Calcium Chloride → HCID 87972024, compound

Participants

Reaction Conditions

Reaction Steps

296 Grams of dimethyl 5-sulfoisophthalate sodium salt were placed together with 2000 g of ion exchanged water in a reactor equipped with a stirrer. The contents in the reactor were heated with stirring to 80° C. so that the sodium salt was dissolved in water. A solution of calcium chloride dissolved in an amount of 55.5 g into 900 g of ion exchanged water was then gradually added dropwise to the thus obtained solution. The resulting mixture was cooled to 30° C. and filtered to separate white precipitates. The precipitates were dispersed in 3000 g of ion exchanged water. The dispersion was heated to 80° C., maintained at that temperature for 1 hour, cooled to 30° C. and then filtered. The precipitates were washed with water. Such a procedure including dispersion, heating, filtration and washing steps was repeated once more. The thus obtained precipitates were dried at 120° C. for 5 hours to obtain 156 g of dimethyl 5-sulfoisophthalate calcium salt (Compound of the above formula (2)) as a white powder. The atomic absorption analysis revealed that the 5-sulfoisophthalic acid calcium salt powder contained 6.8% by weight of calcium.

Provenance & Evidence