CaOCl2 (calcium oxychloride) is bleaching powder.
Preparation of bleaching powder: This is prepared by passing chlorine gas over slaked lime for a long time.
Ca(OH)2(s) + CI2(g) → CaOCl2(s) + H2O(l)
For its manufacture, Bachman’s plants is used which is shown in Fig. 2.5.
This consists of a vertical cast iron tower fitted with a hopper at the top through which slaked lime is fed and hot air and chlorine enters near the base in opposite direction. The reaction takes place in the different shelves which contains rotating rakes. Bleaching powder is collected in the drum kept at the base.
Fig. 2.5. Bachman plant for manufacturing bleaching powder.
