The process of air distillation can be used to isolate small amounts of carbon dioxide; however, this process is not used often to isolate carbon out of the carbon dioxide form because only very small quantities can be obtained from this process. Larger amounts of carbon dioxide are obtained from reactions between metal carbonates and acids such as calcium carbonate and sulfuric acid. Limestone can also produce carbon dioxide through heating the limestone to 1562 °F. The carbon can then be separated from the oxygen.
The large amounts of pure carbon that is available in nature in the form of graphite lead to unnecessary large scale isolations of carbon. Most carbon products are created by manipulating pure graphite to artificially create some of the more desired forms of pure carbon such as diamonds and buckminsterfullerene. These artificial forms of carbon are produced by methods using heat, lasers, and enormous amounts of pressure.
