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A modified catalyst and its preparation method and application

A catalyst and modification technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low xylene selectivity

Active Publication Date: 2020-07-28
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although toluene disproportionation and aromatics transalkylation have become the main processes to increase xylene production, the problem of low xylene selectivity generally exists

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The present invention also provides a kind of preparation method of modified catalyst, comprises the following steps:

[0027] Ion-exchange the aluminosilicate in an ammonium salt solution to obtain an ion-exchange product;

[0028] molding the mixture comprising the ion exchange product and the binder in an acid solution to obtain a shaped product;

[0029] The shaped product is calcined to obtain a modified catalyst.

[0030] In the invention, the aluminosilicate is ion-exchanged in an ammonium salt solution to obtain an ion-exchange product. In the present invention, the chemical composition of the aluminosilicate preferably includes SiO 2 and Al 2 o 3 , the SiO 2 and Al 2 o 3 The ratio of the amount of the substance is preferably (10~60):1, more preferably (20~50):1, most preferably (30~40):1.

[0031] In the present invention, the aluminosilicate is preferably a mixture of ZSM-5 zeolite, Beta zeolite, Y zeolite, mordenite, MCM-22 zeolite, EU-1 zeolite and Z...

Embodiment 1

[0050] The aluminosilicate containing mordenite and ZSM-5 zeolite (mass ratio 1:1) was exchanged twice in ammonium nitrate (1 mol / L) solution at 80°C (liquid-solid ratio 50:1mL / g) to obtain ion exchange product. The ion exchange product and the inorganic oxide Al 2 o 3 Mix evenly at a mass ratio of 1:1, knead in a hydrochloric acid solution with a concentration of 10wt%, and extrude. After drying at 105°C for 12 hours and calcining at 500°C for 3 hours, it was crushed into 20-40 mesh particles to obtain a modified catalyst. Take 1 g of the modified catalyst and put it into a fixed-bed reactor for transalkylation reaction. The molar ratio of hydrogen to the reactant is 4, the system pressure is 3 MPa, and the temperature is raised to 450 ° C for 3 hours after activation. -1 Feed material: Toluene and trimethylbenzene (1:1 molar ratio) are raw materials.

[0051] The liquid product was taken after 6 hours of reaction, and its composition was analyzed by gas chromatography. T...

Embodiment 2

[0053] The aluminosilicate containing mordenite and ZSM-5 zeolite (mass ratio 1:1) was exchanged twice in ammonium nitrate (1 mol / L) solution at 80°C (liquid-solid ratio 50:1mL / g) to obtain ion exchange product. The ion exchange product and the inorganic oxide Al 2 o 3 Mix evenly at a mass ratio of 1:1, knead in a nitric acid solution with a concentration of 20wt%, and extrude. After drying at 105°C for 12 hours and calcining at 500°C for 3 hours, it was crushed into 20-40 mesh particles to obtain a modified catalyst.

[0054] Take 1 g of the modified catalyst and put it into a fixed-bed reactor for transalkylation reaction. The molar ratio of hydrogen to the reactant is 4, the system pressure is 3 MPa, and the temperature is raised to 450 ° C for 3 hours after activation. -1 Feed, toluene and trimethylbenzene (1:1 molar ratio) are raw materials.

[0055] The liquid product after 6 hours of reaction was taken, and its composition was analyzed by gas chromatography. The co...

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Abstract

The invention provides a modified catalyst. Aluminum silicate is subjected to ion exchange in ammonium salt solution to obtain an ion exchange product, the ion exchange product and adhesive mixture is formed in acid liquor to obtain a formed product, and the formed product is baked to obtain the modified catalyst. The modified catalyst prepared by the preparation method is high in acidity, isomerization of C9 aromatics can be inhibited when the modified catalyst is used for catalyzing methylbenzene and the C9 aromatics to perform transalkylation reaction to prepare xylene, and finally, the modified catalyst has high selectivity for the xylene. Results indicate that the highest selectivity of the modified catalyst for the xylene can reach 68.61%.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a modified catalyst and its preparation method and application. Background technique [0002] Paraxylene (PX) is an important organic raw material in the petrochemical industry, and its demand is increasing with the development of the economy. At present, p-xylene mainly comes from catalytic reforming of petroleum fractions to produce oil and pyrolysis gasoline. In addition, methanol to aromatics technology is also one of its important sources. [0003] The output of p-xylene obtained by the above method is limited and cannot meet the market demand. Toluene disproportionation and aromatics transalkylation technology converts cheap and surplus toluene and trimethylbenzene (carbon nine aromatics) obtained by various aromatics industries into mixed xylene and benzene, and increases the production of p-xylene with higher added value. An important method of mutual transformation....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80C07C6/12C07C15/08
CPCB01J29/18B01J29/40B01J29/80C07C6/126C07C15/08Y02P20/52
Inventor 董梅李艳春王浩樊卫斌王建国秦张峰李俊汾
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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