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Method for optimizing the activity of phthalic anhydride catalyst

A technology of phthalic anhydride and catalyst, applied in the field of providing reactor systems, can solve problems such as rough description

Inactive Publication Date: 2014-07-16
CLARIANT INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if it takes a lot of time, it is possible to obtain only a very rough picture of the effect of individual parameters on the whole system

Method used

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  • Method for optimizing the activity of phthalic anhydride catalyst
  • Method for optimizing the activity of phthalic anhydride catalyst
  • Method for optimizing the activity of phthalic anhydride catalyst

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0293] According to a specific embodiment, the network comprises at least the following reaction pathways:

[0294] a) oxidation of o-xylene to carbon monoxide, carbon dioxide (2), tolualdehyde (1), or to 2,3-dimethylquinone (3);

[0295] b) oxidation of methylbenzaldehyde to phthalaldehyde (8), toluic acid (5), phthalide (4), or toluene (11);

[0296] c) oxidation of toluic acid to phthalide (6);

[0297] d) Oxidation of phthalaldehyde to phthalic acid (9)

[0298] e) Oxidation of toluene to benzaldehyde (19), 2-methyl-p-benzoquinone (12);

[0299] f) oxidation of benzaldehyde to benzoic acid (20);

[0300] g) oxidation of benzoic acid to benzene (21);

[0301] h) oxidation of benzene to phenol (22);

[0302] i) oxidation of phenol to hydroquinone (23);

[0303] j) oxidation of hydroquinone to benzoquinone (24);

[0304] k) oxidation of benzoquinone to maleic anhydride (25);

[0305] l) oxidation of 2-methyl-p-benzoquinone to maleic anhydride (14);

[0306] m) oxidat...

no. 1 Embodiment approach

[0317] According to a preferred first embodiment, the network comprises at least the following reaction pathways:

[0318] a) Oxidation of o-xylene to carbon monoxide, carbon dioxide (3) and tolualdehyde (1);

[0319] b) Oxidation of methylbenzaldehyde to maleic anhydride (6), phthalic anhydride (7) and phthalide (4);

[0320] c) oxidation of phthalide to phthalic anhydride (5); and

[0321] d) Oxidation of phthalic anhydride to carbon monoxide, carbon dioxide (10);

[0322] The network preferably only contains specified reaction paths.

[0323] The network is depicted in figure 2 middle.

[0324] If the catalyst phase consists of several layers, the first layer L 1 The network of is preferably formed by a network according to the first embodiment.

no. 2 Embodiment approach

[0325] According to a second particular embodiment, the network comprises at least the following reaction paths:

[0326] a) Oxidation of o-xylene to carbon monoxide, carbon dioxide (3) and tolualdehyde (1);

[0327] b) oxidation of tolualdehyde to maleic anhydride (6) and phthalide (4);

[0328] c) oxidation of phthalide to phthalic anhydride (5); and

[0329] d) Oxidation of phthalic anhydride to carbon monoxide, carbon dioxide (10).

[0330] The network according to the second embodiment preferably only contains specified reaction paths.

[0331] The network is depicted in image 3 middle.

[0332] If the catalyst phase consists of several layers L m , then the second layer L 2 The network preferably passes through the network according to the second specific embodiment ( image 3 )form.

[0333] According to a specific embodiment, the first layer L 1 Catalyst A 1，n Active Z provided 1，n Below second floor L 2 Catalyst A 2，n Active Z provided 2，n .

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Abstract

The present invention relates to a method of providing a reactor system, and the reactor system is used for the production of phthalic anhydride through vapor-phase oxidation of aromatic hydrocarbons at at least one catalyst made of a vanadium-containing material, wherein the catalyst activity is optimized by means of a model.

Description

technical field [0001] The present invention relates to a method for providing a reactor system for the production of phthalic anhydride by gas-phase oxidation of aromatic hydrocarbons over at least one catalyst made of vanadium-containing active material. Background technique [0002] The industrial scale production of phthalic anhydride is carried out by catalytic gas phase oxidation of o-xylene and / or naphthalene. For this purpose, a catalyst suitable for the reaction, generally a vanadium-containing contact, is provided in the reactor and the reaction gases are passed over the catalyst. Preferably, so-called multi-tubular reactors are used as reactors, in which a large number of tubes are arranged in parallel and around which the coolant flows. Generally, salt melts are used as coolants, e.g. NaNO 2 and KNO 3 eutectic mixture. [0003] The catalyst is loaded into the tubes in the form of catalyst bodies. In the simplest case, a homogeneous packed bed is used. A rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/89B01J27/198B01J27/199B01J8/06
CPCB01J8/06C07D307/89B01J23/22B01J27/198B01J35/613
Inventor 汉斯·耶格·沃尔克罗伯特·马克思格哈德·梅斯托托马斯·图雷克
Owner CLARIANT INT LTD