Calcium Carbonate → Calcium Carbonate

Participants

Reaction Steps

An aqueous slurry of calcium carbonate was prepared by charging a 300 mL reaction flask equipped with a stirrer with 10.0 g (100 mmol) of calcium carbonate (Escalon #2300 (average particle size, 1.7 μm), available from Sankyo Seifun KK) and 90.0 g of water. An aqueous solution of 15.8 g (100 mmol) of phenylphosphonic acid (Nissan Chemical Industries, Ltd.) dissolved in 89.5 g of water was gradually added dropwise at room temperature (about 25° C.) to this slurry with stirring, thereby effecting a reaction for one hour. The slurry was then filtered and the wet cake was thoroughly rinsed with water. The wet cake was subsequently dried at 200° C. for at least 12 hours, yielding a white powder of calcium phenylphosphonate. FIG. 4 shows a micrograph taken with a field-emission scanning electron microscope (SEM: JSM-7400F, manufactured by JEOL Ltd.) of the white powder of calcium phenylphosphonate thus obtained.

Provenance & Evidence