Catalysts for the ammoxidation of alkanes

An oxidation reaction and catalyst technology, which is applied in the field of catalysts for propane ammoxidation to acrylonitrile and isobutane ammoxidation to methacrylonitrile, can solve the problems of poor catalyst stability, complicated preparation process, and low yield. Achieve the effect of simple composition, good repeatability and easy access to raw materials

Active Publication Date: 2008-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • 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 problems of complex preparation process and low yield caused by reflux of Sb ...

Method used

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  • Catalysts for the ammoxidation of alkanes
  • Catalysts for the ammoxidation of alkanes
  • Catalysts for the ammoxidation of alkanes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]15.0 grams of ammonium heptamolybdate and 4.46 grams of telluric acid are dissolved in 69.2 grams of hot water to make solution (I); 3.06 grams of ammonium metavanadate are dissolved in 60.0 grams of hot water to make solution (II); 5.78 grams of niobium oxalate was dissolved in 16.0 grams of hot water to make solution (III); 1 ml of 98% concentrated sulfuric acid was dissolved in 9 grams of water to make solution (IV). Solution (I) is added in the solution (II) under stirring, then add solution (III) and solution (IV) successively, the pH value of mixed solution is 1, finally add 50 grams of weight concentration and be 40% silica sol, Prepare the catalyst slurry, stir and evaporate the slurry at 90°C until a viscous slurry is obtained, then dry, grind, and bake in a nitrogen atmosphere at 600°C for 2 hours to obtain the propane ammoxidation catalyst Mo 1 V 0.31 Nb 0.22 Te 0.23 o x +50% SiO2 2 After tableting, 20-40 meshes were taken for fixed-bed microreflective ev...

Embodiment 2～6 and comparative example 2～3

[0048] 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.

[0049] The reaction conditions of above-mentioned embodiment and comparative example are:

[0050] Fixed bed reactor with an inner diameter of 8 mm

[0051] Reaction temperature 405°C

[0052] Reaction pressure Atmospheric pressure

[0053] Catalyst loading 2.0 grams

[0054] Catalyst contact time 1.2 g·s / ml

[0055] Raw material ratio (mole) propane / ammonia / air=1 / 1.2 / 10

[0056] Table 1

[0057]

Embodiment 6

[0058] The stability evaluation result of embodiment 6 and comparative example 1 is shown in table 2

[0059] Table 2

[0060]

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Abstract

The invention relates to a catalyst for alkane ammoxidation, which mainly aims at solving the problems of bad stability of the catalyst caused by that stibium requires circumfluence and Te is easy to volatilize in the prior art. Carrier containing silicon dioxide and atomic ratio are adopted to calculate the composition of general formula as MoVaNbbTecDdOx, wherein, D is at least one kind, which is selected from Sn, Ti, Fe, Bi, Sb or W; the preparation environment is changed by adjusting pH value by adding with acid in the process of preparation. Firstly the corresponding salt or oxide of Mo and Te is dissolved, then the solution of the corresponding salt or oxide of V and Nb is respectively added and acid with required amount is added for adjusting the pH value of the mixed solution, and at last silicasol with the required amount is added for preparing the catalyst. The technical proposal better solves the problems. The catalyst of the invention has the advantages of excellent stability of oxidation and reduction, low reaction temperature, clean reaction product and being capable of keeping higher yield for a long time, thus being suitable for preparing unsaturated nitriles with alkane ammoxidation in industrial production.

Description

technical field [0001] The invention relates to a catalyst for alkane ammoxidation, in particular to a catalyst for producing acrylonitrile by ammoxidation of propane and methacrylonitrile 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 efficient process for the ammo...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/30C07C255/08C07C253/24
CPCY02P20/52
Inventor 张顺海汪国军缪晓春吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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