Alkyl aromatic hydrocarbon non-hydroisomerization catalyst as well as preparation method and application thereof

A technology for alkyl aromatic hydrocarbons and catalysts, applied in the field of non-hydrogen isomerization catalysts for alkyl aromatic hydrocarbons and its preparation, capable of solving problems such as reduced reaction selectivity, achieving high selectivity, energy saving, and high isomerization activity Effect

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In the above patents and documents, the liquid-phase isomerization of xylene has a high activity, but requires a small amount of dissolved hydrogen to maintain the stability of the catalyst, and while achieving high activity, it usually means a reduction in reaction selectivity

Method used

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  • Alkyl aromatic hydrocarbon non-hydroisomerization catalyst as well as preparation method and application thereof
  • Alkyl aromatic hydrocarbon non-hydroisomerization catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069] (1) Preparation of catalyst carrier

[0070] Take SiO 2 / Al 2 o 3 The Na-type ZSM-5 molecular sieve with a molar ratio of 30, its Na 2 The content of O is 0.7 mol%, and it is mixed with alumina powder at a dry basis mass ratio of 70:27. Add 40% of the total mass of the powder with a concentration of 2% nitric acid aqueous solution, knead evenly, extrude, dry at 120°C for 2 hours, and roast at 580°C for 3 hours in air to obtain a catalyst carrier.

[0071] (2) Ion exchange the catalyst carrier

[0072] Get 10 grams of the catalyst carrier that (1) step makes, use the tetraethylammonium chloride aqueous solution of 3 mass % with 20 gram concentrations to carry out ion exchange at 90 ℃ for 2 hours, the solid after ion exchange is washed with deionized water until There is no chlorine ion in the washing liquid, and the catalyst carrier after ion exchange is obtained.

[0073] (3) Preparation of catalyst

[0074]The catalyst support after the ion exchange that (2) ste...

example 2

[0076] (1) Preparation of catalyst precursor

[0077] Take SiO 2 / Al 2 o 3 The Na-type ZSM-5 molecular sieve with a molar ratio of 60, its Na 2 The content of O is 0.7 mol%, and it is mixed with alumina and molybdenum oxide at a dry basis mass ratio of 70:27:3. Add 40% of the total mass of the powder with a concentration of 2% nitric acid aqueous solution, knead evenly, extrude, dry at 120° C. for 2 hours, and roast at 580° C. in air for 3 hours to obtain a catalyst precursor.

[0078] (2) Preparation of catalyst

[0079] Take 10 grams of the catalyst precursor prepared in step (1), and perform ion exchange at 90° C. for 2 hours with 20 grams of tetraethylammonium chloride aqueous solution with a concentration of 3% by mass. Wash the ion-exchanged solid with deionized water until there is no chloride ion in the washing liquid, then dry at 60°C for 6 hours, and roast at 500°C in air for 4 hours to obtain catalyst C-2, wherein the content of hydrogen ZSM-5 molecular sieve ...

example 3

[0081] Catalyst C-3 is prepared by the method for example 1, and difference is that the Na type ZSM-5 molecular sieve used in (1) step is changed into SiO 2 / Al 2 o 3 The Na-type EU-1 molecular sieve with a molar ratio of 30, its Na 2 The O content was 0.2 mol%, and the prepared catalyst C-3 contained 70% by mass of hydrogen-type EU-1 molecular sieve, 3% by mass of molybdenum oxide, and 27% by mass of alumina.

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Abstract

The invention relates to an alkyl aromatic hydrocarbon non-hydroisomerization catalyst as well as a preparation method and application thereof. The quaternary ammonium salt with the molecular size larger than the pore size of the molecular sieve is adopted for conducting ion exchange on the Na-type molecular sieve used by the catalyst, and the prepared catalyst can be used for alkyl aromatic hydrocarbon liquid-phase non-hydroisomerization reaction and has the advantages of being high in isomerization activity, high in para-alkyl aromatic hydrocarbon selectivity and capable of saving energy consumption.

Description

technical field [0001] The invention relates to the field of isomerization of alkyl aromatic hydrocarbons, in particular to a catalyst for non-hydrogen isomerization of alkyl aromatic hydrocarbons and its preparation method and application. Background technique [0002] Xylene isomerization is an important part of the aromatics complex. In recent years, the catalytic activity of the xylene isomerization unit has approached the upper limit of thermodynamic equilibrium. The key to further improving quality and efficiency is to increase the selectivity of the reaction process. [0003] Analysis of the reaction mechanism of xylene isomerization shows that both isomerization and disproportionation are B (Bronsted) acid-catalyzed reactions, and the difference lies in the required pore space and elementary reaction energy barrier. The energy barrier of disproportionation is higher than that of isomerization, therefore, to suppress the side reactions of disproportionation, a lower r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/80B01J31/02B01J37/00B01J37/30B01J37/02B01J37/08C07C5/27C07C15/08
CPCB01J29/48B01J29/80B01J31/0239B01J23/002B01J37/0018B01J37/30B01J37/0207B01J37/088C07C5/2737B01J29/7023B01J29/40C07C2529/48C07C2529/80C07C2531/02C07C15/08Y02P20/52
Inventor 康承琳周震寰刘中勋盖月庭梁战桥阮迟王京岳欣王志强
Owner CHINA PETROLEUM & CHEM CORP
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