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Modified extruded catalyst used for alkylation reaction, and preparation method and application thereof

An alkylation reaction and catalyst technology, which is applied in the field of modified catalysts, can solve the problems of reducing the activity of molecular sieves and lack of practicability, and achieve the effects of good shape selection, reduced template dosage, and high catalytic activity

Inactive Publication Date: 2017-04-26
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these modification methods using coverage or poisoning will greatly reduce the activity of molecular sieves while improving product selectivity because they cover a large number of active centers.
[0008] The literature "Advanced Materials 2005,17,1985-1988" and the literature "Journal of Catalysis 2006,243,389-394" and CN102671694A all mentioned a method of using Silicate-1 molecular sieve to modify the surface of the catalyst powder to improve the selection of p-xylene However, because industrial catalysts all need to use higher pressure to shape the catalyst raw powder, a large amount of HZSM-5 crystals whose surface is covered will be broken during the molding process, which will lead to these problems again. The acid sites of toluene isomerization are exposed, so this treatment method is not practical for industrial applications

Method used

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  • Modified extruded catalyst used for alkylation reaction, and preparation method and application thereof
  • Modified extruded catalyst used for alkylation reaction, and preparation method and application thereof

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Embodiment approach

[0029] According to one embodiment of the present invention, the shaped body comprises: a substance whose precursor is a binder and the alkylation reactive component, wherein the content of the substance whose precursor is a binder and the alkylation The content of the reactive components can be known in the art. For the present invention, the content of the precursor is preferably 10% by weight-50% by weight, and the content of the alkylation reactive component is 50% by weight. -90% by weight.

[0030] According to the present invention, the substance whose precursor is a binder refers to that it is used as a binder during the molding process, and after the final roasting to obtain a molded body, the binder is converted into an oxide, that is, the binder used in the present invention The precursor is the substance of the binder.

[0031] According to the present invention, the type of the substance whose precursor is the binder is well known in the art, for example, it may ...

Embodiment 1

[0055] (1) Take the commercialized HZSM-5 (Si / Al (molar ratio)=60), press it to 30MPa in a tablet press, then crush and sieve into 20-40 mesh samples;

[0056] (2) 5 grams of molding samples in step (1) are mixed with 22 grams of tetraethyl orthosilicate, 21.6 grams of TPAOH solution (25wt% aqueous solution), 19.5 grams of ethanol and 100 grams of water, and 160 grams of water in a self-pressure crystallization kettle ℃ crystallization for 72 hours;

[0057] (3) Filter the crystallized sample in step (2), wash it with deionized water until neutral, and then dry it in an oven at 120°C for 2 hours;

[0058] (4) Place the sample obtained in step (3) in a muffle furnace, raise it from room temperature to 550°C at 2K / min in a flowing air atmosphere, and then bake at a constant temperature of 550°C for 5 hours and naturally cool to room temperature to obtain the finished product Catalyst (film thickness is 0.5μm);

[0059] (5) 1.2 grams of finished catalysts are heated at normal p...

Embodiment 2

[0061] (1) with step (1) in embodiment 1;

[0062] (2) 2.5 grams of molding samples in step (1) are mixed with 22 grams of tetraethyl orthosilicate, 21.6 grams of TPAOH solution (25wt% aqueous solution), 19.5 grams of ethanol and 100 grams of water. ℃ crystallization for 72 hours;

[0063] (3) with step (3) in embodiment 1;

[0064] (4) with step (4) in embodiment 1, obtain finished product catalyst (film thickness is 0.8 μ m);

[0065] (5) 1.2 grams of finished catalysts are heated at normal pressure, 470°C, toluene / methanol (mol / mol)=6, H 2 / toluene (mol / mol)=2, space velocity 6h -1 Under the condition of reaction, the conversion rate of toluene is 12.5%, and the p-xylene yield per kilogram of catalyst per hour is 301 grams.

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Abstract

The invention relates to the field of alkylation catalysts, and concretely provides a modified extruded catalyst used for an alkylation reaction. The catalyst comprises a formed body and a molecular sieve membrane wrapping the surface of the formed body, the molecular sieve membrane has a shape selective effect on the alkylation reaction and is not reactive, and the formed body comprises an alkylation reaction active component. The invention also provides a preparation method of the catalyst. The method comprises the following steps: mixing raw materials of the molecular sieve membrane having a shape selective effect on the alkylation reaction and being not reactive with the formed body, crystallizing the obtained mixture, separating a solid from obtained crystallization liquid, and roasting the solid after or without drying, wherein the formed body comprises the alkylation reaction active component. The invention further provides an application of the catalyst in the alkylation reaction, such as a toluene alkylation reaction. The catalyst has the advantages of good shape selection effect, high target product yield and high catalysis activity.

Description

technical field [0001] The invention relates to a modified shaped catalyst for alkylation reaction, a preparation method of the modified shaped catalyst used for alkylation reaction, and a modified shaped catalyst used for alkylation reaction The application in the reaction of alkylation, and the application of the modified shaped catalyst for the alkylation reaction in the alkylation reaction of toluene. [0002] technical background [0003] P-xylene (p-xylene, PX) is an important chemical raw material commonly used in industry, and most of p-xylene is used to produce terephthalic acid, which is then used to produce chemical products such as polyester fiber. [0004] As a raw material, the demand for p-xylene has been growing rapidly in recent years. In 2011, the production capacity of PX was about 8.7 million tons, while the demand for PX was 13 million tons; in 2012, the production capacity of PX was about 11 million tons, while the demand for PX was 19.1 million tons. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C2/86C07C15/08
CPCY02P20/52
Inventor 王传付张琪朱豫飞金环年
Owner CHNA ENERGY INVESTMENT CORP LTD
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