hydrogen-to-carbon ratio
Thread Content
Is the hydrogen-to-carbon ratio for methanol synthesis calculated based on the composition of the gas entering the synthesis tower, or based on the composition of the fresh gas after conversion? Additionally, what is the difference between the hydrogen-to-carbon ratio of conversion and that of methanol synthesis?
The value of 2.05–2.15 refers to the fresh gas; only by meeting this value can the methanol synthesis reaction proceed properly. Generally, the gas entering the synthesis tower has a value of over 3, mainly to suppress side reactions such as wax formation and ethanol formation.
The gas entering the synthesis tower is a mixture of fresh gas from the conversion process and recycled gas that has not reacted yet and comes out of the synthesis tower. In our plant, if we use syngas to determine the hydrogen-to-carbon ratio, it should be around 5
Usually, we are referring to fresh gas, but in practice, the inlet gas cannot generally be monitored immediately; therefore, the process is adjusted by using recycled gas. The circulating gas is more operable, with a value of around 3-5 per shift.
Using the actual hydrogen-to-carbon ratio fed into the tower to guide production is practical.
What is the impact of increasing the hydrogen-to-carbon ratio on compressor operation?