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Method 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 oxidation-reduction stability, good oxidation-reduction reaction, and mild reaction conditions

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

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to overcome the complex preparation process such as Sb corresponding salt or oxide must be refluxed in the catalyst preparation process in the prior art, the preparation environment is unstable, and when the prepared catalyst is used for the alkane ammoxidation reaction, it will not The problem of low yield of saturated nitrile and easy volatilization of catalyst active components provides a new preparation method for alkane ammoxidation catalyst

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0040]Dissolve 4.09 g of ammonium metavanadate in 84.2 g of hot water, and dissolve 9.48 g of ammonium metatungstate in 28.4 g of hot water, mix the two to make solution (I); add 6 ml of nitric acid to 24 g of water , Make solution (II); add 15.5 grams of antimony trioxide to solution (I) under stirring, then add 5.0 grams of hydrated alumina containing 70.8%, and finally add solution (II) to adjust the pH to 1. An aqueous suspension of the catalyst is prepared. The suspension is stirred and evaporated at 90°C to obtain a viscous slurry, then dried, ground, and calcined in the air at 600°C for 1 hour to obtain the propane ammoxidation catalyst VSb. 3 Al 2 WO x , After pressing the tablet, take 20-40 mesh for fixed bed micro-reverse evaluation.

Embodiment 2～6 and comparative example 2～3

[0044] The catalysts with different compositions in the following table were prepared by basically the same method as in Example 1, and the prepared catalyst was used to carry out the reaction of propane ammoxidation to acrylonitrile under the following reaction conditions. The specific changes and results are shown in Table 1.

[0045] The reaction conditions of the above examples and comparative examples are:

[0046] Fixed bed reactor with an inner diameter of 8 mm

[0047] Reaction temperature 480℃

[0048] Reaction pressure atmospheric pressure

[0049] Catalyst loading 2.6g

[0050] Catalyst contact time 1.5 g·sec / ml

[0051] Raw material ratio (mole) propane / ammonia / air=1 / 1.2 / 10

[0052] Example

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Abstract

The present invention relates to a catalyst preparation method used for an alkane ammoxidation and mainly solves the problems in the prior art that the preparation technology is complex, such as Sb has to reflow etc; the preparation environment is not stable; an unsaturated nitrile yield is not high, and an active components of the catalyst is easy to valatilized. The present invention solves the problems well by a technical proposal that V-Sb-Al base is adopted as the main component; acid is added during the process of preparation to change the preparation environment and adjust the pH value, that is firstly V and relevant auxiliary metal salt or oxide are made into the solution, then relevant salt or oxide of Sb is directly added into the above solution in stirring, and the relevant quantity of salt or oxide of Al is added, and finally the acid solution is added to adjust the pH value to be 1 to 5. The present invention can be used for the industrial production of the alkane ammoxidation for producing the unsaturated nitrile.

Description

Technical field [0001] The invention relates to a method for preparing a catalyst for ammoxidation of alkanes. In particular, the preparation method of the catalyst for the ammoxidation of propane to acrylonitrile and the ammoxidation of isobutane to methacrylonitrile. Background technique [0002] Although most of the current acrylonitrile production uses BP / Sohio's propylene ammoxidation process, 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 difference, the process route of ammoxidation of propane to acrylonitrile or ammoxidation of isobutane to methacrylonitrile has received increasing attention. [0003] In order to obtain high activity and high selectivity propane ammoxidation to acrylonitrile catalyst, people have made a series of improvements after continuous exploration. Early attempts were made to develop an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/16C07C255/08C07C253/24
CPCY02P20/52
Inventor 张顺海缪晓春汪国军吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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