The purity of the purified CO2 product gas is low
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This post was last edited by sxtblo on 2012-2-7 at 16:00. What should be done if the purity of carbon dioxide produced by low-temperature methanol washing is not sufficient? That is, what are the reasons for such issues?
The purity is not sufficient; is there an analysis of what components the magazine consists of? If the impurities are things like nitrogen, then it must be that there is a leak in the nitrogen pipeline. Under normal circumstances, the carbon dioxide product tower in the low-temperature methanol washing process does not suffer from insufficient purity – only issues such as low production volume or excessive sulfur content may occur. This is because the carbon dioxide product is obtained by absorbing methanol and then releasing it, so there shouldn’t be many impurities present.
An insufficient CO2 purity indicates a problem with the medium-pressure flash evaporation; the CO+H2 content in the CO2 gas is high, and in such cases it is sufficient to reduce the pressure in the medium-pressure flash evaporation tank accordingly!
1. High or fluctuating medium-pressure flash pressure leads to incomplete flashing of hydrogen and carbon monoxide in methanol, resulting in high levels of CO and H2 in the CO2 gas. 2. Low water volume used for conversion washing causes an increase in ammonia content in the methanol being washed, as well as high ammonia levels in the CO2 gas
It’s due to insufficient flashing; reducing the flashing pressure is important, and it’s also crucial to control the circulation rate properly
A sample should be taken to determine which components have increased. If sulfur levels are too high, the amount of carbon-rich methanol fed in should be increased; if the pressure in the flash tank is high, appropriate adjustments can be made. Each issue needs to be analyzed on a case-by-case basis.
Sampling for analysis should be carried out; the reason for the low purity of most carbon dioxide is likely an excessively high control level of the medium-pressure flashing pressure, which prevents gases such as hydrogen and carbon monoxide present in the carbon dioxide-rich methanol from being completely flashed away, resulting in insufficient purity. You can pay close attention during production!
Is what you wrote correct? What should we do if our CO2 levels are too high? How is it that you still aren’t enough!? Could you explain it to me in detail? Thank you, senior brother
This post was last edited by Li Chunyang on 2012-5-13 at 18:13. Could you provide me with detailed information on this topic? What is the impact of low CO2 levels on purification? Aren’t we trying to remove CO2?
To find the root cause, it should be a problem with the distribution of the methanol that is absorbed, that is, there is an issue with the distribution of the amount of methanol circulating. Additionally, there is a problem with the amount of methanol that is reabsorbed