[Gasification] Syngas on Wiki_

[Leland T Taylor]

CO2 may interfere with the catalysis. CO2 to methane requires H2 the right catalyst and high temperature, don't remember, but up there.
Tom Taylor



-- Sent from my Palm Pixi
On Dec 28, 2010 5:56 PM, GF <gfwhell at aol.com> wrote: 






Tom,


 


What effect is produced if nitrogen were substituted by CO 2 in the Fischer Tropf process?


I know steam is cracked into O+H2, What sort of temperatures are required to convert  CO2 into methane?


 


HAPPY NEW YEAR


 


GF











-----Original Message-----

From: LINVENT at aol.com

To: gasification at bioenergylists.org

Sent: Tue, Dec 28, 2010 6:59 pm

Subject: Re: [Gasification] Syngas on Wiki_





I believe that syngas is specific to the application, and is based on the 
ratio of hydrogen to carbon monoxide. As an example, ammonia syngas as 
defined in flow sheets for an ammonia plant is 3H2:1N2. Syngas for FT
reactions 
can be from .6H2:1CO-1.5H2:CO, with iron based catalysts requiring less H2 
than cobalt catalysts because the iron catalyst will do it's own shift 
reaction. Produced gas, water gas, blue gas, low heating value gas, low CV
gas are 
all more appropriate designations for air based gasification systems. Even
an 
oxygen or steam driven gasification system will not produce a "syngas" 
appropriate for certain catalyst reactions, but will work for many. 

The use of nitrogen in the gas is indeed done in some of the more 
sopshisticated catalyst systems because it reduces the thermal concentration
in the 
typically exothermic reactor such as FT reactions which in turn reduces the 
amount of cooling needed for the reactor design which can be a significant 
effect. 

The use of the term "syngas" is inappropriate for any gasification system 
because it is a specific composition based on the catalyst used. Only syngas

can be called this when it is cleaned, balanced for the catalyst with 
contaminants removed such as Cl, S, organics so that the catalyst is not
damaged 
by it. 



Sincerely,
Leland T. "Tom" Taylor
President
Thermogenics Inc.
505.463.8422
www.thermogenics.com
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