| 摘要 |
1,129,481. Reactor for finely-divided solids; reactor for exothermic reactions. DEUTSCHE GOLD-UND SILBER SCHEIDEANSTALT. 20 May, 1965 [10 July, 1964], No. 8936/67. Divided out of 1112194. Headings B1F and B1X. A reactor for exothermic reactions comprises a vertical vessel 2 through which finelydivided solids may fall under gravity, having a sieve or screen 24 at its inlet, means for discharging the product at the lower part thereof and means 22 for heating the upper part thereof, the lower part being a cooling zone which may include cooling means 21. As shown in Fig. 1, finely divided reactants are transferred from hoppers 8, 9 to weighing hopper 7, intensive mixer 6 and storage container 5 for transmission to the reactor via screen 24 which may rotate or may have an agitator. The reaction is initiated by heater 22 and excess heat is removed by cooler 21. Product falls onto a pan 4 on the periphery of a rotary disc 3 and is transferred via zones in which different temperatures may be maintained by means of heating elements 32 to a discharge zone V having cooling device 140. In Fig. 2 (not shown) the discharge device comprises a tunnel embracing several heating zones through which trays (40) may be passed to collect and treat the material (41) before discharge. A reactive atmosphere may be supplied through pipe (23) in which case locks are provided at each end of the tunnel for the gas tight supply and removal of the trays. The apparatus may be used to prepare NaBH 4 and Na 2 SiO 3 from Na 2 B 4 O 7 , Si and Na 2 O in a hydrogen atmosphere as in Specification 1,112,194 (see Division C1). |
