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AssigneeJx Nippon Oil & Energy Corporation
InventorsKoichi Matsushita, Chikanori Nakaoka, Norikazu Nishiyama
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This invention relates to a method wherein a high-purity paraxylene can be produced efficiently by using a catalyst having a molecular sieving action (or shape selectivity) and being excellent in the catalytic activity without isomerization and adsorption-separation steps. More particularly, it relates to a method of producing a high-purity paraxylene, characterized in that MFI type zeolite having a primary particle size of not more than 100 μm, a structure defining agent and silica material having an average particle size of not less than 10 nm but less than 1.0 μm are used as a starting material, and a synthetic zeolite catalyst produced by subjecting the MFI type zeolite to a coating treatment with an aqueous solution obtained by mixing so as to satisfy X×Y<0.05 (wherein X is a concentration of the silica material (mol %) and Y is a concentration of the structure defining agent (mol %)) is used in the alkylation or disproportionation of at least one of benzene and toluene as a starting material.
A method of producing a synthetic zeolite catalyst by coating MFI type zeolite having a primary particle size of not more than 100 μm with a monocrystalline silicate, wherein the MFI type zeolite is subjected to a coating treatment in which the MFI type zeolite is immersed into an aqueous solution obtained by mixing a structure defining agent and a silica material having an average particle size of not less than 10 nm but less than 1.0 μm so as to satisfy X×Y<0.05 (wherein X is a concentration of the silica material (mol %) and Y is a concentration of the structure defining agent (mol %)), then subjected to a hydrothermal treatment at a temperature of 120° C. to 250° C. for 0.5 hour to 48 hours and further fired.
Dependencies are inferred from the claim text.