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Nano molecular sieve catalyst for synthesizing paraxylene and preparation method thereof

A nano-molecular sieve and p-xylene technology, which can be used in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems such as poor stability

Active Publication Date: 2009-07-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some literature reports, by modifying the catalyst, the p-xylene selectivity can reach more than 98%, but the stability is very poor

Method used

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  • Nano molecular sieve catalyst for synthesizing paraxylene and preparation method thereof
  • Nano molecular sieve catalyst for synthesizing paraxylene and preparation method thereof
  • Nano molecular sieve catalyst for synthesizing paraxylene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Press catalyst preparation method (1)~(3) of the present invention, adopt nanometer ZSM-5 molecular sieve (grain size is about 100 nanometers, SiO 2 / Al 2 o 3 The molar ratio is 26) to produce Al 2 o 3 The extruded nano-ZSM-5 molecular sieve with mixed rare earth as the carrier has the following composition: 3wt% SiO 2 , 5wt%P 2 o 5 , 3wt% MgO, 15wt% Al 2 o 3 , 10wt% mixed rare earth (mixed rare earth oxide content ≥ 50wt%, La 2 o 3 content ≥ 40%)

[0043] The specific steps are as follows: ① Weigh a certain amount of nanometer NaZSM-5 raw powder, and then weigh 15wt% Al 2 o 3 , 10wt% mixed rare earth, 1wt% safflower powder (the amount of the three is calculated based on the original nano-NaZSM-5 powder) ② Mix the four powders evenly and then use 5% dilute nitric acid to bond and extrude the strips, 120 ° C Drying and roasting at 540°C for 5h (drying and roasting conditions are the same in this example) ③ use 0.5mol / L NH 4 NO 3 The liquid-solid ratio of 5:...

Embodiment 2

[0045] On the basis of catalyst A obtained in embodiment 1, impregnate 10 minutes (SiO 2 The total content is 4wt%), dried at 100°C and calcined at 540°C for 4 hours to prepare catalyst B.

Embodiment 3

[0047] On the basis of catalyst A obtained in embodiment 1, impregnate 10 minutes (SiO 2 The total content is 5wt%), dried at 100°C and calcined at 540°C for 4 hours to prepare catalyst C.

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Abstract

The invention provides a catalyst for synthesizing a nanometer molecular sieve of para-xylene and a method for preparing the same, and mainly overcomes the defects of poor stability and low selectivity on para-xylene in the prior catalyst. In the method, the nanometer molecular sieve as a mother substance, silicon, phosphorus, magnesium and mixed rare earth are modified so as to adjust acid performance and porous channel structure of the catalyst and improve the selectivity of the catalyst, and the metals with hydrogenation function such as noble metals of platinum, palladium, ruthenium, rhodium, iridium, osmium, and the like or transition metals of iron, cobalt, nickel, and the like are modified so as to inhibit the deactivation of carbon accumulation of the catalyst and greatly improve the stability of the catalyst.

Description

technical field [0001] The invention relates to a nanometer molecular sieve catalyst used for the alkylation of toluene and methanol to synthesize p-xylene and a preparation method thereof. Background technique [0002] P-xylene is an important organic chemical raw material, mainly used to synthesize terephthalic acid and dimethyl terephthalate. At present, toluene disproportionation, transalkylation of C9 aromatics, isomerization of mixed xylenes, adsorption separation and cryogenic crystallization separation technologies are mainly used to produce p-xylene in industry. However, the thermodynamic equilibrium composition of p-xylene in mixed xylene is only about 24%, the circulation volume in the process is large, the equipment is huge, and the cost of separating p-xylene from mixed xylene is relatively high, and the total operating cost is relatively high. With the rapid growth of the global demand for polyester, the p-xylene market is in short supply. How to produce high-...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01J29/46B01J29/48B01J29/22B01J29/24B01J29/26C07C15/08C07C2/88
CPCY02P20/52
Inventor 郭新闻赵岩王祥生
Owner DALIAN UNIV OF TECH
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