Range of hydrogen-to-carbon ratio in the raw gas used for methanol production in industry
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In the industrial production of methanol, after the raw materials are purified and transformed, what is the range of the hydrogen-to-carbon ratio in the gas? What is the effect of the hydrogen-to-carbon ratio of the gas entering the methanol synthesis reactor on the product?
It is advisable to keep the ratio of (H2—CO2)/(CO+CO2) at 2.05 – 2.10 in syngas; a slight excess of hydrogen can facilitate the reaction better. (1) CO + 2H2 → CH3OH + Q (2) CO2 + 3H2 → CH3OH + H2O + Q Gas concentration affects the conversion rate
For the recycle gas compressor, it is advisable to keep the hydrogen-to-carbon ratio of the fresh gas between 2.05 and 2.15. As can be seen from the methanol synthesis reaction equation, an appropriate hydrogen-to-carbon ratio plays a crucial role in the yield of methanol. The hydrogen-to-carbon ratio is optimal, catalyst utilization is high, equilibrium conversion increases, product by-products are reduced relatively, and output increases ； If the hydrogen-to-carbon ratio is out of balance, it can lead to a deterioration in the reaction, an imbalance in the bed temperature that is difficult to control, an increase in by-products, and an increase in the synthesis off-gases – all of which are problems.
Thanks for the answer from above! If the hydrogen-to-carbon ratio of the fresh gas is maintained at 2.05–2.15 without change for an extended period, will this affect the catalyst utilization rate and the equilibrium conversion rate? How long does it take to make one adjustment?
The catalyst utilization follows a pattern from low to high to low; the catalyst does not affect the equilibrium conversion rate, but rather influences the speed of the conversion process. As the catalyst activity decreases, more by-products are produced.