Supercooling inhibitor and process for preparing the same

A process for preparing a supercooling inhibitor, comprising the steps of:

• (a) heating a mixture of sodium acetate trihydrate (CH.sub.3 COONa.3H.sub.2 O) and a supercooling inhibitor base comprising one or more members selected from the group consisting of sodium pyrophosphate (Na.sub.4 P.sub.2 O.sub.7), trisodium monohydrogen pyrophosphate (Na.sub.3 HP.sub.2 O.sub.7), disodium dihydrogen pyrophosphate (Na.sub.2 H.sub.2 P.sub.2 O.sub.7), monosodium trihydrogen pyrophosphate (NaH.sub.3 P.sub.2 O.sub.7), sodium pyrophosphate decahydrate (Na.sub.4 P.sub.2 O.sub.7.10H.sub.2 O) and disodium dihydrogen pyrophosphate hexahydrate (Na.sub.2 H.sub.2 P.sub.2 O.sub.7.6H.sub.2 O), to at least the melting point of said sodium acetate trihydrate;
• (b) withdrawing a mass comprising said supercooling inhibitor base and said sodium acetate trihydrate out of the molten sodium acetate trihydrate;
• and
• (c) cooling the withdrawn mass so that the sodium acetate trihydrate freezes and adheres to the surface of said supercooling inhibitor base.