Magnesium ethoxide having a high coarse particle content, process for its preparation and its use

Abstract

Particulate magnesium ethoxide having a high coarse particle content can be obtained in a simple and economical manner by the present invention, which provides a process for preparing particulate magnesium ethoxide having a coarse grain content, and includes reacting metallic, optionally activated, magnesium with liquid ethanol under pressure at a temperature above 78° C. The present invention also relates to particulate magnesium ethoxide having a coarse grain content, which contains: <40% by weight of a screening fraction ≦500 μm and ≧60% by weight of a screening fraction >500 μm.

1 . A particulate magnesium ethoxide having a coarse grain content comprising: 
 <40% by weight of a screening fraction ≦500 μm and    ≧60% by weight of a screening fraction >500 μm.    
     
     
         2 . The particulate magnesium ethoxide as claimed in    claim 1   , comprising <10% by weight of a screening fraction <315 μm.  
     
     
         3 . The particulate magnesium ethoxide as claimed in    claim 1   , comprising from 0.01 to 5% by weight of a screening fraction <315 μm.  
     
     
         4 . The particulate magnesium ethoxide as claimed in    claim 1   , comprising ≧80% by weight of a screening fraction <500 μm.  
     
     
         5 . The particulate magnesium ethoxide as claimed in    claim 1   , comprising >40% by weight of a screening fraction >800 μm.  
     
     
         6 . The particulate magnesium ethoxide as claimed in    claim 1   , which is produced by a process comprising reacting metallic, optionally activated, magnesium with liquid ethanol under pressure at a temperature above 78° C.  
     
     
         7 . A process for preparing particulate magnesium ethoxide having a coarse grain content, comprising: 
 reacting metallic, optionally activated, magnesium with liquid ethanol under pressure at a temperature above 78° C.    
     
     
         8 . The process as claimed in    claim 7   , wherein the liquid ethanol and metallic magnesium are contacted with one another in a reaction space, heated under pressure to a temperature above 78° C., wherein the liquid ethanol is available as a reaction partner, and wherein hydrogen is formed and ejected from the reaction space.  
     
     
         9 . The process as claimed in    claim 7   , wherein the reaction temperature is from >78 to 200° C. and the pressure in the reaction space is above 1 bar absolute.  
     
     
         10 . The process as claimed in    claim 7   , wherein the reaction pressure is above 1 bar absolute.  
     
     
         11 . The process as claimed in    claim 7   , wherein the metallic magnesium has a particle size of 20 to 5000 μm.  
     
     
         12 . The process as claimed in    claim 7   , further comprising raising the temperature to above 90° C. at the start of the reaction.  
     
     
         13 . The process as claimed in    claim 7   , wherein hydrogen is formed and wherein the peak of hydrogen formation proceeds at a temperature below 90° C., and wherein the hydrogen is removed from the reaction space.  
     
     
         14 . The process as claimed in    claim 12   , further comprising continuing the reaction at a temperature above 90° C.  
     
     
         15 . A precursor for a Ziegler-Natta catalyst, comprising the magnesium ethoxide as claimed in    claim 1   .  
     
     
         16 . A ceramic precursor, comprising the magnesium ethoxide as claimed in    claim 1   .  
     
     
         17 . A precursor for book preservation media, comprising the magnesium ethoxide as claimed in    claim 1   .