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Heavy arenes catalytic dealkylation catalyst and preparing method thereof

A catalytic dealkylation and catalyst technology for aromatic hydrocarbons, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of catalyst loading and reaction operation control complexity, etc., to improve activity stability and reduce carbon deposition The effect of reducing and increasing productivity

Inactive Publication Date: 2004-02-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this method is relatively cumbersome in terms of catalyst loading and reaction operation control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of catalyst of the present invention comprises:

[0020] (1) Mix the sodium type ZSM-5 zeolite, β zeolite and alumina hydrate in a weight ratio on a dry basis, and then knead, shape and roast to obtain a composite carrier,

[0021] (2) ion-exchange the composite carrier with an aqueous ammonium salt solution, so that the degree of sodium ion exchange in the carrier is at least 90%, and then wash,

[0022] (3) Formulating an impregnating solution with a group VIII metal compound, impregnating the ammonium-exchanged support, drying and calcining.

[0023] The step (1) of the above method is the preparation of the composite carrier, which is to mix the sodium-type ZSM-5 zeolite and beta zeolite with alumina hydrate in a predetermined proportion, and then add 25-60% of the weight of the mixed powder, preferably 35-45% The nitric acid aqueous solution with a concentration of 1 to 5% by weight, preferably 1.5 to 3.0% by weight is kneaded and molded, an...

example 1～6

[0031] Preparation of the catalyst of the present invention.

[0032] (1) Preparation of composite carrier

[0033] Combine an appropriate amount of sodium-type ZSM-5 zeolite (produced by Shanghai No. Mix alumina powder, add 40% by weight of powder, and 2% nitric acid aqueous solution, knead, extrude, dry at 110-120°C for 2 hours, and roast at 550°C in air for 4 hours to obtain a composite carrier.

[0034] (2) Ammonium exchange

[0035] Take 10 grams of the above-mentioned composite carrier, and use 0.5N NH at 90±10°C 4 20 ml of Cl solution was used to ion-exchange the carrier for 2 hours, filtered, and washed with deionized water until Cl-free - .

[0036] (3) Introduce metal components

[0037] Predetermined amounts of the precursors of each metal component were prepared as an impregnating solution, and the above ammonium ion-exchanged carrier was impregnated at room temperature with a liquid-solid ratio of 2 for 24 hours, filtered, dried at 110-120°C for 2 hours, and ...

example 7

[0043] Catalysts A to F of the present invention and comparative catalysts were evaluated.

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Abstract

A catalyst for catalytic dealkylation of heavy arylhydrocarbon contains the metal in VIII family and composite carrier including ZSM-5 zeolite, beta-zeolite and alumina. It can increase the transform rate of C9 acrylhydrocarbon and output rate of xylene, and decrease carbon deposit.

Description

technical field [0001] The invention relates to a heavy aromatic hydrocarbon catalytic dealkylation catalyst and a preparation method thereof. Specifically, it is a catalyst containing aluminosilicate zeolite and noble metal components, which is suitable for catalytic dealkylation of heavy aromatics with more than nine carbon atoms for lightening to produce benzene, toluene and xylene (BTX) and its preparation method. Background technique [0002] Heavy aromatics generally refer to catalytic reforming, disproportionation and isomerization reactions to generate oil and C contained in ethylene cracking hydrogenated gasoline 9 ~C 16 mono- and bicycloalkylaromatics. Heavy aromatics resources have not been rationally utilized for a long time, except for a small amount used as solvent and extraction of C 9 or C 10 Except for monomeric aromatics, they are basically blended into fuel for use. With the increasing improvement of environmental regulations, the content of heavy ar...

Claims

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Application Information

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IPC IPC(8): B01J29/04C07C4/18
Inventor 王建伟刘中勋梁战桥金星花李艳秀桂寿喜
Owner CHINA PETROLEUM & CHEM CORP
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