Amorphous alumino-silicate beads prodn. by sol-gel process - by dropping thin stream of freshly mixed aluminate and silicate soln. into forming oil

摘要

Prodn. is carried out by combining an aluminate and a silicate soln., opt. contg. other components, and immediately introducing the mixt. in a thin stream into a forming oil by the sol-gel process. The gel beads formed are subjected to other well-known stages of the sol-gel process. The beads are specified for use as catalyst, catalyst support, adsorbent or desiccant. A droppable mixt. is obtd., whereas previously a gel has formed immediately. It allows the use of cheap aluminate solns., e.g. waste liquors from synthetic zeolite mfr., instead of costly Al salt solns., and of fines from other processes, e.g. silica gel bead or zeolite mfr., and can be carried out in the usual plant for the sol-gel process.