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mrunal
Active Contributor

Join Date: Jul 2008
Posts: 21

coalescent filter and hydrocarbons

05/11/2009 9:20 PM

Application: We are taking a sample of natural gas that comes out while drilling on the drilling rig. This sample is sent to a gas chromatograph and we are trying to detect and measure the first 5 hydrocarbons - Methane, Ethane, Propane, i-butane and n-butane.

Question: In order to remove the moisture, can I use a coalescent filter? Coalescent filter removes oil and water, but will it remove the lighter hydrocarbons as well. I am planning to use a coarse filter and a fine filter. What would be the recommended element size? Will 1 micron filter (for fine filter) remove the lighter hydrocarbons?
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Anonymous Poster
#1

Re: coalescent filter and hydrocarbons

05/13/2009 10:24 AM

Hi

First you need to know to what level of dryness you need for your sample, is expressed in temperature Deg.(related to dew point PDP), I assume that the 3deg C would be ok than you can use a refrigerant dryer, the coalescent filter is for oil particle and big water particle and will not affect the chemical composition (is a mechanical filter made of a fine foam cartridge or paper cartridge with different kind of filtration level eg 0.01 or 0.001 micron all chemically inactive).

If you need very dry (-30 to -40 C) sample a Desiccant dryer or a membrane dryer will be your next option.

Hope this helps
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mrunal
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Join Date: Jul 2008
Posts: 21
#2
In reply to #1

Re: coalescent filter and hydrocarbons

05/16/2009 12:28 PM

Thanks, good to know it won't affect chemical composition of sample!
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