반응 #318929
ord-180c9b77ad30443c8d33bb90f4995bea
시약
반응 조건
후처리
- 1workup.ADDITIONBy introducing the acid solution slowly
실험 절차
Referring to the FIGURE, an acidic premix solution containing calcium phosphate is provided by diluting a good grade of low impurity commercial phosphoric acid in the dilution tank (10) to form an approximately 20-30% by weight phosphoric acid solution. Calcium hydroxide and water are added to the premix tank (11) to form a solution with excess calcium hydroxide, and the diluted phosphoric acid solution is added to the premix tank (11) with high shear agitation provided by a high speed agitator (12). The amount of water added to the premix tank (11) is variable. Depending upon the amount of calcium hydroxide present, a given amount of water is able to dissolve a specific amount of that calcium hydroxide at the temperature maintained in the premix tank (11) and the main reactor (13). The amount of water added to control the heat of reaction is such that cool conditions below about 30°C. is maintained in order to provide the highest solubility of the calcium hydroxide in both the premix tank (11) and the main reactor (13). The phosphoric acid is added gradually to the premix tank (11), and upon the formation of an interim reaction product, more calcium hydroxide can be dissolved by the given volume of water in the tank (11). Thus, more calcium hydroxide can be dissolved than would dissolve in the water initially present in the tank (11). By introducing the acid solution slowly into premix tank (11), a substantial amount of suspended calcium hydroxide is thereby dissolved to form an acidic calcium phosphate (monocal) premix.