Reaction #684937

Reaction equation

sodium orthosilicate

aluminum chloride

sodium hydroxide

→

aluminum silicate

Conditions

Workup

1. 1
   Washthe mixture was fully washed with water
2. 2
   workup.ADDITIONIN hydrochloric acid was added

Procedure

A sodium orthosilicate aqueous solution (concentration 0.1 mol/L) and aluminum chloride (concentration 0.15 mol/L) were added in equivalent amounts with fully stirring. Further, 1N sodium hydroxide was gradually added to attain a pH of 6, the mixture was fully washed with water, and IN hydrochloric acid was added to attain a pH of 4. The mixture was heated at 100° C. for 2 days to give amorphous aluminum silicate. Washing with water was again carried out to remove a superfluous ion component, and then centrifugal separation was carried out to give a slurry of 20% concentrated amorphous silicate having a tubular structure (to be referred to as “moisture adsorbent (a-II)” hereinafter). Part of the slurry was dried to obtain moisture adsorbent (a-II) in the form of a powder, and the powder was measured for a specific surface area according to a BET method to show that it had a specific surface area of 450 m2/g.

Source