4 replies to this topic

[shamsoddin 1989]

Hi everyone,
I am new to this forum and also new to the chemical engineering topics. So I would like to apologise in advance as my question may sound funny.
I am going through a nature paper and want to figure out the order of reaction of carbon degradation. It is a nature paper called "Rapid microbial methanogenesis during CO2 storage in hydrocarbon reservoirs". Although I know that the methanogenesis process is a first order reaction, I want to know how to figure out the rate of reaction. In summary, the carbon dioxide was resting in the reservoir for 29 years and in 2015, the assessment shows that 1.15-1.72*10^7 m^3 (STP) of methane has been produced and the minimum rate of CH4 production was 73-109 mmol/m^3/yr.

I would be grateful if anyone can help me figure out the question. For your further information, the link to the paper is 

https://www.nature.c...586-021-04153-3.

With kind regards

Shams

[SilverShaded]

Interesting problem.  My understanding of methanogenesis, which is very limited i should warn you, is that there needs to be an energy source to supply the energy required for conversion of CO2 to Methane and water.  In an oil resevoir is that energy source untapped hydrocarbons?  Calculating a rate of reaction to me would seem rather difficult for this problem, but i could be entirely wrong.  Would it depend on available energy containing material, density of microbes, temperature, pressure etc...  I would think using laboratory data would be the best way to attempt such a calculation.

Just some random thoughts, hope someone more knowledgable can help you.

 

There is probably not enough information in the paper to attempt it.

Edited by SilverShaded, 09 February 2023 - 11:08 AM.

[latexman]

Have you had a course in chemical reaction kinetics?   Determining the order of a reaction is critical to the successful scale-up and commercialization of any chemical process.  It is one of the responsibilities that makes a chemical engineer somewhat unique from other engineers.

[shamsoddin 1989]

Thanks Latexman and SilverShaded for your response to my question.

I have a general understanding of the kinetics of reaction and was looking for a way to better understanding of them.

Just came up with another question which is quiet tricky.

I am currently investigating papers and want to know the order of reaction of hydrogen dissipation. Most of the papers use the Monod or Michaelis menten method. Just want to know if it would be possible to convert these results in a way to the first order and know about the reaction constant and rate. Since I have to model the reaction in first order and I could not find data for that, I thought that it might be the best way to convert the results for Monod and Michaelis Menten to First order.

Is it possible to do it and if yes, how?

[breizh]

Hi,

You may find pointers in the document within this link:

https://www.research...ormation_Models

 

Good luck

Breizh