Citric Acid → Magnesium Phosphate

Participants

Reaction Conditions

Reaction Steps

1280 g of de-ionized water was introduced into a 1 gallon vessel fitted with a Kady Lab Mill and stirred at a motor speed of 15 Hz. 40 g of trisodium phosphate decahydrate and 2 g of citric acid were then added to the vessel. The temperature of the vessel was increased to 98° C. and 300 g of 3.5% aqueous solution of magnesium chloride was titrated into the vessel. 10 minutes after completion of the magnesium chloride addition, a sample was taken from the vessel and the pH of the sample was measured to be 7.7. The motor speed of the Kady Mill was then increased to 45 Hz, and 450 g of Coarse Polymer Powder was introduced into the vessel. 30 minutes after introduction of the Coarse Polymer Powder, the vessel was rapidly cooled to 70° C. and the motor speed of the Kady Mill was then reduced to 15 Hz while cooling continued until the temperature reached 25° C.

Provenance & Evidence