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  #1  
Old 06-02-2008, 02:47 AM
srd_2111
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Default H2S % to ppm conversion

For oil / gas industry it is stated as 1 % H2S (Hydrogen Sulfide) = 10000 ppm H2S. Can u tell me the calculation for this?
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  #2  
Old 06-02-2008, 03:43 AM
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Default Re: H2S % to ppm conversion

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Originally Posted by srd_2111
For oil / gas industry it is stated as 1 % H2S (Hydrogen Sulfide) = 10000 ppm H2S. Can u tell me the calculation for this?
"Percent" = parts per hundred.
one million divided by one hundred isten thousand. Both the numerator and denominator of one part per hundred are multiplied by ten thousand yielding 10000 parts per million. (or move the decimal four places )
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Old 11-21-2011, 02:50 AM
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Default Re: H2S % to ppm conversion

H2s from mg/nm3 to ppm ,0.1
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Old 03-08-2012, 04:39 PM
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Default Re: H2S % to ppm conversion

Is there a difference between mole percent H2s and Percent H2s in a gas stream? If I have 9.36 mole percent H2s, what is the percent H2S in gas stream and also PPM in gas stream. Would that be 9360 PPM? Thanks
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Old 03-09-2012, 02:57 AM
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Default Re: H2S % to ppm conversion

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Originally Posted by Unregistered View Post
Is there a difference between mole percent H2s and Percent H2s in a gas stream? If I have 9.36 mole percent H2s, what is the percent H2S in gas stream and also PPM in gas stream. Would that be 9360 PPM? Thanks
Percentages and ppm in gases are normally based on molar ratios (solids are usually mass ratios, liquids may be mass, volume or even mass/volume).

So it is 9.36%; however 1% = 10000 ppm (1% of one million parts), so 93600 ppm.
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  #6  
Old 03-09-2012, 07:08 AM
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Default Re: H2S ppmv to mol% conversion

Mole weight of gas mixture 17.57 g/mol
H2S 20ppm in volume

How much mol % of H2S in the mixture? Thanks!
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  #7  
Old 03-09-2012, 11:27 AM
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Default Re: H2S ppmv to mol% conversion

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Mole weight of gas mixture 17.57 g/mol
H2S 20ppm in volume

How much mol % of H2S in the mixture? Thanks!


20 ppm or 0.002%. By Dalton's Law of Partial Pressures the fraction by molar ratio, partial pressure, or volume would be the same.
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Old 03-09-2012, 05:15 PM
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Default Re: H2S ppmv to mol% conversion

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20 ppm or 0.002%. By Dalton's Law of Partial Pressures the fraction by molar ratio, partial pressure, or volume would be the same.
Just like that? Could you elaborate a bit more?

How about below calculations:
-----------------------------------
Gas Mixture: 17.57 g/mol
H2S: 34.08 g/mol; 20ppm in volume (2E-5)

Per mole Gas mixture = 17.57g
H2S = 2E-5 x 34.08 g = 6.8E-4 g
Mol % = 6.8E-4 / 17.57 *100% = 3.87E-3 % = 0.00387%
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  #9  
Old 03-09-2012, 05:32 PM
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Default Re: H2S ppmv to mol% conversion

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20 ppm or 0.002%. By Dalton's Law of Partial Pressures the fraction by molar ratio, partial pressure, or volume would be the same.
And Dalton's Law of Partial Pressures is only applicable for Ideal Gas. In my convertion, the P & T of mixture is 50 barg and 30C, respectively.

What is the answer then? THX
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  #10  
Old 03-10-2012, 02:16 AM
JohnS JohnS is offline
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Default Re: H2S ppmv to mol% conversion

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Originally Posted by Unregistered View Post
And Dalton's Law of Partial Pressures is only applicable for Ideal Gas. In my convertion, the P & T of mixture is 50 barg and 30C, respectively.

What is the answer then? THX
Since both the mixture and the H2S occupy the entire volume, what does percent (or ppm) by volume actually mean? It customarily is considered to be the ratio of the number of molecular entities hence it is the molar ratio.
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