How to calculate the evaporation rate of a distillation tower
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There is a distillation tower in the workshop for batch distillation; now we need to calculate the evaporation rate of this equipment – how should this be done? The solution is 5% ethanol; the reactor volume is 5000 L, with a tower diameter of 60 cm and a height of 7 m. Is there anyone who can show me how to calculate it?
The maximum evaporation rate per hour can be estimated based on the effective heat transfer area of the jacket. Choosing the heat transfer coefficient is key.
It is calculated based on the hourly production volume and the reflux ratio.
Is there a formula for it, for ordinary enamel reaction kettles?
What is needed now is to determine the hourly evaporation rate in order to decide on the equipment required for reflux
Heat transfer rate: K multiplied by S multiplied by the temperature difference. Evaporation rate: Heat divided by the vaporization latent heat of the material. The value of K can be found in chemical process design manuals. The effective heat exchange area depends on the amount of material present.
Is s the heat exchange area, and is K the heat transfer coefficient?
Yes, make sure the units are consistent. There is a significant difference in the heat transfer coefficients between metal reactors and glass-lined reactors. As evaporation occurs, the heat exchange area gradually decreases.
The amount required is just that of the steam; the latent heat of steam is roughly balanced with the latent heat of vaporization
The evaporation rate in batch distillation is closely related to the operating time; it is calculated based on the amount of each fraction collected and the operating time, using the reflux ratio V=L+D. Also note the processing capacity achievable with a tower diameter of 60 cm
If laypeople can understand distillation just by reading a post, then there’s no need for the field of chemical engineering at all