| 摘要 |
1,269,636. Cooling exothermic processes to avoid decomposition. CANADIAN INDUSTRIES Ltd. 20 June, 1969 [21 June, 1968], No. 29690/68. Heading B1X. [Also in Division C1] An exothermic process for the manufacture of solid free flowing material which involves cooling of the product to prevent decomposition comprises (a) providing a bed of solid particles of the material and/or inert substance wherein part of the bed forms a reaction zone and another part of the bed separate therefrom forms a cooling zone, (b) maintaining a circulation of particles between the reaction zone and the cooling zone by passage of gas through the bed, (c) maintaining the temperature of the particles in the reaction zone of the bed within the temperature range at which the reaction forming the material takes place and (d) feeding the reactants to the reaction zone from at least two separate reactant inlets so that mixing of the reactants occurs in the reaction zone distort from the cooling zone, of which one of the inlets may be an inlet for the said gas. The maintainance of the desired reaction temperature and the cooling may be effected by a heat exchanger (5) or by evaporative cooling of a liquid introduced into the reaction zone as a solvent or a reactant. The particles in the bed may comprise sand, and may be fluidised or spouted or slowly moving. The production of ammonium metabisulphite from ammonia, sulphur trioxide and water vapour is described. Also of ammonium nitrate from ammonia and aqueous nitric acid and mono- and di-ammonium phosphate from ammonia and phosphoric acid. |
