CO2 REMOVAL from syngas

[reihane1]

Dear All,

I want to find best solution for co2 removal of syngas. I have found several documents in this result.But for a better descitio my boss needs to know different solutions which are used around the world.Also I want to know is k2co3 used currently in this regard or nowadays just Amine solutions are used?Beside I want to know which amine is the best

thanks

 

[maddocks]

This is a huge topic that is probably far too big to be discussed on a forum. Suggest you start an extensive google search - there's a lot of papers out there and the technology is improving rapidly. Look at some carbon capture forums, talk to Siemens, Hyundai, Alstom, BASF, and some of the other big boys for carbon capture. There's more to this than just amines. In theory, you could simply select a primary amine, but the oxygen degradation, reboiler duty, and vapour pressure will make this a difficult choice.

 

[reihane1]

Dear maddocks,
Thanks for your reply.I know this is a huge topic.But It is obvious that there are some rule of thumbs in this regard.For Example I know that now adays more new plants use BASF activated MDEA.I want to know effective parameter.Besides
I thinks it is common to use specific type of Amine for Syngas units.Please guide me or refer me to some useful documents.
Best

 

[dcasto]

Amines are selected based on the available gas pressure, gas temperature, exact composition and contractual obligations. MDEA's are preferred because they have the ability to slip CO2 while getting all the H2S. If your syngas has no H2S you can simply bypass the treater with some gas and blend to meet the contract specs.

If the CO2 is real high, no amine will work in a simple process step because of the extreme heats of reaction. At high CO2 concentrations physical solvents work much better. Sulfinols, propylene carbonates are among the ones used. Membranes are often used to do rough cuts also.

Contamination with such things as O2 raise issues with irreversible degradation of amines.

DEA will not work well unless the pressure is over 180 psig. MDEA also has a low pressure limit, whereas DGA and MEA work at low pressure.

Are you getting the picture on how big the topic gets.