[Gasification] Gasification Digest, Vol 19, Issue 10

[Art Krenzel]

Mark,

DuPont and I hold patents for the separation of helium from natural gases 
using permeation though the walls of hollow micro-fibers.  In four stages of 
concentration, we concentrated helium from 0.25% to 99.995% using Dacron 
fibers.  The tests were done in the oil fields about 60 miles north of 
Amarillo in a pilot plant that had been constructed inside a 40 ft van 
trailer.  We achieved our concentration goal at midnight on Christmas Eve in 
1965.   It was an easy date to remember.

Art Krenzel

----- Original Message ----- 
From: "Richard Haard" <richrd at nas.com>
To: "Discussion of biomass pyrolysis and gasification" 
<gasification at listserv.repp.org>
Sent: Saturday, January 12, 2008 10:11 PM
Subject: Re: [Gasification] Gasification Digest, Vol 19, Issue 10


> In extraction of helium from natural gas they use teflon membranes or
> filters to separate this element from the more massive methane
> molecules. I believe though there is a patent in this application.
> On Jan 12, 2008, at 9:40 PM, Mark Ludlow wrote:
>
>> Andy,
>>
>> Andrew is most often spot-on in his replies but your question got me
>> thinking. The reason that your hydrogen left your balloons was that
>> 1.) its
>> molecular radius is so small that it easily traversed the broader
>> molecular
>> matrix of your latex balloons and it headed toward a lower pressure
>> (lower
>> H2 partial pressure) destination.
>
>
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