Due to the reduction of temperature and hence, the reduction of the saturation point of the aqueous NaHCO3 solution, a precipitation of NaHCO3 crystals will take place in the aqueous stream of NaHCO3 flowing through the NaHCO3 cooler 138 and this stream containing the aqueous solution of dissolved NaHCO3 at a temperature such for instance as 0??? C. will also contain suspended crystals of solid Na