Preparation of detergent grade sodium tripolyphosphate from wet process phosphoric acid and soda ash

摘要: A process for preparing detergent grade sodium tripolyphosphate from wet phosphoric acid comprising neutralizing said to a pH at which the Na:P ratio is about 5:3, contacting resultant mixture of mono- and disodium orthophosphates with an oxidizing agent selected group consisting ozone, hydrogen peroxide mixtures thereof, in amounts sufficient oxidize color causing impurities, drying heating effect change tripolyphosphate.