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Catalyst for one-step preparation of 2,6-dimethylnaphthalene from synthesis gas and 2-methylnaphthalene

A technology of dimethylnaphthalene and catalysts, which is applied in the direction of carbon compound catalysts, catalysts, molecular sieve catalysts, etc., can solve the problems of high cost of synthesis technology, achieve the effects of improving diffusion efficiency, shortening diffusion residence time, and increasing yield

Inactive Publication Date: 2020-01-17
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of synthesis gas and 2-methylnaphthalene one-step preparation catalyzer of 2,6-dimethylnaphthalene, to solve the existing 2,6-dimethylnaphthalene synthetic technology cost high of proposing in the background technology The problem

Method used

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  • Catalyst for one-step preparation of 2,6-dimethylnaphthalene from synthesis gas and 2-methylnaphthalene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Take 14g of EU-1 / ZSM-23 mixed crystal molecular sieve with a silicon-aluminum atom molar ratio of 100 and a needle-like crystal section diameter of 10nm, mix with 6g of alumina binder, stir well, and add an appropriate amount of dilute nitric acid dropwise Kneading and extruding into strips, drying at room temperature, and calcining at 500° C. for 1 hour to obtain a strip-shaped catalyst with a cross-sectional diameter of 1.5 mm. Then the above-mentioned shaped unmodified catalyst particles were excessively impregnated in a certain concentration of copper nitrate solution for 12 hours, and the loading capacity of copper oxide was determined to be 2g by the liquid absorption and solution concentration of the unmodified catalyst. drying at 500° C. for 1 hour to obtain a 10 wt % CuO-modified nano needle EU-1 / ZSM-23 mixed crystal molecular sieve catalyst.

[0018] 2) Put 5 g of the above copper oxide-modified nanoacicular EU-1 / ZSM-23 mixed crystal molecular sieve catalys...

Embodiment 2

[0020] 1) Weigh 19g of EU-1 / ZSM-23 mixed crystal molecular sieve with a silicon-aluminum atomic molar ratio of 300 and acicular crystal section diameter of 3nm, mix it with 1g of silica binder, roll into a ball, and dry at room temperature Then, it was calcined at 500° C. for 1 hour to obtain spherical catalyst particles with a diameter of 1.5 mm. Then above-mentioned gained forming unmodified catalyst successively successively respectively in the nickel nitrate aqueous solution of certain concentration, ferric nitrate aqueous solution and chloroplatinic acid aqueous solution excessive impregnation 12 hours, determine nickel oxide, The loads of iron oxide and platinum oxide were 1.8g, 2g and 0.1g, respectively, and the impregnated samples were dried at 120°C for 6 hours and then calcined at 500°C for 1 hour. Finally, a nanoacicular EU-1 / ZSM-23 mixed crystal molecular sieve catalyst compositely modified with 9wt% nickel oxide, 10wt% iron oxide and 0.5wt% platinum oxide was prep...

Embodiment 3

[0023] 1) Weigh 16g of EU-1 / ZSM-23 mixed crystal molecular sieve with a silicon-aluminum atomic molar ratio of 2 and acicular crystal cut-off surface diameter of 200nm, and prepare a slurry with 4g of silica binder and water, and form it by spray drying Microsphere particles with a particle size distribution of 50-100um are calcined at 500°C for 1 hour. Then the unmodified catalyst of above-mentioned gained shaping is successively respectively in the zinc nitrate aqueous solution of certain concentration, cobalt nitrate aqueous solution and palladium chloride aqueous solution excessive impregnation 12 hours successively, determine zinc oxide, zinc oxide, The loads of cobalt oxide and palladium oxide were 0.1 g, 0.08 g, and 0.02 g, respectively, and the impregnated samples were dried at 120°C for 6 hours and then calcined at 500°C for 1 hour. Finally, a nanoacicular EU-1 / ZSM-23 mixed crystal molecular sieve catalyst compositely modified with 0.5wt% zinc oxide, 0.4wt% cobalt oxi...

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Abstract

The invention relates to a catalyst for one-step preparation of 2,6-dimethylnaphthalene from synthesis gas and 2-methylnaphthalene, wherein the catalyst comprises 70-95 wt% of an EU-1 / ZSM-23 mixed crystal molecular sieve of a hydrogen type nanometer needle-like crystal, 5-30 wt% of a binder and an oxide auxiliary agent, and the content of the oxide auxiliary agent is 1-20 wt% of the total weight of the molecular sieve and the binder. Compared with the existing 2,6-dimethylnaphthalene catalytic synthesis technology, the application of the catalyst in the catalytic reaction for one-step preparation of 2,6-dimethylnaphthalene from synthesis gas and 2-methylnaphthalene has the following characteristics that the reaction process is short, the catalytic reaction efficiency is high, and the service life of the catalyst is long, so that the yield of 2,6-dimethylnaphthalene is effectively increased, and the synthesis cost of 2,6-dimethylnaphthalene is reduced.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a catalyst for preparing 2,6-dimethylnaphthalene in one step from synthesis gas and 2-methylnaphthalene. Background technique [0002] 2,6-Dimethylnaphthalene is the raw material for the synthesis of a new type of high-performance polyester material, polyethylene naphthalate, which has excellent heat resistance, mechanical properties, chemical stability, gas barrier properties, UV resistance and radiation performance. In recent decades, major foreign plastic manufacturers and application companies have invested in the development and production of polyethylene naphthalate, and the synthesis of 2,6-dimethylnaphthalene raw materials is very important. At present, its synthesis methods mainly include preparation of toluene or xylene, extraction from C10 aromatics or coal tar produced in petroleum refining, isomerization of dimethylnaphthalene, and alkylation of naphthalene or met...

Claims

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Application Information

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IPC IPC(8): B01J29/80C07C2/86C07C15/24
CPCB01J29/80C07C2/86B01J29/7646B01J29/7692B01J2229/18C07C2529/80
Inventor 李军辉宋剑红龚清
Owner XIANGTAN UNIV
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