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Replenishment catalyst for maintaining stabilization production of acrylonitrile device

A stable production and catalyst technology, applied in the production of bulk chemicals, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as decline and loss of molybdenum activity, and achieve good technical results , the effect of maintaining stable production

Active Publication Date: 2015-04-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of decreased activity due to the loss of molybdenum in the use of catalysts in the prior art, and a new supplementary catalyst for maintaining stable production of acrylonitrile devices is provided

Method used

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  • Replenishment catalyst for maintaining stabilization production of acrylonitrile device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1.4 grams of sodium hydroxide and 3.6 grams of potassium hydroxide and 11 grams of water were added and dissolved after heating to obtain material (A); 846.0 grams of ammonium molybdate was dissolved in 800 grams of 60-90°C hot water to obtain material (B); Mix 111.1 grams of bismuth nitrate, 124.8 grams of manganese nitrate, 517.6 grams of nickel nitrate, 287.6 grams of iron nitrate, 135.5 grams of magnesium nitrate, add 340 grams of water, heat and dissolve as material (C), weigh 60.7 grams of praseodymium nitrate and 21.4 grams of nitric acid Chromium, add 15 grams of water, obtain material (D).

[0048] Mix the material (A) with 2500 grams of silica sol with a weight concentration of 40%, add the materials (B), (C) and (D) in turn under stirring, and obtain a slurry after thorough stirring, and make it according to the usual method The slurry is formed into microspheres in a spray dryer, and finally the inner diameter is 89 mm, and the length is 1700 mm (φ89 × 1700 ...

Embodiment 2～6 and comparative example 1～4

[0052] Using the same method as in Example 1 to prepare additional catalysts with different compositions in the following table, and use the prepared catalyst to perform the ammoxidation of propylene to acrylonitrile under the following reaction conditions. The results are shown in Table 1.

[0053] The reaction conditions of above-mentioned embodiment and comparative example are:

[0054] φ38mm fluidized bed reactor

[0055] Reaction temperature 430-440°C

[0056] Reaction pressure 0.084MPa

[0057] Catalyst loading 400 grams

[0058] Catalyst propylene loading (WWH) 0.085 hours -1

[0059] Raw material ratio (mole) C 3 = / NH 3 / air=1 / 1.25 / 9.7

[0060] Table 1

[0061]

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Abstract

The invention relates to a replenishment catalyst for maintaining stabilization production of an acrylonitrile device, and mainly solves the problem in the prior art that in use processes of catalysts the activity is reduced due to loss of molybdenum. A technical scheme is used to well solve the problem, and the technical scheme is as follows: the replenishment catalyst comprises molybdenum oxide and a composition 1, wherein the composition 1 contains carrier silica and a composition having the following general formula: in atomic ratio, A[a]B[b]C[c]Bi[d]Mo[13.6]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, P and Nb; and C is at least one selected from rare earth elements. The replenishment catalyst can be used in the industrial production of maintaining stabilization production of the acrylonitrile device.

Description

technical field [0001] The invention relates to an additional catalyst for maintaining stable production of an acrylonitrile device. 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. At present, the single yield of fresh catalyst acrylonitrile can reach more than 80%. After a long time of use in industrial equipment, the catalyst activity will gradually decrease. Generally, after two years of use, the single yield of catalyst a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/887B01J27/192C07C253/18C07C255/08
CPCY02P20/52
Inventor 张顺海吴粮华姜家乐
Owner CHINA PETROLEUM & CHEM CORP