At present, industrial-scale production of carbon dioxide is by-product.
Most of the food-grade carbon dioxide from the fermentation, are generally by-products of the brewery, mainly for carbonated drinks. Some countries have stipulated that the carbon dioxide used for food can only be the food source.
Carbon dioxide is also a byproduct of calcium carbonate calcined lime. The carbon dioxide obtained by this approach is generally used for industrial purposes, such as oilfield mining.
In natural gas and coal chemical industry, a large amount of high-purity carbon dioxide can be produced in the process, and some of them are also entering the market.
In addition, natural gas fields with carbon dioxide at individual sites.