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Catalyst for producing p-xylene from vanadium-based diisobutylene, its preparation method and application

A technology of xylene catalyst and vanadium-based diisobutylene, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high cost of platinum-based catalysts, environmental protection and Health hazards and other issues, to achieve ideal raw material conversion rate, easy to scale production, high activity effect

Active Publication Date: 2019-03-29
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these documents, chromium-based or platinum-based catalysts are mostly used in the process of converting diisobutylene into p-xylene, but chromium-based catalysts are potentially harmful to the environment and health, and the cost of platinum-based catalysts is very high

Method used

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  • Catalyst for producing p-xylene from vanadium-based diisobutylene, its preparation method and application
  • Catalyst for producing p-xylene from vanadium-based diisobutylene, its preparation method and application
  • Catalyst for producing p-xylene from vanadium-based diisobutylene, its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0038] The preparation of embodiment 1V-K-Al-O catalyst comprises:

[0039] Take 0.2g of potassium nitrate and 10g of deionized water to prepare a solution, drop the potassium nitrate solution into 450g of alumina sol with a mass fraction of 20%, stir for 10h and dry, and calcinate in air atmosphere at 550°C for 5h to obtain solid A; take 3g Potassium metavanadate, 3g ammonium metavanadate and 370g deionized water to prepare a solution, add the solid A obtained by calcining to the solution containing vanadium salt, stir for 10h, after drying, calcinate in air atmosphere at 350°C for 20h, after purging with nitrogen , heated to 400°C, switched to 50vol% H 2 (volume fraction) of hydrogen-nitrogen mixed gas is processed after 0.5h to obtain the vanadium-based diisobutylene system p-xylene catalyst, the catalyst is denoted as FLX-1, and through X-ray fluorescence spectrometry analysis, wherein the mass fraction of the V element is 3.87%, K 2 O is 1.12%, the total mass fraction o...

Embodiment 2

[0040] The preparation of embodiment 2V-Na-Al-O catalyst comprises:

[0041] Take 2g of sodium nitrate and 200g of deionized water to prepare a solution, mix 115g of powdered pseudo-boehmite into the sodium nitrate solution, stir for 10h and dry, and calcinate in air atmosphere at 600°C for 1h to obtain solid A; take 1g of metavanadium Sodium metavanadate, 7g ammonium metavanadate and 300g deionized water to prepare a solution, add the calcined solid A to the sodium metavanadate solution, stir for 100h, after drying, calcinate at 500°C for 8h in the air atmosphere, after purging with nitrogen, maintain Temperature 500°C, switch contains 50vol% H 2 (volume fraction) of hydrogen-nitrogen mixed gas is processed for 1h to obtain a vanadium-based diisobutylene-made p-xylene catalyst, the catalyst is denoted as FLX-2, and through X-ray fluorescence spectrometry analysis, the mass fraction of V element is 3.78%, and Na 2 O is 1.05%, the total amount of impurities such as Si, S, P, F...

Embodiment 3

[0042] The preparation of embodiment 3V-Ba-Al-O catalyst comprises:

[0043] Get 0.5g barium nitrate and 200g deionized water preparation solution, 116g powdery aluminum hydroxide Al(OH) 3 Add it to the barium nitrate solution, stir for 12 hours and dry it, then calcinate it in the air atmosphere at 520°C for 5 hours to obtain solid A; take 18g ammonium metavanadate and 200g deionized water to prepare a solution, and add the calcined solid A to the ammonium metavanadate solution , stirred for 24h, after drying, calcined at 550°C for 10h in an air atmosphere, after purging with nitrogen, maintained the temperature at 550°C, switched to contain 5vol%H 2 (volume fraction) of hydrogen-nitrogen mixed gas was processed for 4h to obtain a vanadium-based diisobutylene system p-xylene catalyst, the catalyst was denoted as FLX-3, analyzed by X-ray fluorescence spectrometry, wherein the mass fraction of the V element was 9.15%, BaO 0.17%, the total amount of impurities such as Ca, Si, S...

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Abstract

The invention discloses a vanadium-based catalyst for preparing p-xylene from diisobutene, and a preparation method and an application thereof. The catalyst has a catalytic active component structure represented by the following formula: (VOx)a(AyO)b(Al2O3)1-a-b, wherein a and b are the corresponding component mass fractions; the value of x is associated with the valence of V, for example, for divalent vanadium, x is 1, for trivalent vanadium, x is 1.5, for tetravalent vanadium, x is 2, and for pentavalent vanadium, x is 2.5; A is at least selected from any one of alkali metal elements Na, K, Rb and Cs and alkaline earth metal elements Mg, Ca and Ba; y is associated with the valence of A, for alkali metals, y is 2, and for alkaline earth metals, y is 1; and a=0.01-0.3, and b=0.001-0.05. The invention provides the vanadium-based catalyst containing no chromium or precious metal platinum, wherein the vanadium-based catalyst has the advantages of being cheap, stable, green and pollution-free and the like; at the same time, the preparation process is simple, and is easy to scale production; and moreover, the catalyst has relatively high activity and relatively ideal conversion rate of raw materials in application, and also has high selectivity on the target product p-xylene.

Description

technical field [0001] The invention relates to a heterogeneous catalyst and its preparation process, in particular to a vanadium-based heterogeneous catalyst for preparing p-xylene from diisobutylene with high selectivity, its preparation process and application, and belongs to the technical field of heterogeneous catalysis. Background technique [0002] Paraxylene (PX) is an important organic chemical raw material, which can be used in the production of synthetic fibers, paints, dyes and pesticides. , the industry demand is huge [0003] At present, the commonly used PX industrial production methods mainly include disproportionation and transalkylation, xylene isomerization, xylene adsorption separation and xylene separation. But these traditional crafts all have some defects more or less. For example, the products are generally mixed C 8 Aromatics, containing multiple isomers, low p-xylene yield; mixed C 8 The various isomers in aromatic hydrocarbons have similar chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22C07C15/08C07C5/41
CPCY02P20/52
Inventor 朱刚利宋焕玲夏春谷赵峰王丹
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI