Engel-Precht process

Enflurane [13838-16-9]C Engel-Precht process Engine coolants... 

Potassium Carbonate. Except for small amounts produced by obsolete processes, eg, the leaching of wood ashes and the Engel-Precht process, potassium carbonate is produced by the carbonation, ie, via reaction with carbon dioxide, of potassium hydroxide. Potassium carbonate is available commercially as a concentrated solution containing ca 47 wt % K CO or in granular crystalline form containing 99.5 wt % K CO. Impurities are small amounts of sodium and chloride plus trace amounts (<2 ppm) of heavy metals such as lead. Heavy metals are a concern because potassium carbonate is used in the production of chocolate intended for human consumption. 

The carbonate also can be made from potassium chloride, magnesium carbonate trihydrate and carbon dioxide under 30 atm at ordinary temperatures by Engel-Precht process ... 

Another method of preparation, called the Engel-Precht process, is a modification of this procedure. A mixture of potassium chloride, magnesium carbonate or magnesium oxide, and carbon dioxide is treated under 30 atmospheres... 

Engel-Precht An improved version of the Engel process, developed in 1889 by H. Precht at the Salzbergwerk Neu Stassfurt, Germany, and operated until 1938. 

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