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Method used for preparing catalysts for ammoxidation of alkanes

An oxidation reaction and catalyst technology, applied in the direction of hydrocarbon ammoxidation preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. low, unstable preparation environment, etc., to achieve excellent redox stability, simple preparation process, and mild reaction conditions

Active Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is to overcome the complex preparation process, unstable preparation environment, and the unsaturation of the prepared catalyst when used in the alkane ammoxidation reaction in the catalyst preparation process in the prior art, such as the presence of Sb corresponding salts or oxides that must be refluxed. The problem of low nitrile yield and volatile catalyst active components provides a new method for preparing alkane ammoxidation catalysts

Method used

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  • Method used for preparing catalysts for ammoxidation of alkanes
  • Method used for preparing catalysts for ammoxidation of alkanes
  • Method used for preparing catalysts for ammoxidation of alkanes

Examples

Experimental program
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Embodiment 1

[0042] Dissolve 2.95 grams of ammonium metavanadate in 60.8 grams of hot water to make solution (I); dissolve 16.8 grams of oxalic acid in 84.0 grams of water to make solution (II); dissolve 13.67 grams of ammonium metatungstate in 41.0 grams In hot water, make solution (III); 3 ml of 30% H 2 o 2 Dissolve in 30 g of water to make solution (IV). Add solution (I) to solution (II) under stirring, then add solution (III), then add 11.2 grams of antimony trioxide to it, finally add solution (IV) and 7.2 grams of 70.8% hydrated oxide Aluminum, the water suspension of the catalyst was prepared, and the suspension was stirred and evaporated at 90°C until a viscous slurry was obtained, then dried, ground, and calcined in air at 600°C for 1 hour to obtain the propane ammoxidation catalyst VSb 3 Al 4 W 2 o x , After tableting, take 20-40 meshes for fixed bed micro-reaction evaluation.

Embodiment 2～6 and comparative example 2～3

[0046] Catalysts with different compositions in the following table were prepared by the same method as in Example 1, and the ammoxidation of propane to acrylonitrile was carried out under the following reaction conditions with the prepared catalyst. See Table 1 for specific changes and results.

[0047] The reaction conditions of above-mentioned embodiment and comparative example are:

[0048] Fixed bed reactor with an inner diameter of 8 mm

[0049] Reaction temperature 480°C

[0050] Reaction pressure Atmospheric pressure

[0051] Catalyst loading 2.6 grams

[0052] Catalyst contact time 1.5 g·s / ml

[0053] Raw material ratio (mole) propane / ammonia / air=1 / 1.2 / 10

[0054] Example

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Abstract

The invention relates to a method for preparing a catalyst for alkane ammoxidation reaction, which mainly solves the problem of complex preparation process such as Sb beard reflux in the existing technology, unstable preparation environment, low yield of unsaturated nitrile, and volatile active components of the catalyst. Problem, the present invention adopts V-Sb-Al base as the main composition of the catalyst, utilizes the reduction oxidation method, changes the preparation environment by adding reducing agent and oxidizing agent in the preparation process, that is, first reduces V to below +5 valence with reducing agent , then add the corresponding help metal salt or oxide solution, then directly add the corresponding salt or oxide of Sb to the above solution under stirring, and finally add the technical scheme of oxidant oxidation and corresponding amount of Al salt or oxide. The problem is solved, and it can be used in the industrial production of alkane ammoxidation to prepare unsaturated nitrile.

Description

technical field [0001] The invention relates to a method for preparing alkane ammoxidation reaction catalyst. In particular, the method for preparing acrylonitrile by propane ammoxidation and methacrylonitrile catalyst by ammoxidation of isobutane. Background technique [0002] Although most of the production of acrylonitrile currently adopts the propylene ammoxidation process of BP / Sohio, with the changes in the petrochemical market and the in-depth research on the selective oxidation of alkanes, due to the price difference between propane and propylene or the price of isobutane and isobutene The process route of producing acrylonitrile by propane ammoxidation or isobutane ammoxidation to methacrylonitrile has been paid more and more attention. [0003] In order to obtain a catalyst with high activity and high selectivity for the ammoxidation of propane to acrylonitrile, people have made a series of improvements through continuous exploration. Early attempts to develop an...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/16C07C255/08C07C253/24
CPCY02P20/52
Inventor 张顺海汪国军吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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