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Low-temperature high-load catalyst for olefin ammoxidation reaction

An oxidation reaction and catalyst technology, applied in the preparation of hydrocarbon ammoxidation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of low yield of acrylonitrile, etc., to promote the conversion of propylene , has strength and fluidity, and reduces the effect of deep oxidation by-products

Inactive Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the low yield of acrylonitrile under low temperature and high load conditions in the prior art, and a new low temperature and high load catalyst for olefin ammoxidation is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1.5 grams of sodium hydroxide and 3.8 grams of potassium hydroxide and 11 grams of water were added and dissolved after heating to obtain material (A); 789.0 grams of ammonium molybdate was dissolved in 800 grams of hot water at 60 to 90°C to obtain material (B); Mix 153.6 grams of bismuth nitrate, 132.0 grams of manganese nitrate, 547.2 grams of nickel nitrate, 304.1 grams of iron nitrate, 143.3 grams of magnesium nitrate, add 340 grams of water, heat and dissolve as material (C), weigh 64.2 grams of praseodymium nitrate and 22.6 grams of nitric acid Chromium, add 15 grams of water, obtain material (D).

[0052] Mix the material (A) with 2500 grams of 15 centipoise silica sol with a weight concentration of 40%, and add the materials (B), (C) and (D) in turn under stirring, and obtain a slurry after fully stirring. The prepared slurry is carried out into microspheres in a spray dryer, and finally the inner diameter is 89 millimeters, and the length is 1700 millimeters (...

Embodiment 2～6 and comparative example 1～4

[0055] Catalysts with different compositions in the following table were prepared by the same method as in Example 1, and the ammoxidation of propylene to acrylonitrile was carried out with the prepared catalyst under the following reaction conditions. The results are shown in Table 1.

[0056] The reaction conditions of above-mentioned embodiment and comparative example are:

[0057] φ38mm fluidized bed reactor

[0058] Reaction temperature 400-430°C

[0059] Reaction pressure 0.084MPa

[0060] Catalyst loading 400 grams

[0061] Catalyst propylene loading (WWH) 0.085 hours -1

[0062] Raw material ratio (mole) C 3 = / NH 3 / air=1 / 1.25 / 9.7

[0063] Table 1

[0064]

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PUM

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Abstract

The invention relates to a low-temperature high-load catalyst for an olefin ammoxidation reaction, and mainly solves the problem of the low yield of acrylonitrile under conditions of low temperature and high load in the prior art. Through use of a technical scheme, the problem is well solved. The technical scheme is shown as follows: the catalyst comprises a silicon dioxide carrier and a composition, the composition is represented by the following general formula: by atomic ratio, A[a]B[b]C[c]Bi[d]Mo[12]O[x], wherein A is at least one selected from the group consisting of Li, Na, K, Rb and Cs, B is at least one selected from the group consisting of Ca, Mn, Fe, Co, Ni, Mg, Cr, W, Nb, Ge and Ba, C is at least one selected from rare earth elements, and the silicon dioxide carrier is selected from silica sol with the viscosity of 5-25 centipoise. The low-temperature high-load catalyst can be used in industrial production for preparing the acrylonitrile by the olefin ammoxidation reaction.

Description

technical field [0001] The invention relates to a low-temperature high-load catalyst for olefin ammoxidation reaction. Background technique [0002] Acrylonitrile is an important organic chemical raw material, which is produced by ammoxidation of propylene. In order to obtain a fluidized bed catalyst with high activity and high selectivity, people have made a series of improvements through continuous exploration. Most of these improvements involve the active composition of the catalyst, focusing on the combination of the active components of the catalyst to improve the activity and selectivity of the catalyst, thereby achieving an increase in the single-pass yield of acrylonitrile and an increase in production load. [0003] After more than 40 years of development in the production of acrylonitrile by ammoxidation, the production capacity of the factory and the market demand are close to balance. At present, the main development trend of acrylonitrile production is to buil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/883C07C253/26C07C255/08
CPCY02P20/52
Inventor 张顺海姜家乐吴粮华
Owner CHINA PETROLEUM & CHEM CORP