How to effectively control the acid value of fuel ethanol during distillation
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Our factory specializes in the production of fuel ethanol, but currently the acid value of our product remains quite high. Alkali needs to be added during distillation to adjust this value; however, using too much alkali can lead to problems with the distillation process, making it difficult to control it properly. I was wondering if any experts here could help find a solution to effectively control the acid value. By the way, we use differential pressure three-column distillation technology.
There’s no good solution; try reducing the heating vapor pressure and increasing the reflux ratio! It is also possible to see what kind of acid it is, where it comes from, and whether it can be controlled at the source. Let’s see whether the acid is present in the high-boiling or low-boiling substances. This post was last edited by jukejuke on 2009-2-11 21:39]
2# jukejuke I’m encountering the same problem with my distillation too! My distillation involves raising the concentration of ethanol from around 50% to 95% (V/V); the acid value at the outlet is high, reaching 0.005%. It is also being adjusted by adding alkali now. By the way, what is the height of the weir plates in your distillation tower?
When adding alkali in the crude tower, the dosage may increase, but foaming will not occur.