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Catalyst for ammonia oxidation, method for producing the same, and method for producing acrylonitrile

A manufacturing method and catalyst technology, which is applied in the field of acrylonitrile manufacturing, can solve the problems of large solid balls, etc., and achieve the effects of high abrasion resistance strength, compressive strength, and high acrylonitrile yield

Active Publication Date: 2020-06-30
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although Patent Document 1 does not describe cross-sectional observation, it is also considered that, except for particles with abnormalities such as openings and wrinkles on the surface, the particles are more likely to be solid spheres.

Method used

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  • Catalyst for ammonia oxidation, method for producing the same, and method for producing acrylonitrile
  • Catalyst for ammonia oxidation, method for producing the same, and method for producing acrylonitrile
  • Catalyst for ammonia oxidation, method for producing the same, and method for producing acrylonitrile

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preparation example Construction

[0070] The raw material of each component used in the preparation of the precursor slurry is preferably a salt soluble in water or nitric acid. The raw materials for the elements of molybdenum, bismuth, and iron are not particularly limited, and examples include ammonium salts, nitrates, hydrochlorides, sulfates, organic acid salts, and inorganic salts that are soluble in water or nitric acid. In particular, ammonium salts are preferred as the raw material of molybdenum. In addition, as the raw materials of bismuth and iron, respective nitrates are preferred. In addition to being easy to handle, nitrate is also preferable in that it does not cause residual chlorine generated when hydrochloride is used, and residual sulfur generated when sulfate is used. Specific examples of the raw materials of each component include ammonium paramolybdate, bismuth nitrate, and iron nitrate.

[0071] The temperature of the precursor slurry is preferably 20 to 60°C.

[0072] The silica raw materi...

Embodiment 1

[0092] Follow the steps below to make the composition of the metal component Mo 12.00 Bi 0.37 Fe 1.42 Co 4.47 Ni 3.30 Ce 0.91 Rb 0.14 The shown 60% by mass composite metal oxide is supported on 40% by mass of the catalyst particles made of silica.

[0093] In a 650-liter container with a stirring device, the content of 30% by mass SiO 2 Add 2.85kg of oxalic acid dihydrate dissolved in 32.81kg of water to 152.17kg of silica sol, and add ammonium paramolybdate dissolved in 107.73kg of water with stirring [(NH 4 ) 6 Mo 7 O 24 ·4H 2 O] 54.69 kg to obtain a first solution containing molybdenum and silica, and the liquid temperature was adjusted to 45°C.

[0094] Next, 4.70 kg of bismuth nitrate [Bi(NO 3 ) 3 · 5H 2 O], 14.71kg iron nitrate [Fe(NO 3 ) 3 ·9H 2 O], 33.90kg cobalt nitrate [Co(NO 3 ) 2 · 6H 2 O], 24.97kg nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O], 10.14kg cerium nitrate [Ce(NO 3 ) 3 · 6H 2 O], 0.54kg rubidium nitrate [RbNO 3 ] To obtain a second solution, and the liquid temperature w...

Embodiment 2

[0100] A catalyst in which 60% by mass of composite metal oxide having the same composition as in Example 1 was supported on a carrier composed of 40% by mass was produced by the following procedure.

[0101] In a 650-liter container with a stirrer, it contains 30% by mass of SiO 2 Add 2.68kg of oxalic acid dihydrate dissolved in 30.76kg of water to 142.67kg of silica sol, and add ammonium paramolybdate dissolved in 132.00kg of water with stirring [(NH 4 ) 6 Mo 7 O 24 ·4H 2 O] 51.28 kg to obtain a first solution containing molybdenum and silica, and the liquid temperature was adjusted to 45°C.

[0102] Next, 4.41 kg of bismuth nitrate [Bi(NO 3 ) 3 · 5H 2 O], 13.80kg iron nitrate [Fe(NO 3 ) 3 ·9H 2 O], 31.78kg cobalt nitrate [Co(NO 3 ) 2 · 6H 2 O], 23.41kg nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O], 9.51kg cerium nitrate [Ce(NO 3 ) 3 ·6H 2 O], 0.51kg rubidium nitrate [RbNO 3 ] To obtain a second solution, and the liquid temperature was adjusted to 40°C.

[0103] The second solution is mixed ...

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Abstract

The catalyst for ammonia oxidation of the present invention has catalyst particles containing molybdenum, bismuth, and iron, and has a hollow particle ratio of 23% or less. In addition, the method for producing a catalyst for ammoxidation includes: the process of preparing a catalyst precursor slurry containing molybdenum, bismuth and iron, and having a solid content concentration of 30% by mass or less; The process of spray drying the catalyst precursor slurry to obtain dry particles; and the process of calcining the dry particles at 500-750°C.

Description

Technical field [0001] The present invention relates to a catalyst for ammonia oxidation, a method for producing the same, and a method for producing acrylonitrile. Background technique [0002] The reaction for producing acrylonitrile by reacting propylene and ammonia in the presence of molecular oxygen is known as "ammoxidation reaction". Now, this reaction is used as the main industrial production method of acrylonitrile. The ammoxidation reaction can also be used for the reaction of producing methacrylonitrile by reacting isobutylene with ammonia. [0003] In the ammoxidation reaction, a catalyst is used in order to achieve a good yield of acrylonitrile. For example, many catalysts formed of particles containing composite metal oxides containing Mo-Bi-Fe or Fe-Sb as essential components have been proposed, which are used industrially. In order to use the catalyst stably for a long time in a fluidized bed reactor, in addition to the size distribution and shape of the catalyst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J37/00C07C253/26C07C255/08C07B61/00
CPCB01J23/887B01J37/00C07B61/00C07C253/26C07C255/08B01J2523/00B01J21/08B01J37/0045B01J35/60Y02P20/52B01J2523/14B01J2523/3712B01J2523/54B01J2523/68B01J2523/842B01J2523/845B01J2523/847B01J23/8876
Inventor 友田笃志福泽章喜
Owner ASAHI KASEI KK