CATALYST FOR PRODUCTION OF METHACRYLIC ACID

PURPOSE:To obtain a catalyst having higher reactivity, selectivity and long life by calcining a solid of partially neutralized salt of specified heteropoly acid at 400-500 deg.C in an inert gas. CONSTITUTION:Vanadium pentoxide (V2O5) is used as the vanadium source. The partial neutral salt of hetero...

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Hauptverfasser:	NAGAI KOICHI, NAGAOKA YOSHIHIKO, OSU MOTOMASA
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a catalyst having higher reactivity, selectivity and long life by calcining a solid of partially neutralized salt of specified heteropoly acid at 400-500 deg.C in an inert gas. CONSTITUTION:Vanadium pentoxide (V2O5) is used as the vanadium source. The partial neutral salt of heteropoly acid is prepared as a dissolved or suspended state of the catalyst source in water in the presence of ammonium group and is heated at >=80 deg.C for one hour or longer. Then the material is concentrated and drive to obtain the solid, which is then calcined at 400-500 deg.C in an inert gas. Thus, the catalyst for the production of methacrylic acid is obtained. This catalyst can be used for the production of methacrylic acid by oxidation of methacrolein or various source materials. The catalyst is used in a signal form, or is deposited on a carrier as alumina, silica, silicon carbide, or diluted or mixed for use.