Help understanding an experiment set up

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Discussion Overview

The discussion revolves around understanding the composition of an inlet mixture in a combustion or pyrolysis experiment, specifically focusing on the mole fractions of isobutene, O2, and N2 as described in a referenced paper.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Homework-related

Main Points Raised

  • One participant seeks clarification on the composition of the inlet mixture, noting the flow rate of isobutene in nitrogen and expressing confusion about the absence of O2 in the combustion context.
  • Another participant requests the reference for the paper being discussed.
  • Concerns are raised about the lack of O2 information in the combustion experiment, suggesting a potential oversight.
  • It is proposed that the paper may actually be discussing pyrolysis instead of combustion, which would explain the absence of O2.
  • A later reply suggests that if the paper is about pyrolysis, the inlet mixture could be assumed to be 50% isobutene and 50% N2.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the nature of the experiment (combustion vs. pyrolysis) and whether O2 is necessary in the mixture. There is no consensus on the correct interpretation of the inlet mixture composition.

Contextual Notes

The discussion highlights a potential misunderstanding of the experimental context, with implications for the interpretation of the inlet mixture's composition. The lack of explicit mention of O2 raises questions about the assumptions made in the analysis.

dRic2
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Hi, I'm reading a paper about combustion and I can't understand the composition of the inlet mixture. Here's what the paper says:

"A known flow rate of the isobutene (Matheson, TriGas, 99.5%) in nitrogen (General Air, 99.998%) was introduced into a 6mm ID quartz reactor that was heated in an electric furnace..."

I need to calculate the mole fraction of isbutene, O2, and N2 but I don't understand the above sentence. Any suggestion would be of great help!

PS. isobutene = isobutylene

PSS: I find very strange that in a combustion experiment is not mentioned the amount of O2 in the mixture... Maybe I'm overlooking something, but I didn't find anything else in the paper

PSS: I forgot an important part: there is a line that says "N2/iC4H8 = 50/50 % mol"
 
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Can you give the reference?
 
dRic2 said:
I find very strange that in a combustion experiment is not mentioned the amount of O2 in the mixture... Maybe I'm overlooking something, but I didn't find anything else in the paper

Check whether the paper is about "combustion" or "pyrolysis".
 
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Lord Jestocost said:
Check whether the paper is about "combustion" or "pyrolysis".
Oh, I'm an idiot...

It says pyrolysis so no O2 is needed, then I assume the inlet mixture is just 0.5 isobutene and 0.5 N2, right ?
 

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