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food grade vs. industrial co2

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Post Thu Feb 22, 2007 4:36 pm

food grade vs. industrial co2

Is there a real difference between food grade co2 and industrial grade? And do places like welding supply shops carry the food grade stuff?



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Master Brewer

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Post Thu Feb 22, 2007 5:33 pm

It's all the same comes out of the same tank, don't worry just use it.
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Master Brewer

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Post Thu Feb 22, 2007 9:26 pm

it's not all the same. With food grade CO2 both of the Os are on the left side, and industrial grade they are on the Right side, so you see there is a fdifference after all. :P
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Master Brewer

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Post Fri Feb 23, 2007 12:11 pm

a google search brought up:

Purification of carbon dioxide
Document Type and Number: United States Patent 6099619
Link to this Page: http://www.freepatentsonline.com/6099619.html
Abstract: Industrial grade carbon dioxide may contain unacceptable amounts of sulfur-containing materials, oxygen, and organic materials particularly detrimental to food-related uses of carbon dioxide. These can be effectively removed by a bed of silver-exchanged faujasite and an MFI-type molecular sieve. This permits an on-site, on-demand method of purifying carbon dioxide ranging from laboratory to tank car seals.

That's not to say that most CO2 ISN'T food grade, but it's just what I found. I wasn't able to come up with specs for industrial grade co2.

If you contact the gas supply company, they would be able to get the specs for you. They are actually required to be able to provide the specs in the form of an MSDS.
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