C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 3/18 (2006.01) C23F 11/06 (2006.01)
Patent
CA 2084854
HOE 91/H 030 Process for the preparation of alkali metal acetates Abstract To prepare a corrosion-inhibitlng liquid de-icing agent based on alkali metal acetates, 30 to 50 percent strength by weight alkali metal hydroxide solution is introduced into a reaction container provided with a cooling device and a mixing device, and 85 to 100% strength acetic acid is metered into the reaction container until the ratio by weight of acetic acid to alkali metal hydroxide solution therein (0.30 to 0.45) : 1. A portion of this solution is transferred from the reaction container to a stirred dissolving tank and 0.03 to 1% by weight, relative to the batch, of benzotriazole and/or tolyltriazole and/or imidazole is dissolved therein. The resulting solution containing azole is introduced into the reaction con- tainer along with 0.01 to 0.2% by weight of phosphoric acid, relative to the batch. Acetic acid continues to be metered into the reaction container until the density of the solution in the reaction container is 1.07 to 1.39 g/cm3 at 20°C. Small amounts of alkali metal hydroxide solution or acetic acid are then introduced into the reaction container until the pH of the solution therein is 9.2 to 9.8. Finally, this solution is with- drawn from the reaction container as a liquid de-icing agent.
Bettermann Gerhard
Himmrich Johannes
Schimmel Guenther
Clariant Gmbh
Fetherstonhaugh & Co.
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