反应详情

In a 20-l container equipped with an agitator was placed 3.0 l of an aqueous solution of 10 wt/vol% of calcium chloride. With stirring 11.3 l of another aqueous solution of 5 wt/vol% of sodium terephthalate was added thereto. Simultaneously with the addition, the solution became milky turbid, which indicated the formation of calcium terephthalate. The agitation was continued for 30 minutes. Next, solid/liquid separation was carried out to obtain calcium terephthalate trihydride, which was then heated at 200° C for 2 hours until anhydride. The resulting particles were plate particles with a thickness of 2 to 4 microns and a maximum diameter of 10 to 30 microns. A portion sampled from the dried calcium terephthalate was introduced and milled for 1 hour in a ball mill and then diluted with ethylene glycol so as to obtain a slurry of 10 wt/vol% of calcium terephthalate in ethylene glycol. The resulting slurry was classified by means of a centrifugal separator, obtaining granular calcium terephthalate anhydride having an average particle diameter of 4.0 microns and a volume shape factor of 0.20.

1. additionwas introduced
2. custommilled for 1 hour in a ball mill