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Preparation method of catalyst for 2-alkyl anthraqunone and anthraqunone production

A technology of alkyl anthraquinone and catalyst, applied in the field of catalyst preparation, can solve the problems of low selectivity, unsatisfactory yield, low conversion rate of 2-(benzoyl) benzoic acid, etc. Friendly, easy-to-use effects

Inactive Publication Date: 2006-12-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output of 2-alkylanthraquinone and anthraquinone can no longer meet the growing demand
But the disadvantage is that the conversion rate of 2-(benzoyl)benzoic acid is low, and the selectivity of anthraquinone is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The original powder of beta zeolite molecular sieve is exchanged for acidic beta zeolite molecular sieve. Weigh 40 grams of beta zeolite molecular sieve raw powder into a three-neck flask, then add 200ml of 0.4mol / L ammonium nitrate, exchange for two hours at 80°C, exchange twice, dry after exchange, and then put it into a muffle furnace Calcined at 550°C for 4 hours to obtain acidic beta zeolite molecular sieve A.

Embodiment 2

[0037] The acidic beta zeolite molecular sieve A prepared in Example 1 was modified for the second time. Take by weighing 10 grams of acidic beta zeolite molecular sieves prepared in Example 1 and pack into a three-necked flask, then add 50ml of 0.5mol / L citric acid, exchange at 80°C for two hours, exchange twice, dry after exchange, and then Put it into a muffle furnace and bake at 550° C. for 4 hours to obtain a modified acidic beta zeolite molecular sieve B.

Embodiment 3

[0039] At room temperature, 1.0 g of catalyst B prepared in Example 2 was added into the reaction vessel, and after reaching 256° C., 3.5 g of 2-(4′-ethylbenzoyl)benzoic acid was added into the reaction vessel. After the addition, react for 40 minutes. After cooling slightly, 1,4-dioxane solvent was added thereto. The catalyst was separated by centrifugation, and the resulting reaction solution was analyzed by liquid chromatography. The conversion rate of 2-(4'-ethylbenzoyl)benzoic acid was 99.5%, and the selectivity of 2-ethylanthraquinone was 99.2%.

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PUM

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Abstract

The invention relates to a method for preparing the catalyst used to produce 2-alkyl-anthraquinone and anthraquinone, wherein with said catalyst, 2-(4'- benzoylmethane) benzene carbonic acid is dewatered and closed, to obtain the pure anthraquinone; used solid acid catalyst is the modified acid beta zeolite molecular screen; under the best reaction condition, the transform rate of 2-(4'- benzoylmethane) benzene carbonic acid can reach 99.5%; the selectivity of 2-alkyl-anthraquinone can reach 99.2%.

Description

technical field [0001] The invention belongs to the technical field of synthetic chemical engineering. In particular, it relates to the preparation of a catalyst for the synthesis of 2-alkylanthraquinones and the production of anthraquinones. Background technique [0002] Beta zeolite molecular sieve is a highly stacked defect zeolite molecular sieve composed of tetragonal and monoclinic systems. It has three-dimensional twelve-membered ring channels, and has good hydrothermal stability and anti-coking ability. At present, the catalytic properties of beta zeolite molecular sieves, such as hydrocarbon cracking and isomerization, disproportionation of toluene, alkylation transfer of polytoluene, and disproportionation of macromolecular naphthalene, have been extensively studied. E.Santacesaria et al. reported in Catalysis Today 66.(2001) 167-174 that 2-(benzoyl)benzoic acid was used as a raw material, and the beta zeolite molecular sieve after one-step acid exchange was used ...

Claims

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Application Information

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IPC IPC(8): B01J29/06C07C46/00C07C50/18
Inventor 郭新闻徐仁顺王桂茹刘靖
Owner DALIAN UNIV OF TECH
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