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#1
06-02-2008, 02:47 AM
 srd_2111 Guest Posts: n/a
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?
#2
06-02-2008, 03:43 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: H2S % to ppm conversion

Quote:
 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 )
#3
11-21-2011, 02:50 AM
 Unregistered Guest Posts: n/a
Re: H2S % to ppm conversion

H2s from mg/nm3 to ppm ,0.1
#4
03-08-2012, 04:39 PM
 Unregistered Guest Posts: n/a
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
#5
03-09-2012, 02:57 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: H2S % to ppm conversion

Quote:
 Originally Posted by Unregistered 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.
#6
03-09-2012, 07:08 AM
 Unregistered Guest Posts: n/a
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!
#7
03-09-2012, 11:27 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: H2S ppmv to mol% conversion

Quote:
 Originally Posted by Unregistered 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.
#8
03-09-2012, 05:15 PM
 Unregistered Guest Posts: n/a
Re: H2S ppmv to mol% conversion

Quote:
 Originally Posted by JohnS 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?

-----------------------------------
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%
#9
03-09-2012, 05:32 PM
 Unregistered Guest Posts: n/a
Re: H2S ppmv to mol% conversion

Quote:
 Originally Posted by JohnS 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
#10
03-10-2012, 02:16 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: H2S ppmv to mol% conversion

Quote:
 Originally Posted by Unregistered 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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