PROCESS FOR THE PREPARATION OF FINELY DIVIDED PRECIPITATED SILICA

PROCESS FOR THE PREPARATION OF FINELY DIVIDED PRECIPITATED SILICA

The present invention provides a process for the preparation of finely divided precipitated silica. Finely divided precipitated silica is prepared by neutralization of alkali silicate solution, under continuous stirring, at 60° to 90° C. in presence of alkali metal salt as coagulating agent, in vari...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SOMANI, RAJESH, SHANTILAL, SHUKLA, DIPAK, BALWANTRAI, MODY, HARESH, MAHIPATLAL, JASRA, RAKSH, VIR, BAJAJ, HARI, CHAND, VYAS, NIRAJ, RAMESHCHANDRA
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:The present invention provides a process for the preparation of finely divided precipitated silica. Finely divided precipitated silica is prepared by neutralization of alkali silicate solution, under continuous stirring, at 60° to 90° C. in presence of alkali metal salt as coagulating agent, in various neutralization steps during which neutralization is interrupted for specific time. Further acidic silica sol, is added until 60 to 80% of total alkali is neutralized. The reaction mixture is then aged at least for 3 minute under continuous agitation, followed by circulation through centrifugal pump at an appropriate rate.