VERFAHREN ZUR HERSTELLUNG EINER FÄLLUNGSKIESELSÄURE MIT NIEDRIGER WASSERAUFNAHME

Production of precipitated silica comprises adding acid to a silicate solution with a silicon oxide (SiO2) content of below 15 g/l to adjust the pH to 7-8, simultaneously adding silicate and acid in amounts so that the pH remains at between 7 and 8 and the SiO2 content remains at or below 35 g/l, ad...

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Bibliographische Detailangaben
Hauptverfasser:	VALERO, REMI, CHEVALLIER, YVONICK
Format:	Patent
Sprache:	ger
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOUNDS THEREOF FOODS OR FOODSTUFFS FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J HUMAN NECESSITIES HYGIENE INORGANIC CHEMISTRY MEDICAL OR VETERINARY SCIENCE METALLURGY NON-METALLIC ELEMENTS ORGANIC MACROMOLECULAR COMPOUNDS PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT THEIR TREATMENT, NOT COVERED BY OTHER CLASSES USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	Production of precipitated silica comprises adding acid to a silicate solution with a silicon oxide (SiO2) content of below 15 g/l to adjust the pH to 7-8, simultaneously adding silicate and acid in amounts so that the pH remains at between 7 and 8 and the SiO2 content remains at or below 35 g/l, adding acid to adjust the pH to 3-6.5, filtering the mixture and drying the filter cake. Independent claims are also included for: (1) an aqueous silica composition obtainable after disintegration of the above filter cake; (2) precipitated silica with a water uptake below 6% produced by the above process or by spray drying the composition of (1), and (3) a pharmaceutical composition comprising silica produced by the above process or by spray drying the composition of (1).