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# convert from ppmv to ppmw in gas mixture

## convert from ppmv to ppmw in gas mixture

(OP)
dear gents
i would like to know how to convert ppmv to ppmw in gas mixture or any book talking about that equation

### RE: convert from ppmv to ppmw in gas mixture

PPMV in gases is the same a parts per million of moles.  Multiply the componets in the gas stream by their molecular wt.  This will give grams (or pounds or weight whatever your point of view is).  Sum up all the weights and get the mass.  Take each componet mass divided by total mass to get coponet fraction including ppm wt.

OR  take the total stream average mole wt and get the total mass of the stream (you can also use spgr).  Then take the mole wt of the componet that you want to find ppmwt and multiply by its mole wt.  Divide the compnet mass by the total mass of the stream.  This is an estimate and works very well for ppm conversion.

### RE: convert from ppmv to ppmw in gas mixture

Tamer123:

Click here ==> FAQ127-1205 to find exactly the equations that you want.

Milton Beychok
(Visit me at www.air-dispersion.com)
.

### RE: convert from ppmv to ppmw in gas mixture

(OP)
dear gents
i would like to know what is the range of turndown ratio for absorber, because normal feed gas rate for a liquefied gas plant is about 700KNm/h3 with amine circualation about 90 M3/h but on start up we have always off-spec co2 in the gas (grater than 100 ppm )that happens with 125 KNm3/h start up feed, absorper is trayed one 20 bubble cap trays

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