Boiling point calculation and distillation
Thread Content
Dear experts: I currently have two substances whose boiling points at 3 mmHg are 85°C and 96°C respectively. I would like to separate them using distillation. At what pressure should the distillation be carried out, and at what temperature should the products be collected?
If there are no azeotropes, distillation can be carried out directly, after all, the boiling point difference at 3 mmHg is only 11°C.
The boiling point difference cannot be used solely to determine whether distillation is possible; in most cases, a difference of more than 5°C allows for distillation, but this is not always the case – the relative volatility also plays a role
Based solely on the temperature difference, they can be separated. If possible, the pressure can also be increased to create a greater temperature difference.
The key is still the gas-liquid equilibrium data; check the relative volatility to see if there are azeotropes