Benzene hydrorefining catalyst, and preparation method and application thereof

Abstract

The invention specifically relates to a benzene hydrorefining catalyst, and a preparation method and application thereof, belonging to the technical field of benzene hydrorefining catalysts. The preparation method comprises the following steps: S1. Uniformly mixing raw materials for a carrier of the benzene hydrorefining catalyst, carrying out extrusion granulation, and then carrying out sinteringmolding at 680 to 700 DEG C to obtain the carrier; S2, adding phosphoric acid into water with a temperature of 46-50 DEG C, carrying out uniform mixing, then carrying out heating to 88-92 DEG C, adding cobalt carbonate for a reaction, then adding molybdenum trioxide after gas release of the reaction is completed, and then carrying out mixing and dissolving to obtain an activation solution; S3, placing the carrier in an enclosed reactor, and carrying out multi-stage high-temperature activation; and S4, carrying out cooling to room temperature to obtain the benzene hydrorefining catalyst. According to the invention, phosphoric acid and rare earth metals are added into the benzene hydrorefining catalyst, so dispersion of the active component molybdenum is facilitated, the specific surface area of the catalyst is larger and more uniform, and active sites are increased; moreover, the preparation method is simple and employs a multi-stage high-temperature activation manner for activation, so the water content of the catalyst is reduced, the water resistance of the catalyst is improved, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to the technical field of benzene hydrogenation catalysts, in particular to a benzene hydrogenation refining catalyst and its preparation method and application. Background technique [0002] Cyclohexane is an important organic chemical raw material. It is colorless, easy to flow, and has a pungent odor. It is mainly used to produce cyclohexanol, cyclohexanone, caprolactam and other products. Excellent solvent for bitumen and rubber. More than 90% of cyclohexane comes from the hydrogenation of benzene, and its production technology is relatively mature. Commonly used catalysts include nickel, platinum, palladium, etc. Among them, the nickel-aluminum system catalyst has good activity and relatively low price It is widely used in industrial equipment. [0003] Chinese Patent Publication No. CN 101757917A discloses a low-nickel content benzene hydrogenation catalyst and its preparation method. The catalyst uses nickel oxide as the ...

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Problems solved by technology

[0003] Chinese Patent Publication No. CN 101757917A discloses a low-nickel content benzene hydrogenation catalyst and its preparation method. The catalyst uses nickel oxide as the main active component and aluminum oxide as the carrier, and is added to carbonates and rare earth oxides. One or more of them are additives, composition: nickel oxide is 5-30wt%, Al 2 o 3 50-90wt%, additives: 0.1-4.0wt%; the catalyst adopts the impregnation method, using Al2O3 raw materials, adding additives, through mixing and milling, granulation, tableting, and high-temperature roasting to obtain the carrier, and the carrier is impregnated by impregnation Active component; compared with the existing benzene hydrogenation catalyst, the nickel content of the catalyst is greatly reduced, with high strength, low bulk density, wide operating temperature range, good heat resistance activity, and under the same reaction conditions cyclohexane Higher selectivity; but the preparation method of the invention is complicated, and the prepared benzene hydrogenation catalyst has poor water resistance

[0004] Chinese Patent Publication No. CN104258900A discloses a method for preparing and using a coking benzene hydrodesulfurization catalyst, wherein the preparation process of the hydrodesulfurization catalyst used in the hydrodesulfurization reaction is as follows: adding aluminum oxide and titanium dioxide mixed powder carriers to the carrier containing molybdenum , nickel, cobalt, tungsten active metal element solution for impregnation, the solution contains citric acid; NaZSM-5 molecular sieve is added to the solution containing copper and / or zinc for impregnation; after drying and roasting, mix the two, coking benzene Before hydrodesulfurization, it is first treated in a rectification tower, and then the sulfur removal is completed through pre-hydrogenation, main hydrogenation and inorganic sulfur removal; the NaZSM-5 molecular sieve loaded with active components has a selective adsorption effect on thiophene; the loaded activity The mixed powder of aluminum oxide and titanium dioxide of the metal has a good catalytic hydrogenation effect on thiophene; but the preparation method of the invention is complicated, and the prepared catalyst has poor anti-poisoning performance and anti-coking performance

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