What are the effects of the hydrogen-to-carbon ratio on methanol synthesis?
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What are the effects of a low hydrogen-to-carbon ratio on methanol synthesis? The hydrogen-to-carbon ratio of the synthesis and purification gas for coal-based methanol production is generally required to be 2.05–2.15, with carbon dioxide content required to be 2.0–3.0%. What problems will occur if the hydrogen-to-carbon ratio is operated below 2.0%?
The methanol yield is highest when the hydrogen-to-carbon ratio is 2.0–2.05. When the hydrogen-to-carbon ratio is between 1.95 and 2.0, the methanol yield is also relatively high. However, the amount of hydrogen in the synthesis system will gradually decrease, causing the carbon monoxide level to rise over time; it may even exceed the carbon monoxide content in the purified gas, leading to carbon monoxide disproportionation reactions.
During the actual production process, what problems arise again when the CO2 content is below 0.5%?