Gas-Gas separations

[Icedtee]

Hi, I'm wondering if anyone knows any companies/technologies that can separate Gases - specifically CO, CO2 and CH4.

Thanks

 

[MortenA]

What kind of volumes are you talking about

If you want to remove CO/CO2 from NG then an amine unit is the normal way.

For smaller volumes maybe membranes could be attractive - or certain chemical reactions.

Best regards

Morten

 

[Icedtee]

It would be a gas stream of volumes in the range of say, 100,000-200,000 per day. I'm interested primarily in removing H2 and more importantly, CO from CO2 and CH4.

THx

 

[mbeychok]

Icedtee:

"100,000 to 200,000 volumes per day" is meaningless. Are your volumes expressed as cubic feet, cubic meters, liters, cubic inches, cubic centimeters, or what?

Your original post asked about separating CO, CO2 and CH4. Your second post asks about removing hydrogen (H2). Exactly what are all the components of your gas mixture and exactly what do you want to separate from the mixture?

Take your time and give us all the details and a complete explanation of what you want to do.

Milton Beychok
(Visit me at www.air-dispersion.com)
.

 

[Icedtee]

Sorry, completely forgot to add the units. Its in cubic meters per day.

I've got a gas feed consisting of CO, H2, CH4, CO2 and C2H6 and i'm looking to separate out CO and H2 for a recycle loop in my process - although i'm more interested in the CO than the H2. The % of the components are approximately 25%CO, 10% CO2, 5% CH4, 1% C2H4, balance H2)
The feed will range from 100,000-200,000 cubic meters per day.

The feed is pressurized (~1200psig) and at room temperature although bringing it to standard conditions isn't a problem. I've heard membranes may be one solution although i don't know much about it. Pressure swing adsorption could be another possibility. Are these my only options?

Thanks for all your help.

 

[MortenA]

Your mix sound like synthesis gas?

Amines wont remove the H2 - but will remove the rest.

Best regards

Morten

 

[Icedtee]

Yes, the majority (70-90%) is syngas. Its partially reacted syngas which is to be recycled.

 

[sshep]

Icedtee,

You need to include cryogenic seperation in your alternatives. Cold boxes are used to make syngas seperations of H2, CH4, and CO. The CO2 probably has to be removed in an upstream step (amine wash). A simple inquiry to

http://www.airliquide.com/en/our-offer/engineering-2.html

can probably steer you in the right technology direction.

best wishes,
sshep

 

[dcasto]

Membranes could be used for a gross cut and then the other processes.