Can all the off-gases in methanol synthesis be recovered?
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Can all the off-gases in methanol synthesis be recovered?
Reply 1# zeng46563: It shouldn’t be possible, but it’s feasible to recycle more reasonably
Once the inert gases in the off-gas are fully separated, they can be utilized completely, but can pressure swing adsorption technology achieve this?
All of the hydrogen can be recovered, and it’s best to remove all inert gases
The useful hydrogen gas in the methanol synthesis off-gas can be recovered through membrane separation; after being pressurized by a hydrogen compressor, it is returned to the fresh gas pipeline to continue methanol synthesis, while the remaining gases are sent back to the fuel gas network. If all is recycled, the investment cost is high.
Pressure swing adsorption has a higher hydrogen recovery rate than membrane separation, and the remaining portion can be used as fuel gas.
It can all be recycled! But it depends on what you do with what you recycle! If it’s not very useful, there’s no need to recycle it all! But it can be selectively recycled or utilized!
Methanol off-gas can be fully recovered and used again as a feedstock for pressure swing adsorption; the hydrogen obtained through separation has a purity of 99.99%. It can also be used as a hydrogen source for coal tar hydrogenation in subsequent processing steps, and can be packaged for sale as well.
I would like students from Zhengzhou University to share how they do it. I have been in the industry for six years, and still, a large portion of what we use gets burned; very little is recycled or reused.
If it is a monol, the hydrogen in the off-gases can be recovered; if there is ammonia synthesis, the ammonia can be recovered as well. If you want to recycle everything, that’s possible as well, but the cost is too high. Generally, only the useful components are recovered.
Classmate, I think your formulation isn’t precise enough; moreover, your wording is too academic. The methanol in the exhaust gas is now mostly recovered, and most of it is removed before hydrogen is recovered – it’s nothing complicated or mysterious.