METHOD OF PREPARING SILICAS WITH SPECIFIC PORE-SIZE AND/OR PARTICLE-SIZE DISTRIBUTION

Controlled addition of an acidifying agent to a silicate in stages to form a silica suspension which, after washing and drying, has specified characteristics. Preparation of silica by the reaction of an acidifying agent with a silicate, effected in the following stages: (1) Formation of an aqueous b...

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Bibliographische Detailangaben
Hauptverfasser:	VALERO, RÉMI, HERNANDEZ, JULIEN
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CHARACTERISTIC FEATURES OF FOOTWEAR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS COMPOUNDS THEREOF ELECTRICITY FOOTWEAR HUMAN NECESSITIES HYGIENE INORGANIC CHEMISTRY MEDICAL OR VETERINARY SCIENCE METALLURGY NON-METALLIC ELEMENTS ORGANIC MACROMOLECULAR COMPOUNDS PARTS OF FOOTWEAR PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	Controlled addition of an acidifying agent to a silicate in stages to form a silica suspension which, after washing and drying, has specified characteristics. Preparation of silica by the reaction of an acidifying agent with a silicate, effected in the following stages: (1) Formation of an aqueous base material of pH 2 -5 (preferably 2.5 - 5); (2) Simultaneous addition of a silicate and acidifying agent such that the pH is maintained at 2 - 5 (preferably 2.5 - 5); (3) Cease addition of acidifying agent whilst continuing addition of silicate until pH is 7 - 10 (preferably 7.5 - 9.5); (4) Resume simultaneous addition of agent and silicate to maintain pH at 7.5 - 9.5; and (5) Cease addition of silicate whilst continuing addition of acid until a pH value less than 6 is attained. Independent claims are also included for the silica obtained and its uses.