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Preparation method of in-process shape-selective catalyst for para-xylene synthesis

A p-xylene and catalyst technology, which is applied in the field of preparation of shape-selective catalysts in the process of synthesizing p-xylene, can solve the problems of cumbersome operation, low shape-selective performance, and high cost, and achieve simple operation, high shape-selective performance, and selectivity Improved effect

Active Publication Date: 2014-08-13
CHANGZHOU XIAOGUO INFORMATION SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a relatively simple synthesis method with relatively low cost and relatively low shape-selective performance for the current problems of cumbersome operation, high cost and low shape-selective performance in improving the shape-selective performance of catalysts. The preparation method of high synthesis p-xylene catalyst

Method used

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  • Preparation method of in-process shape-selective catalyst for para-xylene synthesis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Weigh 0.15g of magnesium nitrate and add it to 3.8mL of absolute ethanol, wherein the mass ratio of magnesium nitrate to absolute ethanol is 1:20. After the magnesium nitrate is completely dissolved, add complexing Ligand 0.19g citric acid, wherein the molar ratio of complex ligand and magnesium nitrate is 1:1, stir evenly, then 5g microporous molecular sieve MCM-22 is added in the above-mentioned solution, magnesium nitrate and microporous molecular sieve The mass ratio is 0.03:1, stirred evenly, dried at room temperature for 24 hours, then dried in a water bath at 75°C, then transferred to a blast drying oven for 6 hours at 110°C, and then baked in a muffle furnace at 10°C / Min was heated to 550°C and kept for 3h to obtain catalyst A;

[0015] (2) Weigh a certain amount of 0.05g magnesium nitrate, add it to 2mL deionized water, wherein the mass ratio of magnesium nitrate to deionized is 1:40, after the magnesium nitrate is completely dissolved, add 5g of the magne...

Embodiment 2

[0017] (1) Weigh 0.15g of magnesium nitrate and add it to 3.8mL of absolute ethanol, wherein the mass ratio of magnesium nitrate to absolute ethanol is 1:20. After the magnesium nitrate is completely dissolved, add complexing Ligand 0.19g citric acid, wherein the molar ratio of complex ligand and magnesium nitrate is 2:1, stir evenly, then 5g microporous molecular sieve MCM-22 is added in the above-mentioned solution, magnesium nitrate and microporous molecular sieve The mass ratio is 0.03:1, stirred evenly, dried at room temperature for 24 hours, then dried in a water bath at 75°C, then transferred to a blast drying oven for 6 hours at 110°C, and then baked in a muffle furnace at 10°C / Min was heated to 550°C and kept for 3h to obtain catalyst A;

[0018] (2) Weigh a certain amount of 0.05g magnesium nitrate, add it to 2mL deionized water, wherein the mass ratio of magnesium nitrate to deionized is 1:40, after the magnesium nitrate is completely dissolved, add 5g of the magne...

Embodiment 3

[0020] (1) Weigh 0.9g of magnesium nitrate and add it to 22.8mL of absolute ethanol, wherein the mass ratio of magnesium nitrate to absolute ethanol is 1:20. After the magnesium nitrate is completely dissolved, add complexing Ligand 1.14g citric acid, wherein the molar ratio of complex ligand and magnesium nitrate is 1:1, stir evenly, then 5g microporous molecular sieve MCM-22 is added in the above-mentioned solution, magnesium nitrate and microporous molecular sieve The mass ratio is 0.18:1, stirred evenly, dried at room temperature for 24 hours, then dried in a water bath at 75°C, then transferred to a blast drying oven for 6 hours at 110°C, and then baked in a muffle furnace at 10°C / Min was heated to 550°C and kept for 3h to obtain catalyst A;

[0021] (2) Weigh a certain amount of 0.25g magnesium nitrate, add it to 10mL deionized water, wherein the mass ratio of magnesium nitrate to deionized is 1:40, after the magnesium nitrate is completely dissolved, add 5g of the magn...

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Abstract

The invention relates to a preparation method of an in-process shape-selective catalyst for para-xylene synthesis. According to the method, a microporous molecular sieve ZSM-5 or MCM-22 is used as the base, and magnesium oxide is loaded on the microporous molecular sieve by combining a complex impregnating method and a common impregnating method. Thus, acid sites on the external surface of the molecular sieve can be completely covered, and the pore dimension of the molecular sieve can be adjusted, so that the shape-selective property of the molecular sieve is improved. The invention has the advantages of simple method, low cost, high shape-selective property and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of petrochemical catalysts, in particular to a preparation method of a shape-selective catalyst used in the process of synthesizing p-xylene. Background technique [0002] P-xylene is an important chemical raw material, and its traditional synthesis method is mainly through the disproportionation process of alkylbenzene, but because the disproportionation process requires a strong acidic catalyst and a high reaction temperature, the catalyst deactivates quickly. In recent years, the synthesis of p-xylene by direct alkylation of toluene has become a research hotspot. [0003] The catalysts commonly used in the alkylation process of toluene are microporous molecular sieves such as ZSM-5 or MCM-22. The alkylation reaction can simultaneously obtain three isomers of ortho, meta, and para dialkylbenzenes, which is mainly due to The p-dialkylbenzene generated during the reaction is easy to undergo i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J29/03C07C15/08C07C2/86
CPCY02P20/52
Inventor 李永昕黄芹薛冰许杰李辉
Owner CHANGZHOU XIAOGUO INFORMATION SERVICES