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A kind of high loading capacity aluminum chloride catalyst and its preparation method and application

A high-load, catalyst technology, used in the chemical industry, can solve problems such as high pressure and inappropriate filling of fine-particle fixed-bed reactors, and achieve the effects of solving material waste, improving catalyst efficiency, and overcoming corrosiveness.

Inactive Publication Date: 2015-11-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prepared supported AlCl 3 / Al 2 o 3 The catalyst has good catalytic activity and selectivity in the low-degree polymerization of isobutene in C4 mixed hydrocarbons, but it is not suitable for fixed-bed reactors packed with fine particles due to excessive pressure drop

Method used

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  • A kind of high loading capacity aluminum chloride catalyst and its preparation method and application
  • A kind of high loading capacity aluminum chloride catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put 15.24g γ-Al 2 o 3 (spherical, diameter 3-5mm, purity ≥99.5wt%, purchased from Sinopharm Chemical Reagent Co., Ltd.) into the first section of the tubular reactor (the material of the tubular reactor is 304 stainless steel, the outer diameter is 25mm, the inner diameter is 19mm, Length 52cm, heated by electric heating furnace). Access to N 2 Protection, flow control at 0.6L / min. After the temperature in the tube rises to 400°C, inject CCl with a constant flow pump 4 Liquid, the flow rate is 0.1ml / min.

[0027] Measure 15.00 g of activated alumina (purchased from Sinopharm Chemical Reagent Co., Ltd.), grind it, and screen out Al with d=250 μm (60 mesh) 2 o 3 Fine particles as carrier (specific surface area: 150-250m 2 / g; Pore volume: 0.3~0.4cm 3 / g; average pore size: 500-800nm). put 12.00gAl 2 o 3 Load it into the second-stage tubular reactor (the material, size and heating method of the second-stage tubular reactor are exactly the same as those of the fi...

Embodiment 2

[0031] 14.89g γ-Al 2 o 3 (spherical, diameter 3-5mm, purity ≥99.5wt%, purchased from Sinopharm Chemical Reagent Co., Ltd.) into the first section of the tubular reactor (the material of the tubular reactor is 304 stainless steel, the outer diameter is 25mm, the inner diameter is 19mm, Length 52cm, heated by electric heating furnace). Access to N 2 Protection, flow control at 0.6L / min. After the temperature in the tube rises to 400°C, inject CCl with a constant flow pump 4 Liquid, the flow rate is 0.1ml / min.

[0032] Measure 15.00 g of activated alumina (purchased from Sinopharm Chemical Reagent Co., Ltd.), grind it, and screen out Al with d=150 μm (100 mesh) 2 o 3 Fine particles as carrier (specific surface area: 150-250m 2 / g; Pore volume: 0.3~0.4cm 3 / g; average pore size: 500-800nm). put 12.00gAl 2 o 3 Load it into the second-stage tubular reactor (the material, size and heating method of the second-stage tubular reactor are exactly the same as those of the first...

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Abstract

The invention discloses an aluminium chloride catalyst with a high load capacity, a preparation method and applications thereof. The preparation method comprises the following steps: grinding ball-shaped active aluminium oxide, selecting aluminium oxide fine particle with a particle size of 60 to 100 meshes as the carrier of the supported aluminium chloride catalyst, subjecting dry CCl4 to carry out reactions with gamma-Al2O3 so as to obtain fresh AlCl3 steam, then using inert gas to carry the fresh AlCl3 steam, and making the fresh AlCl3 steam carry out immobilization reactions with hydroxyl groups on the surface of the aluminium oxide carrier so as to obtain the aluminium chloride catalyst with a high load capacity, wherein the AlClx content is 56 to 72 wt%, and the x is equal to 2.2 to 2.5. The supported aluminium chloride catalyst overcomes the strong corrosivity of aluminium chloride; the load capacity of the catalyst is increased, and the catalyzing efficiency of the catalyst is increased at the same time; and the problems of difficult stirring and material waste because of the large amount of reactants due to low catalyst active group concentration are solved. The catalyst can be used to catalyze the carboxylation reactions between toluene and CO2, the separation yield can reach 73.34% by taking AlClx as the baseline, and the catalyst has a high catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a high-capacity supported aluminum chloride catalyst and a preparation method thereof, in particular to its application in a reaction process with relatively high requirements on the catalyst acid center concentration. technical background [0002] AlCl 3 It is the most important catalyst for Friedel-Crafts reaction, and it has good catalytic performance for reactions such as alkylation, acylation, alkane isomerization, cracking and polymerization. However, since AlCl 3 Catalysts have disadvantages such as strong corrosiveness, high toxicity, difficulty in separating from products, and polluting the environment, which have certain limitations in practical application. AlCl 3 Immobilized on a solid acid carrier with a certain pore structure and surface active hydroxyl groups to prepare a supported AlCl 3 Catalysts can solve the above problems to a certain extent. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/125B01J32/00B01J35/10C07C63/04C07C51/15
Inventor 顾淼飞仙明明钟菊花孙泽能岳志刘鹏黄子宾程振民
Owner EAST CHINA UNIV OF SCI & TECH
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