PRODUCTION OF NON-CAKING BLENDS OF SODIUM TRIPOLYPHOSPHATE HEXAHYDRATE AND SODIUM NITRILOTRIACETATE MONOHYDRATE OR DIHYDRATE, AND THEIR USE AS DETERGENTS, CLEANSING OR RINSING AGENTS

摘要

1297754 Non-caking sodium tripolyphosphate blend KNAPSACK AG 19 April 1971 [27 April 1970] 25773/71 Addition to 1219749 Heading C5D A non-caking blend of sodium tripolyphosphate hexahydrate and sodium nitrilotriacetate monohydrate or dihydrate is prepared by spraying an aqueous suspension as hereinafter defined having a temperature of between 0‹ and 80‹ C., on to anhydrous sodium tripolyphosphate or a blend of anhydrous sodium tripolyphosphate and sodium nitrilotriacetate, which is constantly agitated, the aqueous suspension being used in quantities sufficient to provide all the water needed for the formation of the hexahydrate and when an excess proportion of water is used simultaneously blowing a gas and/or air stream over the sprayed material to evaporate the water in excess. The aqueous suspension contains (a) a portion of the anhydrous sodium tripolyphosphate, (b) a portion or the whole of the sodium nitrilotriacetate, or (c) a portion or the whole of the sodium nitrilotriacetate together with a portion of the anhydrous sodium tripolyphosphate. The aqueous phase may contain up to 10% wt. of a binder such as carboxymethyl cellulose, dextrin, alginates, gums or polyvinyl alcohol. The final product contains 3 to 70% wt. of sodium nitrilotriacetate monohydrate or dihydrate.