Question about crude methanol concentration
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I would like to ask an expert: After passing through the condenser, the gas phase coming out of the methanol synthesis tower undergoes gas-liquid separation, with the gas phase returning to the synthesis tower while the liquid phase is sent for separation and purification. What is the concentration of methanol in this liquid phase?
The data varies depending on the process used; if methanol is produced from natural gas or coke oven gas, the alcohol content is likely to be lower, around 80% perhaps. If it is produced from coal, the alcohol content is probably around 90%
We produce methanol from natural gas; generally, the crude methanol contains 20% water and 80% methanol. The figures may vary slightly, but not by much.
Our factory produces methanol from coke oven gas, with the mass fraction of methanol in the crude methanol being around 82%.
We produce methanol from acetylene exhaust gas; the methanol content is 80%-83%
For methanol produced from coal, the purity can exceed 90%, while the purity of methanol derived from natural gas is generally around 80%
This is mainly related to the ratio of carbon dioxide to carbon monoxide in the feed gas; the more carbon dioxide there is, the more water is present in the crude methanol, and thus its density increases.
The crude methanol produced by the synthesis of methanol from coke oven gas has a purity of around 80%
Coal-based methanol contains approximately 92% alcohol, while methanol produced from natural gas has a higher proportion of light components, at around 83%; this is for reference only!
In methanol production from coke oven gas, the concentration of crude methanol is 78–80%; in methanol production from natural gas, the crude methanol concentration is generally around 77–80%
Personal opinions, operational issues, gas composition, catalyst activity, etc. All of them can affect the concentration of crude methanol.