A new member is seeking help with this issue, which has been bothering me for a long time. Everyone is welcome to participate in the discussion
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At 3.0 Mpa, there is 1000 Nm3 of feed gas containing 90% CO2; this feed gas contains saturated water. In order to prevent the feed gas from freezing at 0°C to -15°C, an appropriate amount of methanol must be added to it. What is the method for calculating the amount of methanol that needs to be added? I hope everyone will engage in active discussions; experts are also welcome to help solve the problems. Waiting online,,,
Some data indicate that the freezing point of a methanol aqueous solution corresponds to the amount of methanol present, but is it affected by carbon dioxide gas?
There’s no impact. Check whether it has an effect on the subsequent system; you can refer to the amount and method of methanol addition used in the low-temperature methanol washing process in the purification unit. This technology has been in use in low-temperature methanol washing units for a long time now
Thank you for your answer. Methanol is added in the low-temperature methanol washing unit to prevent water from freezing and to remove water from the feed gas; a relatively large amount of methanol is used. However, in the presence of carbon dioxide gas, carbon dioxide and water also form hydrates in a crystalline form (the conditions for hydrate formation are met under these circumstances). The addition of methanol inhibits the formation of such hydrates; therefore, it is not possible to consider the methanol aqueous solution in isolation. As a result, it is difficult to determine the amount of methanol to use in this system. .
It’s not necessarily the case. In my low-temperature methanol washing process, there’s about 50% CO2, and the amount of methanol used is around 0.3 cubic meters. I hope this helps