Reduce the methanol content in the carbon dioxide product gas in the methanol wash process
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In the methanol washing process, the methanol content in the carbon dioxide product gas remains above 200 ppm, which has a significant impact on the downstream dehydrogenation unit. What measures can be taken to reduce this level?
If modification or the addition of equipment is not desired, considerations can be made from the aspects of process parameters: increasing pressure and reducing temperature
Wash with deionized water, increase pressure, and control flow rate
A high methanol content in the product gas CO2 can affect the deep hydrolysis in the urea plant. Is the design of the internals in the methanol wash flash tower reasonable?
There is a wash tower that uses desalinated water for washing in order to recover methanol. I don’t know if your process includes such a washing tower.
Yes, normally there is such a water washing tower; it’s necessary to check whether the pressure and temperature are appropriate. If such a tower is present, it’s also important to verify that its internal components are in good condition and that the flow rate of the desalinated water used for washing is sufficient