| 摘要 |
PURPOSE:To supply continuously an aq. reactive soln. without having a loss by passing a non-reactive fluid into a feed pipe in succession to the flow of the aq. reactive soln. to be fed into a reaction vessel. CONSTITUTION:A take-out valve 7 and a feed valve 12 are closed and an introducing valve 16 and a discharging valve 11 are opened to pass the non-reactive fluid 13 in a vessel 14 through a connecting piping 15 and a feed pipe 6 so as to be discharged to the outside of a system A from the valve 11. When the flow rate of the fluid 13 attains a prescribed value, the valves 16, 11 are closed and the valves 7, 12 are opened to supply an aq. soln. of reactive silver salt 4 at a prescribed flow rate into a reaction vessel 2 in which a hydrophilic colloidal aq. soln. 1 is filled. When the entire aq. soln. is discharged from the inside of a vessel 5, the valve 7 is closed and the valve 16 are opened to pass the fluid 2 to feed thoroughly the soln. 4 into the vessel 2 without allowing the soln. to remain in the pipe 6. On the other hand, the aq. soln. of reactive silver salt is fed from a system B into the vessel 2 by the method similar to the above-mentioned method and is made to react while the silver salt and halogen salt are stirred in the presence of the hydrophilic colloid. |
