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Hydrogen type ZSM-35/EU-1 eutectic zeolite, aromatic isomerization catalyst, preparation method and application

A ZSM-35, eutectic zeolite technology, applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problem of high non-aromatic hydrocarbon content, affecting the yield and energy consumption of aromatic hydrocarbon complexes, and reducing the purity of benzene And other issues

Active Publication Date: 2021-02-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The C8 arene isomerization catalyst using zeolite as the acidic component and Group VIII noble metal as the metal component has been applied industrially, showing good catalytic performance, but there is still a problem of mismatch between the acidic active center and the metal active center
In the ethylbenzene dealkylation type C8 aromatics isomerization catalyst, even if the Group VIII noble metal content is controlled below 0.05%, there will be a problem of high non-aromatic hydrocarbon content that azeotropes with benzene, reducing the azeotropic concentration of benzene at a low boiling point. Purity in Boilers Affects Yield and Energy Consumption in Aromatics Complexes

Method used

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  • Hydrogen type ZSM-35/EU-1 eutectic zeolite, aromatic isomerization catalyst, preparation method and application
  • Hydrogen type ZSM-35/EU-1 eutectic zeolite, aromatic isomerization catalyst, preparation method and application
  • Hydrogen type ZSM-35/EU-1 eutectic zeolite, aromatic isomerization catalyst, preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Add the EU-1 zeolite into the NaOH solution, stir evenly, then add ethylenediammonium, silica sol, silica-alumina microspheres and water, and stir evenly. Transfer the solution to a stainless steel kettle, take it out after crystallization at 200°C for 20 hours, wash it with water until neutral after cooling to room temperature, and dry it at 100°C after suction filtration to obtain different SiO 2 / Al 2 o 3 The ZSM-35 / EU-1 eutectic zeolite.

Embodiment 2

[0075] Add the EU-1 zeolite into the NaOH solution, stir evenly, then add pyrrolidine, butanediammonium, silica sol and water, and stir evenly. Transfer the solution to a stainless steel kettle, take it out after crystallization at 220°C for 18 hours, cool to room temperature, wash with water until neutral, and dry at 100°C after suction filtration to obtain different SiO 2 / Al 2 o 3 The ZSM-35 / EU-1 eutectic zeolite.

[0076] Catalyst preparation

Embodiment 3

[0078] Containing 80.0w% ZSM-35 / EU-1 eutectic zeolite (SiO 2 / Al 2 o 3 =15), 3.0w% Re, 17.0w% alumina, catalyst C3.

[0079] SiO synthesized in embodiment 1 2 / Al 2 o 3 100 ZSM-35 / EU-1 eutectic zeolite, fully mixed with pseudo-boehmite powder, added 3.0w% nitric acid solution and mixed evenly, extruded into strips using cylindrical orifice; cylindrical strips at room temperature After standing for 4 hours, dry at 120°C for 2 hours, and bake at 500°C in the air for 4 hours to make a catalyst support; -1 In the ammonium chloride solution, exchange at 60-90°C for 2 hours, wash with deionized water, and filter; the exchanged support is immersed in a solution containing ammonium perrhenate for 12 hours at room temperature, and then dried at 120°C Calcined at 500°C for 2 hours for 4 hours, and reduced in hydrogen at 500°C for 4 hours to prepare catalyst C3.

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Abstract

The invention relates to a hydrogen type ZSM-35 / EU-1 eutectic zeolite, an aromatic isomerization catalyst containing the eutectic zeolite, a preparation method and applications thereof, the zeolite isprepared by the following steps: 1) adding a certain amount of EU-1 zeolite to a NaOH solution, uniformly stirring, adding a template agent, a silicon source and water, and uniformly stirring; and 2)transferring the solution to a stainless steel kettle, crystallizing at 100-300 DEG C for 12-36 hours, taking out, cooling to room temperature, washing with water to neutrality, carrying out suctionfiltration, and drying to obtain the ZSM-35 / EU-1 eutectic zeolite. The aromatic isomerization catalyst is prepared from the following components in percentage by weight: 10.0 to 80.0 percent of hydrogen type ZSM-35 / EU-1 eutectic zeolite, 15.0 to 90.0 percent of binding agent and 0.1 to 5.0 percent of VIIB group metal rhenium in the periodic table of elements. The catalyst can be applied to an ethylbenzene dealkylation type C8 aromatic hydrocarbon isomerization catalytic reaction process, and hydrogenation side reactions after ethylbenzene dealkylation are effectively reduced.

Description

technical field [0001] The invention relates to an aromatic hydrocarbon isomerization catalyst. It can be applied to the xylene isomerization unit of the aromatics complex, isomerize the raffinate after separating the target product p-xylene (or o-xylene) into a product of xylene close to thermodynamic equilibrium, and at the same time part of the raw material Ethylbenzene is converted to benzene. Background technique [0002] Since the boiling point of ethylbenzene is only 2.2°C different from that of PX, it is very difficult and uneconomical to separate ethylbenzene from xylene by rectification. Therefore, ethylbenzene must be converted during the xylene isomerization process. According to the different ways of ethylbenzene conversion, industrial C8 aromatics isomerization technology can be divided into two types: ethylbenzene conversion type and ethylbenzene dealkylation type. Ethylbenzene dealkylation-type C8 aromatics isomerization technology can reduce the investment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C01B39/04B01J29/80B01J37/02B01J37/18B01J37/30C10G45/60
CPCC01B39/023C01B39/04B01J29/80B01J37/30B01J37/0201B01J37/18C10G45/60B01J29/65B01J29/7023B01J2229/183Y02P20/52
Inventor 张上桂鹏龚奇菡胡长禄吕雉韩晓琳张鹏潘晖华崔佳李知春常玉红
Owner PETROCHINA CO LTD