Alcohol content in the gas entering the tower
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The three-stage inlet of the methanol synthesis gas compressor is composed of synthesis cycle gas and conversion fresh gas. The methanol content in the circulating gas is 0.04%, which is quite low; however, the alcohol content at the outlet of stage 3 (that is, the gas entering the tower) is 0.17%, which is relatively high. I’ve checked various things but haven’t been able to determine the reason. Does anyone else experience a similar situation and know what the cause might be?
Check whether there are leaks in the heat exchangers at the inlet and outlet of your synthesis tower; or there may be an issue with the analysis. If it’s caused by the effect of vent gas, the impact wouldn’t be this severe
The methanol content in the gas purified by low-temperature methanol washing can be analyzed to determine whether the analysis is accurate.
After pressurization, some of the methanol liquefies, resulting in a higher pressure at the compressor outlet than at the inlet!