Abstract: The invention relates to a method for the production of calcium dipropionate by a batch process in a single pressure-resistant reaction vessel. The reaction vessel is charged with calcium oxide, calcium hydroxide, calcium carbonate or a mixture thereof. Then, pure high-concentrated propionic acid, preferably in a concentration of above 99% is added to the solid raw materials. The heat (up to 160° C.) and pressure (up to 10 bar) are retained in the reaction vessel and are subsequently used to discharge the reaction water after the complete amount of acid has been added. After a reaction time of 3 to 6 hours, pure calcium dipropionate with a water content of below 1% is obtained.

Abstract: The invention relates to a solid-material method for producing calcium dipropionate in a pressure-resistant solid-state mixing reactor by charging calcium oxide, calcium hydroxide or calcium carbonate or mixtures of these calcium compounds, and adding propionic acid by a reaction directly in the solid phase under a pressure that is increased above normal pressure.

Abstract: A composition for preserving fodder material,a) 5-41% by weight alkali and/or alkaline earth metal salts of benzoic acid, calculated as sodium salts in each case,b) 1-14% by weight alkali and/or alkaline earth metal salts of C.sub.1 -C.sub.3 carboxylic acids, calculated as sodium salts in each case,c) 10 to <59% by weight propionic acid, calculated as pure propionic acid, andd) >30-<80% by weight water,wherein the total amount of all the components a) to d) is 100% by weight, and the sum of b) and c) is less than 60% by weight, and wherein all % by weight are given with respect to the total amount of all the components a) to d), and a method of preparing the composition and its use for preserving fodder materials are described.