Analysis of the high ethanol content in crude methanol
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Reasons for the high ethanol content in crude methanol: 1. Poor quality of catalysts, resulting in low selectivity. 2. The local temperature in the synthesis tower is high. 3. The reaction pressure in the synthesis tower is low (partial pressure is low). 4. The fresh gas H/C ratio is low. 5. The CO content in the gas entering the tower is high (over 18%). 6. The CO2 content in the fresh gas is below 0.5%. 7. Low air velocity.
9. Debris in the pipes, such as metal shavings. 10. Impurities in the fresh gas, such as carbonyl compounds.
The control of ethanol content is mainly achieved through the control of the atmospheric pressure tower
Is the ethanol content high in crude methanol? How much is considered high? Everyone is welcome to discuss
This can be dealt with at a low cost. We need
Can this be dealt with at a lower price? . We need: P:P:P
If the catalyst has not yet aged, the synthesis reaction temperature and the carbon dioxide content in the feed gas have a significant impact. For copper-based catalysts, the temperature can be set according to the range recommended by the catalyst manufacturer. As for a carbon dioxide concentration of 0.5%, this seems a bit low; increasing the carbon dioxide concentration appropriately can help to reduce the formation of by-products The exit temperature of our synthesis tower is 220 degrees Celsius, with a carbon dioxide concentration of around 2.5%. Everything has been operating normally for almost two years; the catalyst has not been replaced, and the parameters of the crude methanol are within normal ranges
Gas composition entering the tower: H2 82.72%, CO 4.57%, CO2 3.21%, CH4 8.95%, N2 0.11%, H2O 0.03%, CH3OH 0.41% – Heat-wall quench type ICI synthesis tower
Will the ethanol content in this gas composition be high?
Practical analysis has shown that increasing the hydrogen-to-carbon ratio can effectively reduce ethanol production.
The last edit to this post was made by Small and on 2017-9-12 at 23:50. Ethanol is a by-product, and there are many reasons for this; it’s the result of various factors such as catalyst aging, low carbon dioxide levels, reaction temperature, etc. Increasing the carbon dioxide level can help prevent the formation of ethanol as a by-product