COMPRESSED POWDER CONTAINING SILICON DIOXIDE OBTAINED BY HEATING AS BASE, PRODUCTION OF COMPRESSED POWDER, CATALYST COMPRISING THE SAME, SUPPORTED CATALYST FOR PRODUCING VINYL ACETATE MONOMER, PRODUCTION OF THE SAME CATALYST AND CATALYST USED FOR REACTION UNDER HYDROTHERMAL CONDITION AND FOR HYDRATION OF OLEFIN

• Main Authors: PANSTER PETER DR, TACKE THOMAS DR, ROTGERINK HANS LANSINK DR, KRAUSE HELMFRIED DR, BURMEISTER ROLAND DR
• Format: Patent
• Language: English
• Published: 31.03.1998
• Edition: 6
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ADHESIVES; APPARATUS THEREFOR; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS THEREOF; CONCRETE; DYES; GENERAL METHODS OF ORGANIC CHEMISTRY; INORGANIC CHEMISTRY; LIME, MAGNESIA; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-METALLIC ELEMENTS; ORGANIC CHEMISTRY; PAINTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; POLISHES; PREPARATION OF CARBON BLACK; REFRACTORIES; SLAG; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; TREATMENT OF NATURAL STONE

PROBLEM TO BE SOLVED: To obtain compressed powder improved in purity, activity, selectivity, etc., by compressing powder obtained by drying a mixture of a specific silicon dioxide with methyl cellulose, microwax and/or polyethylene glycol and water and carrying out heat treatment of the compressed powder. SOLUTION: A volatile silicon compound is sprayed into a detonating gas frame comprising hydrogen and air to hydrolyze the silicon compound to afford silicon dioxide comprising >99.8wt.% SiO2 content and <0.2% other component content, having 0.8-200μm outside diameter, 30-400m /g BET surface area, 0.5-1.3mL/g pure volume and 10-250N breakage strength and having <5wt.% wear rate and 350-750g/L apparent weight. The silicon dioxide in an amount of 50-90wt.% is mixed with methyl cellulose in an amount of 0.1-20wt.%, microwax and/or polyethylene glycol in an amount of 0.1-15wt.% and water and the mixture is dried at 80-150 deg.C and compressed to provide the objective compressed powder having 0.8-20mm outside diameter. The compressed powder is heat-treated at 400-1200 deg.C for 0.5-8hr.