Composition comprising a liquid absorbed on a support based on precipitated silica

Abstract

The invention concerns a conditioned composition comprising at least a liquid absorbed on a support containing a precipitated silica, said silica being in the form of substantially spherical beads and having: a mean pellet size greater than 150 μm; a filling density in compact state (DRT) greater than 0.29; an oversize rate for a grid with mesh aperture size of 75 μm of at least 92% by weight. The invention also concerns the use of such a silica as a support for liquid.

1 . Conditioned composition comprising at least one liquid absorbed on a support containing a precipitated silica, characterized in that the said silica is in the form of substantially spherical beads and has: 
 an average bead size in excess of 150 μm,    a packed filling density (PFD) in excess of 0.29,    a 75 μm screen oversize of at least 92% by weight.    
     
     
         2 . Composition according to    claim 1   , characterized in that the said silica has an average bead size of at least 200 μm, in particular between 200 and 290 μm.  
     
     
         3 . Composition according to one of claims  1  and  2 , characterized in that the said silica has a packed filling density of at least 0.30, in particular of at least 0.31.  
     
     
         4 . Composition according to one of    claims 1    to    3   , characterized in that the said silica has a 75 μm screen oversize of at least 93% by weight, in particular of at least 94% by weight.  
     
     
         5 . Composition according to one of    claims 1    to    4   , characterized in that the said silica has a DOP oil absorption value of at least 250 ml/100 g, preferably between 250 and 280 ml/100 g, in particular between 255 and 275 ml/100 g.  
     
     
         6 . Composition according to one of    claims 1    to    5   , characterized in that the said silica has a pore volume (V d1 ) made up of pores having a diameter smaller than 1 μm of less than 1.95 cm 3 /g, in particular of less than 1.90 cm 3 /g.  
     
     
         7 . Composition according to one of    claims 1    to    6   , characterized in that the said silica results from the use of a nozzle atomizer to dry a suspension of silica obtained by precipitation.  
     
     
         8 . Composition according to    claim 7   , characterized in that, before it is dried, the said silica suspension has a solids content of between 22 and 24% by weight, preferably between 22.5 and 23.5% by weight.  
     
     
         9 . Composition according to one of    claims 1    to    8   , characterized in that the said composition has a liquid content of at least 50% by weight, in particular between 50 and 65% by weight.  
     
     
         10 . Composition according to one of    claims 1    to    9   , characterized in that the said liquid is a preservative, a flavouring, a colorant or a liquid supplement for animal feed.  
     
     
         11 . Composition according to one of    claims 1    to    10   , characterized in that the said liquid is vitamin E or vitamin E acetate.  
     
     
         12 . Composition according to one of    claims 1    to    11   , characterized in that the said composition has a 75 μm screen oversize of at least 97% by weight, in particular of at least 98% by weight.  
     
     
         13 . Composition according to one of claims  1  to  12 , characterized in that the said composition has a flow time t f  of less than 10 seconds for 50 grams and for a passage diameter of 8 mm, preferably of less than 9 seconds.  
     
     
         14 . Use of a precipitated silica as a liquid support, in particular as a liquid supplement for animal feed, characterized in that the said silica is in the form of substantially spherical beads and has: 
 an average bead size in excess of 150 μm, preferably in excess of 200 μm,    a packed filling density (PFD) in excess of 0.29, preferably of at least 0.30,    75 μm screen oversize of at least 92% by weight, preferably of at least 93% by weight.    
     
     
         15 . Use according to    claim 14   , characterized in that the said silica has a DOP oil absorption value of at least 250 ml/100 g, preferably between 250 and 280 ml/100 g.  
     
     
         16 . Use according to one of claims  14  and  15 , characterized in that the said silica has a pore volume (V d1 ) made up of pores having a diameter smaller than 1 μm of less than 1.95 cm 3 /g, in particular of less than 1.90 cm 3 /g.  
     
     
         17 . Use according to one of    claims 14    to    16   , characterized in that the said silica results from the use of a nozzle atomizer to dry a suspension of silica obtained by precipitation, the said silica suspension preferably having a solids content of between 22 and 24% by weight before it is dried.  
     
     
         18 . Use according to one of    claims 14    to    17   , characterized in that the said liquid is vitamin E or vitamin E acetate.