You might start with looking into some of the natural gas processing steps (Claus-process, sulfinol-process etc) as a starting point.

Regards

Stefan

If you can run the gas through an amine system that uses something like TGA, that will reduce both the H2S and CO2 levels.  If you must treat the condensate (I am assuming this is mostly water), then you will either need to treat it by stripping the dissolved H2S and CO2 with a gas such as nitrogen.  If stripping is not feasible for your situation, then the type of treatment is going to depend upon the concentrations of H2S and CO2 in the condensate and the type(s) of secondary treatment that are feasible for the volume of condensate that must be treated as well as the allowable levels in the final product.  For low concentrations, running the condensate through a solid bed of something such as activated carbon or iron oxide powders.  For higher concentrations of H2S, you may need to first use an oxidizing chemical to react it to elemental sulfur and then filer out the colloidal sulfur.  Removal of the CO2 could be done by increasing the pH with something such as MEA or NaOH to react it out to form bicarbonate.

So, the choice of treatment is going to depend upon whether you can treat the fluid as a gas or a liquid, the concentrations of H2S and CO2, the volume of fluid that must be treated and the specifications for the treated product.

thank you for the suggestions. The steam is coming from an isokinetic probe but the CO2 and H2S is inherent in the geothermal steam so that when you condense the steam for liquid sampling part of the CO2 and H2S goes with it.  We need to optimize the temperature like collect a condensate at or near 40 degrees celsius wherein most of the Non-condensible gases is at the gas phase and we'll probably need an efficient gas liquid separator to do it...  Chemical means would  be quite costly.  Do you have any idea about an efficient mechanical degasser?  Cheers.

This two references might helpful:

Ármannsson, H. and Ólafsson, M., 2006: Collection of geothermal fluids for chemical analysis. ÍSOR, Reykjavík, ÍSOR, report ISOR-2006/016, 17 pp.

and: www.os.is/gogn/unu-gtp.../UNU-GTP-2006-09.pdf

Regards

Stefan

If chemical removal of the CO2 and H2S is not feasible, then that leaves a stripping column where you use a clean gas such as nitrogen or methane to remove the CO2 and H2S from the condensate.  The only catch here is that if there is ANY oxygen content in the nitrogen, the oxygen will very rapidly react with the H2S to form suspended elemental sulfur colloids that you are not going to be able to filter from the condensate.  There is also the issue of properly disposing of the contaminated stripping gas.  How you dispose of it depends upon the volume that you must use and any local regulations on the discharge of H2S and/or SOx species.  The selection of the stripping gas also plays into this decision.

I've read somewhere that Acrolein can be used as a H2S scavenger.  Do you have any idea of its application?