Internal Reflux Ratio Formula:
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Definition: The Internal Reflux Ratio is the ratio of the liquid flowrate from the reflux drum back to the distillation column to the flowrate of distillate taken as product.
Purpose: It's a crucial parameter in distillation column design and operation, affecting separation efficiency and energy consumption.
The calculator uses the formula:
Where:
Explanation: The ratio compares the amount of liquid returned to the column versus the amount withdrawn as product.
Details: Proper reflux ratio ensures optimal separation of components, affects column diameter and height requirements, and impacts energy costs.
Tips: Enter both flowrates in moles per second. The reflux flowrate should typically be greater than the distillate flowrate.
Q1: What's a typical internal reflux ratio value?
A: Common values range from 1.5 to 10, depending on the separation difficulty and energy considerations.
Q2: How does reflux ratio affect column operation?
A: Higher ratios improve separation but increase energy costs and may require larger column diameters.
Q3: What's the difference between internal and external reflux ratio?
A: Internal ratio uses the actual liquid flow inside the column, while external ratio uses the reflux drum flow.
Q4: When would I use a very high reflux ratio?
A: For difficult separations where components have similar boiling points.
Q5: Can the reflux ratio be less than 1?
A: Yes, but this indicates more product is being taken than liquid is being returned, which may compromise separation quality.