Method for the de-acidification of celluso material

Abstract

A method for obtaining a chemical composition for de-acidification of cellulose-type material comprises preparing a solution of 30 to 70% carbonated magnesium di-n-propylate in n-propanol and diluting the solution by addition of a hydrofluorocarbon diluent selected from the group consisting of 1,1,1,2-tetrafluoroethane and 1,1,1,2,3,3,3-heptafluoropropane.

1 . A method for obtaining a chemical composition for de-acidification of cellulose-type material comprising: 
 preparing a solution of 30 to 70% carbonated magnesium di-n-propylate in n-propanol; and    diluting the solution by addition of a hydrofluorocarbon diluent selected from the group consisting of 1,1,1,2-tetrafluoroethane and 1,1,1,2,3,3,3-heptafluoropropane.    
     
     
         2 . A method according to  claim 1 , in which the preparation of said solution of carbonated magnesium di-n-propylate in n-propanol further comprises: 
 reacting a prepared suspension of magnesium di-n-propylate in n-propanol with dry gaseous carbon dioxide, until a solution of carbonated magnesium di-n-propylate in n-propanol is obtained; and    separating the solution of carbonated magnesium di-n-propylate from n-propanol.    
     
     
         3 . A method according to  claim 2 , in which the preparation of said suspension of magnesium di-npropylate in n-propanol comprises: 
 reacting magnesium metal with anhydrous n-propanol in the presence of iodine at a boiling point temperature.    
     
     
         4 . A method according to  claim 2 , in which the preparation of said suspension of magnesium di-npropylate in n-propanol comprises: 
 reacting magnesium metal with anhydrous n-propanol in the presence of iodine at a reflux temperature and adding toluene to form an azeotrope with n-propanol.    
     
     
         5 . A method according to  claim 2 , in which the preparation of said suspension of magnesium di-npropylate in n-propanol comprises: 
 reacting magnesium in powder form with a granulometric distribution lying between 50 and 150 m with anhydrous n-propanol in the presence of iodine; and    cooling said reaction mixture to a boiling point temperature when hydrogen is released.    
     
     
         6 . A method for de-acidification of a cellulose-type material, comprising: 
 obtaining a chemical composition comprising a solution of 30 to 70% carbonated magnesium di-n-propylate in n-propanol diluted in a solution of hydrofluorocarbon diluent for de-acidification of cellulose-type material;    applying the chemical composition to the cellulose-type material by spray.