1. What is a Bottom Product based on Boil-up Ratio Calculator?

Definition: This calculator estimates the residue flowrate from a distillation column based on the boil-up flowrate and boil-up ratio.

Purpose: It helps chemical engineers and process technicians determine the bottom product flow in distillation operations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Residue flowrate from distillation column (mol/s)
• \( V \) — Boil-up flowrate to the distillation column (mol/s)
• \( Rv \) — Boil-up ratio (dimensionless)

Explanation: The boil-up flowrate is divided by the boil-up ratio to determine the residue flowrate.

3. Importance of Residue Flowrate Calculation

Details: Accurate residue flowrate estimation ensures proper column operation, product quality control, and energy efficiency in distillation processes.

4. Using the Calculator

Tips: Enter the boil-up flowrate in mol/s and boil-up ratio (default 1.86). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the boil-up ratio?
A: The boil-up ratio is defined as the ratio of molar flowrate of vapour leaving the reboiler back into the column to the molar flowrate of liquid drawn out as bottom product.

Q2: What's a typical boil-up ratio range?
A: Common values range from 1.5 to 3.0, but this depends on the specific distillation process and desired separation.

Q3: How do I measure the boil-up flowrate?
A: The boil-up flowrate can be measured using flow meters or calculated from reboiler heat duty and vaporization enthalpy.

Q4: What affects the boil-up ratio?
A: Factors include feed composition, desired product purity, column pressure, and reboiler heat input.

Q5: Does this calculation account for column efficiency?
A: No, this is a theoretical calculation. Actual operation may require adjustments based on column efficiency.