for all information. Substantiate all assumptions.

Mark Scheme

The following scheme will be used to mark the assessment. A more detailed rubric is also provided.

Design decisions

Material balances

Energy balances

Equilibrium

Separation and recycle system

Separation and recycle system

$5$

$20$

$15$

$15$

$15$

Process and Instrumentation Diagram $20$