PRODUCTION OF HYDRATED SILICIC ACID

摘要

PURPOSE:To produce high-purity porous hydrated silicic acid in large quantities by feeding a raw material of liquid hydrated silicate into a mineral acid phase and by causing a condensation reaction of silanol group to start. CONSTITUTION:The liquid raw material of hydrated silicate (example: water- glass) composed of 50-72wt% moisture content and 21-37wt% Si content is dropped from a nozzle onto the buffer solution phase (example: n-pentane) formed on a mineral acid phase, then is fed into the phase of mineral acid having the concentration of 1-36 normal at a room temp. -100 deg.C through the buffer solution phase, the condensation reaction is caused to take place from the surface of the raw material, and the porous hydrated silicide acid is formed. Thereby, the choking of a raw material-feeding port and the generation of the raw material of dumpling-like hydrated silicic acid can be prevented.