Liquid and Compressed Carbon Dioxide (CO2)

We commonly know carbon dioxide (CO2) as something produced from combustion, as an integral component of photosynthesis, a plant’s ability to transform carbon dioxide and water to glucose and oxygen in the presence of light, and the stuff that provides “carbonation” to soft drinks, beer and sparkling wines.

But where does purified carbon dioxide start? With all the attention around climate change and the responsibility carbon dioxide has in that process, you might think that atmospheric extraction would be the easiest way to do it. Surprisingly, atmospheric levels of carbon dioxide average less than 450 parts per million, making that process not the best way to get the job done and cos too much money to provide any value. Likewise, natural fermentation may work in a wine bottle and brewing tank, but that process doesn’t have much upscale potential. No, mostly all the purified carbon dioxide that is on the market today is a byproduct of chemical manufacturing, oil refining and natural gas purification.

Carbon dioxide is a colorless, odorless, nonflammable slightly acidic gas and, because it is available on such a large scale, has many uses in a variety of industries. The food industry uses CO2 in food freezing, carbonated beverage manufacturing and modified atmosphere packaging. Carbon dioxide is regarded as an “active gas” in shielding the arc in gas metal arc welding (GMAW / MIG welding) either by itself or in mixtures of argon and helium. Its acidic properties mixed with water make it a good water treatment additive for pH control. Liquid Carbon Dioxide is also expanded in specialized equipment to generate “dry ice” blocks and nuggets used for temporary refrigeration.

Higher purities of carbon dioxide, from Dry to Ultra High Purity and Research Grades are used in laser cutting and marking operations, spanning everything from medical devices to steel fabrication. Growers utilize measured amounts of CO2 to improve fertilizers in greenhouse operations. High purity CO2 is generally used as an oxygen-free atmosphere for anaerobic incubation, and in the preparation of special application mixtures for blood gas monitoring.

With all these applications, having local Sioux Falls experts on hand to answer questions about carbon dioxide can be really helpful. Give them a call today at A-OX Welding Supply at 605-336-1125 or contact us online.