公开(公告)号：US5958588A

公开(公告)日：1999-09-28

申请号：US18894

申请日：1998-02-05

申请人： Rudiger Schutte ,  Hans Christian Alt ,  Catrin Becker-Balfanz ,  Manfred Sauer ,  Lukas Von Hippel ,  Oliver Feuer ,  Jurgen Lorosch

发明人： Rudiger Schutte ,  Hans Christian Alt ,  Catrin Becker-Balfanz ,  Manfred Sauer ,  Lukas Von Hippel ,  Oliver Feuer ,  Jurgen Lorosch

IPC分类号： C01C3/08 ,  C01C3/10 ,  B32B5/16

CPC分类号： C01C3/10 ,  C01C3/08 ,  C01P2004/32 ,  C01P2004/50 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/90 ,  Y10T428/2982

摘要： A process for the direct preparation of alkali metal cyanide and alkaline earth metal cyanide granules from an HCN-containing gas and an aqueous solution or suspension of an alkali metal or alkaline earth metal hydroxide. The reaction is performed in a reactor for fluidized bed spray granulation, wherein a solution or suspension of the hydroxide is sprayed onto seed granules of the cyanide being prepared and at the same time a hydrogen cyanide-containing gas is supplied to the reactor and water is evaporated by means of a fluidizing gas. The preferred fluidizing gas is steam. The reaction gases from a BMA or Andrussow process may be quenched with water and the gas mixture used as fluidizing gas. By using a CO.sub.2 -free HCN-containing gas, alkali metal cyanide granules with advantageous properties, including a combined concentration of alkali metal carbonate and alkali metal formate of less then 0.4 wt. %, are obtainable.

摘要翻译： 用于从含HCN的气体和碱金属或碱土金属氢氧化物的水溶液或悬浮液直接制备碱金属氰化物和碱土金属氰化物颗粒的方法。 该反应在流化床喷雾造粒反应器中进行，其中将氢氧化物的溶液或悬浮液喷雾在所制备的氰化物的种子颗粒上，同时将含有氰化氢的气体供应至反应器，水为 通过流化气体蒸发。 优选的流化气体是蒸汽。 来自BMA或Andrussow工艺的反应气体可以用水淬火并将气体混合物用作流化气体。 通过使用不含CO 2的气体，具有有利性质的碱金属氰化物颗粒，包括碱金属碳酸盐和碱金属甲酸盐的组合浓度小于0.4wt。 ％，可以获得。

公开(公告)号：US5674617A

公开(公告)日：1997-10-07

申请号：US570801

申请日：1995-12-12

申请人： Herbert Riemenschneider ,  Christian Alt ,  Martina Claus ,  Jurgen Lorosch ,  Josef Leutner ,  Heinz Monch

发明人： Herbert Riemenschneider ,  Christian Alt ,  Martina Claus ,  Jurgen Lorosch ,  Josef Leutner ,  Heinz Monch

IPC分类号： B01J2/04 ,  B01J2/16 ,  C01C3/10 ,  B32B5/16 ,  C01C3/08

CPC分类号： C01C3/10 ,  C01P2004/32 ,  C01P2004/50 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/21 ,  C01P2006/80 ,  Y10T428/2982 ,  Y10T428/2991 ,  Y10T428/2993

摘要： New alkali metal cyanide granulates based on sodium cyanide or potassium cyanide and a method for their preparation are disclosed. Commercially available alkali metal cyanide granulates consist of irregular particles; disadvantages are in particular the tendencies to form dust and to cake. The disclosed alkali metal cyanide granulates demonstrate a reduced tendency to cake and virtually no abrasion. The granulates are characterized by essentially spherical particles with particle diameters in the range 0.1 to 20 mm, a bulk density of more than 600 g/dm.sup.3, an abrasion of less than 1%, and a caking index of at most 4. The granulates can be prepared by fluidized bed spray granulation involving spraying an aqueous solution containing alkali metal cyanide onto alkali metal cyanide nuclei in a fluidized bed and evaporating the water.

摘要翻译： 公开了基于氰化钠或氰化钾的新的碱金属氰化物颗粒及其制备方法。 市售的碱金属氰化物颗粒由不规则颗粒组成; 缺点尤其是形成灰尘和蛋糕的倾向。 所公开的碱金属氰化物颗粒显示出降低的滤饼倾向并且几乎没有磨损。 颗粒的特征在于粒径在0.1至20mm，堆积密度大于600g / dm 3，磨损小于1％，结块指数至多为4的基本上为球形的颗粒。颗粒可以 通过流化床喷雾造粒制备，包括在流化床中将含有碱金属氰化物的水溶液喷涂到碱金属氰化物核上并蒸发水。