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US 10,239,813 B2Granted
Method for producing calcium dipropionate
AssigneeAddcon Europe GmbH
InventorsKlaus Ederle-Lerch, Norman Killian, Bernd Kochannek, Hans-Jürgen Stüwe
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AssigneeAddcon Europe GmbH
InventorsKlaus Ederle-Lerch, Norman Killian, Bernd Kochannek, Hans-Jürgen Stüwe
Estimating the term…
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.
A carrier-free solid-material method for the production of powdery calcium propionate 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 of 1 bar up to 10 bar, the reaction is performed for a time within a range of from 0.5 to 3 hours.
Dependencies are inferred from the claim text.