Biogas scrubbing
Biogas scrubbing
(OP)
Can I scrubb CO2 out of biogas in normal athmosphere pressure? Or is it waste of time...?
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RE: Biogas scrubbing
Well, all depend on the flow of biogas that you will have for treatment and the percentage of co2, but if it is a significant quantity of biogas, and co2, I am sure you will prefer to use some pressure, maybe a lot.
Other thing is the liquid you wish to use for the treatment, and of course the final use of the biogas.
RE: Biogas scrubbing
Liquid used for scrubbing is pure water or water with lime stone (or some other suitable stuff).
RE: Biogas scrubbing
Use the methane to fire a heater or something else which doesn't care so much about the CO2 that comes along for the ride.
RE: Biogas scrubbing
RE: Biogas scrubbing
RE: Biogas scrubbing
RE: Biogas scrubbing
For small production of biogas the most economical option will be membranes. You can go to a 98% CH4 (Nm3) and you will have a low percentage of water.
RE: Biogas scrubbing
RE: Biogas scrubbing
1. moltenmetal told you the economical option. To use biogas for cogeneration.
2. You said that it is for the production of vehicle-quality biogas, so I suppose that you need, more or less, CO2<2%, H2S<50ppm and H2O dew point<0ÂșC
3. If you are with the CH4/CO2 separation, I suppose that the H2S and H2O are not a problem at this point.
4. Here http://www.uop.com/gasprocessing/6010.html you can find an option for this separation with membranes.
5. Expensive? I really don't know. Sorry. But I am sure it is less expensive that a distillation or a scrubber in fixed capital and in operation.
6. If you want to see more options, you can see the Michelle Aresta book Carbon dioxide recovery and utilization
I hope you will find this information useful