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Catalyst for preparing paraxylene by methyl alcohol conversion, preparation method thereof and application

A technology for methanol conversion and p-xylene, applied in physical/chemical process catalysts, chemical instruments and methods, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of low market value and complex products

Active Publication Date: 2010-07-07
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The aromatics obtained in the above process of methanol conversion to aromatics are all mixed aromatics, the products are complicated and the market value is low

Method used

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  • Catalyst for preparing paraxylene by methyl alcohol conversion, preparation method thereof and application
  • Catalyst for preparing paraxylene by methyl alcohol conversion, preparation method thereof and application
  • Catalyst for preparing paraxylene by methyl alcohol conversion, preparation method thereof and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, Zn-HZSM-5 zeolite molecular sieve

[0032] 1) ZSM-5 zeolite molecular sieve raw powder (SiO 2 / Al 2 o 3 =61, Fushun Catalyst Factory) was roasted at 550°C to remove the template agent, exchanged 4 times with 0.5 molar equivalent ammonium nitrate solution in a water bath at 80°C, dried in air at 120°C after the exchange, and roasted at 550°C for 3 hours. Obtain HZSM-5 zeolite molecular sieve.

[0033] 2) get step 1) HZSM-5 zeolite molecular sieve 50g prepared, use 10wt% concentration Zn(NO 3 ) 2 The aqueous solution was immersed for 6 hours, dried, and then calcined at 550° C. for 3 hours to obtain a Zn-HZSM-5 zeolite molecular sieve, wherein the Zn loading amount was 3 wt%.

Embodiment 2

[0034] Embodiment 2, Fe-HZSM-5 zeolite molecular sieve

[0035] 1) ZSM-5 zeolite molecular sieve raw powder (SiO 2 / Al 2 o 3 =61, Fushun Catalyst Factory) was roasted at 550°C to remove the template agent, exchanged 4 times with 0.5 molar equivalent ammonium nitrate solution in a water bath at 80°C, dried in air at 120°C after the exchange, and roasted at 550°C for 3 hours. Obtain HZSM-5 zeolite molecular sieve.

[0036] 2) get step 1) HZSM-5 zeolite molecular sieve 50g prepared, use 10wt% concentration Fe(NO 3 ) 3 The aqueous solution was immersed for 10 hours, dried, and then calcined at 550° C. for 3 hours to obtain Fe-HZSM-5 zeolite molecular sieve, wherein the Fe loading amount was 5 wt%.

Embodiment 3

[0037] Embodiment 3, preparation catalyst

[0038] Zn-HZSM-5, Fe-HZSM-5 zeolite molecular sieves obtained in embodiment 1 and embodiment 2 are carried out surface modification using siloxane reagent tetraethyl silicate:

[0039](1) Immerse 10 grams of Zn-HZSM-5 in 20 grams of tetraethyl silicate for 5 hours, pour out the liquid, dry at 120°C, and bake at 550°C for 3 hours to obtain modified Zn-HZSM -5 catalyst, wherein, the mass content of Zn is 2.9%, and the loading amount of tetraethyl silicate calculated as silicon is 4.3% of the total mass of the catalyst. The number is MTAC-01;

[0040] (2) Put 10 grams of Fe-HZSM-5 into 20 grams of tetraethyl silicate and immerse it for 8 hours, pour out the liquid, dry it at 120°C, and bake it at 550°C for 3 hours to obtain the modified Fe-HZSM -5 catalyst, numbered MTAC-02; wherein, the mass content of Fe is 4.8%, and the loading amount of tetraethyl silicate calculated as silicon is 4.6% of the total mass of the catalyst.

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Abstract

The invention discloses a catalyst for preparing paraxylene by methyl alcohol conversion, a preparation method thereof and application. The catalyst provided by the invention is obtained by the method that the surface acidity and the pore structure of a metal modified zeolite molecular sieve are decorated by siloxy group compound; metal content is 0.1-10 wt% of total content of catalyst, and decorated zeolite molecular sieve bearing amount which is accounted by Si is 0.1-8 wt% of total content of catalyst; aromatic hydrocarbon content in obtained hydrocarbon products is more than 60 wt%, the selectivity of paraxylene in aromatic hydrocarbon is more than 85 wt%, and the selectivity of paraxylene in xylene isomers is more than 95 wt%.

Description

technical field [0001] The invention relates to a catalyst for preparing p-xylene with high selectivity of methanol, a preparation method and application thereof. Background technique [0002] Para-xylene is the basic raw material for the synthesis of polyester (PET). At present, p-xylene production mainly uses toluene, C 9 Aromatic hydrocarbons and mixed xylenes are used as raw materials, and are produced through disproportionation, isomerization, adsorption separation or cryogenic separation. Since the p-xylene content in its products is thermodynamically controlled, p-xylene is at C 8 Mixed aromatics only account for about 20%. In the process, the amount of material circulation is large, the equipment is huge, and the operating cost is high. In particular, the difference between the boiling points of the three isomers of xylene is very small, and high-purity p-xylene cannot be obtained by ordinary distillation techniques, but an expensive adsorption separation process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J31/26C07C15/08C07C1/20
CPCY02P20/52
Inventor 许磊刘中民李铭芝张今令张莹袁翠峪欧书能马跃龙金阳肖钢郑长波
Owner CHINA NAT OFFSHORE OIL CORP
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