Ferdinand Eduard Polzeniusz

Ferdinand Eduard Polzeniusz (born 1862 ; died 1918 ), also known as Polzenius, was an Austro-Hungarian chemist. He held several patents in the field of nitrogen chemistry, including the optimized production of calcium cyanamide ( calcium cyanamide ) from calcium carbide , which according to him was known as the Polzenius (z) process or, after further development by Constantin Krauss in Knapsack, as Polzenius (z) -Krauss- Process is called.

Production of nitrogen lime

In 1905, Polzeniusz developed a process that made it possible to produce calcium cyanamide or calcium cyanamide (CaCN ₂ ) at temperatures of around 700–800 ° C instead of the previously usual 1,100 ° C by adding calcium chloride as a catalyst to the calcium carbide . In contrast to the calcium cyanamide produced by Adolph Frank and Nikodem Caro , this substance, known as nitrogen lime , was produced by the Society for Nitrogen Fertilizers in Westeregeln and later by the Deutsche Karbid Aktiengesellschaft in Knapsack .

During the process, dry air (nitrogen), which has been freed of oxygen, is passed over pulverized calcium carbide at a temperature of approx. 700 ° C, to which up to 10% calcium chloride is added. The mixture of calcium carbide and calcium chloride changes into a sintered mass when the nitrogen is absorbed, which solidifies after cooling and is finely ground and used as a fertilizer.

supporting documents

1. ↑ Method of making Nitrogen Compound , patent specification April 14, 1903 (Google Patent Search)
2. ^ Article nitrogen lime in Otto Lueger: Lexicon of the entire technology and its auxiliary sciences, Vol. 8, Stuttgart and Leipzig 1910 .; P. 321.

Web links

• Chemia analityczna ilościowa . Krakow 1896 (digital copy of the Akademia Górniczo-Hutnicza, Poland)
• Method of making Nitrogen Compound , patent specification April 14, 1903 (Google Patent Search)