Selection of tray for extracting fusel oil in methanol distillation

Generally speaking, when natural gas is used as raw material to produce methanol, the fusel content is not so much, so the output is not very large, and the relationship between the three plates is not very big. However, when coal is used as raw material, the fusel content and types are generally more. You can consider doing a full analysis of crude methanol to see the contents of ethanol, propanol and butanol. Generally, the higher the heavy bomb content, the lower the extraction position. But in fact, for a chemical enterprise, if the amount of fusel is not very large, three plates can be extracted at the same time to ensure the quality of refined methanol in the atmospheric tower.

As for the conditions of mining, you can refer to two bases: First, the temperature of the sensitive plate of the rectification tower you are operating, and if the temperature rises obviously, you can consider mining. The other is the analysis of your refined methanol, especially the analysis of boiling range. If the boiling range is a little out of the standard, the reason for the excess is the high final boiling point (so-called high point), then we can consider extracting fusel oil.

In practice, intermittent mining is generally adopted. Discontinuous, unless the quality of crude alcohol is poor.

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