Ok so I wish to try solve a problem at work I will try explain as best I can .(adsbygoogle = window.adsbygoogle || []).push({});

Problem Definition;

Filling of a bundle of cylinders 17 x 50litre ( 850 000 k/m^3). 30 % Co2 in the cyindrical vessal followed by input of Nitrogen 70% to a final pressure of 200 bar

Due to production requirements it is often required to analysis the gas straight away after filling and more often than not the analysis for co2 is reaching only 24 - 26 % which is under spec

If the vessals were left for instance 4 hours then upon anaylsis a reading of around 30% co2 would be found.

.

My thoughts are with the diffusion of the co2 in nitrogen as co2 rate of diffusion is 1.25 to n2 is this causing the co2 to take time to uniformly distribute throughout the vessal.

I would like to know how to calculate the time it will take for the co2 to diffuse in the vessal given the final pressure and temperature of the vessal? if possible

Solution:

My current thought on solutions;

1. Fill a much smaller vessal as well at the same time and use that for analysis since the cylinder will get hotter causing the gases to diffuse quicker.

2. Increase pump speed to increase the temperature of the 17x50 bundle which in turn will increase the rate of diffusion.

3. heat the co2 liquid before it enters the vessal increase the rate of its diffusion once inside the vessal

Any help and advice ie am I on the right track please

thanks

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# Diffusion of Co2 in Nitrogen

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