Problems with fusel oil removal in the atmospheric pressure column of methanol distillation

3 layers of packing at the top and 30 layers of trays at the bottom

For the fusel oil extraction point in the atmospheric pressure column of methanol distillation, a lower extraction point should be used at the beginning of the production of methanol synthesis catalysts, while a higher extraction point should be employed later in that process. This is mainly due to high operating temperatures in the later stages of use of the methanol synthesis catalyst, as well as a high content of fusel oils in the crude alcohol. In practice, it can be determined based on the ethanol content in the denatured alcohol product and the operating temperature at the point where the fusel oils are extracted.

I would like to ask what the specific operating temperature parameters are for the fusel oil extraction process?

There is no specific temperature requirement for the extraction of fusel oil; the temperature within the tower changes depending on the temperature at the bottom of the tower and the alcohol content present in it. For greater precision, analyze the fusel-like substances at each sampling port separately; open the valve corresponding to the port with the highest level of such substances.

There are 6 extraction points for removing fusel oils in the atmospheric pressure column used for methanol distillation. Which extraction point should be used at the beginning and end of production? What is the basis for making this choice? How can it be determined in practice? Experienced professionals can provide guidance. I usually use three-column distillation; after normal startup, only the middle column is in operation. The specific control methods depend on the requirements set by the process parameters, such as controlling moisture and ethanol levels, and making appropriate adjustments to the line used for extracting fusel oils. 1. In the initial stage of production: One distillation unit is sufficient, as the load is relatively low and the concentration of fusel oils is not high. The extraction rate can be set a bit lower; by doing so, after multiple rounds of distillation, the concentration of fusel oils increases, resulting in less waste of methanol. Later stage: The opening can be increased moderately, as requirements for the levels of ethanol and moisture exist. 2. Basis for selection: Control of requirements for various process parameters, such as the specifications for pure methanol (ethanol and moisture content) and the control of alcohol content at the bottom of the tower. 3. Judgment: Analysis of the purity of pure methanol, the components of water at the bottom of the tower, and fusel oils.

Oh, I learned it! :victory:

Oh, I learned it! :victory:

Could you explain why this was done? What are the specific reasons? ? ?

Banzhu is really great! Hits the mark!