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The mixture is cooled to below 0 degrees Celsius, where the calcium nitrate crystalises and can be separated from the phosphoric acid.
The resulting calcium nitrate produces nitrogen fertilizer. The filtrate is composed mainly of phosphoric acid with some nitric acid and traces of calcium nitrate, and this is neutralized with ammonia to produce a compound fertilizer.
Both products can be worked up together as straight nitrogen fertilizer.
Although Johnson created the process while working for the Odda Smelteverk, his company never employed it. Instead, it licensed the process to Norsk Hydro, BASF, Hoechst, and DSM. Each of these companies used the process, introduced variations, and licensed it to other companies. Today, only Yara (Norsk Hydro), BASF, AgroLinz, and GNFC still use the Odda process. Due to the alterations of the process by the various companies who employed it, the process is now generally referred to as the nitrophosphate process.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Nitrophosphate_process". A list of authors is available in Wikipedia.|