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Catalyst and method for preparing unsaturated nitrile fluidized bed by ammoxidation

A nitrile fluidized bed and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, hydrocarbon ammoxidation preparation, chemical instruments and methods, etc., can solve the problem of low specific surface, low yield of acrylonitrile, propylene Problems such as low nitrile selectivity

Active Publication Date: 2015-10-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that in the prior art, the acrylonitrile catalyst has low oxygen storage and oxygen release ability, low specific surface area, and is easy to sinter at the reaction temperature, resulting in low propylene conversion rate and low acrylonitrile selectivity , and a rapid decline, leading to the problem of low yield of acrylonitrile, providing a new fluidized bed catalyst for ammoxidation of unsaturated nitrile

Method used

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  • Catalyst and method for preparing unsaturated nitrile fluidized bed by ammoxidation

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Embodiment 1～15

[0054] According to the same preparation process as Comparative Example 1, the catalyst was prepared according to the catalyst composition in Table 1, the only difference being that the rare earth elements were first added through ammonia water co-precipitation, drying, roasting and grinding to a size below 20 microns. The catalysts were inspected according to the above evaluation conditions, and the activity evaluation results, catalyst oxygen storage, oxygen release and specific surface analysis results are shown in Table 2.

[0055] Table 1

[0056] Catalyst composition Comparative example 1 Mo 12 Bi 2.0 Fe 2.5 Ni 4.5 Mg 1.8 La 0.8 SM 0.2 K 0.05 Cs 0.05 Na 0.05 +50%SiO2 2 Example 1 Mo 12 Bi 2.0 Fe 2.5 Ni 4.5 Mg 1.8 La 0.8 SM 0.2 K 0.05 Cs 0.05 Na 0.05 +50%SiO 2 Example 2 Mo 12 Bi 0.5 Fe 1.9 Ni 5.8 Mg 2.3 La 0.3 Nd 0.2 K 0.1 Rb 0.08 +46%SiO2 2 Example 3 Mo 12 Bi 0.2 Fe 2.0...

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Abstract

The invention relates to a fluidized bed catalyst used for preparing unsaturated nitrile through ammoxidation and a method of the fluidized bed catalyst, and mainly solves the problems in the prior art that the propylene is low in conversion rate, the acrylonitrile is low in selectivity and drops rapidly resulting low yield of acrylonitrile, all of which are caused by the fact that the acrylonitrile catalyst is poor in oxygen storage and oxygen release, is low in specific surface, and is susceptible to sintering under the reaction temperature. According to the invention, silica sol is adopted as a carrier, and comprises an active component represented by the following general formula: Mo12BiaFebNicXdYeZfKgOx, wherein the Y is a catalyst prepared after two or more rare-earth elements form a solid solution, and the problems in the prior art are well solved by the technical scheme of the method. The fluidized bed catalyst can be applied to the industrial production of acrylonitrile through the ammoxidation of propylene.

Description

technical field [0001] The invention relates to a fluidized bed catalyst and method for preparing unsaturated nitrile by ammoxidation. Background technique [0002] The ammoxidation of olefins to prepare α and β unsaturated nitriles was developed by BP in the 1960s. The core technology of this process is to use a catalyst whose active components contain Mo and Bi. After continuous improvement, the Mo-Bi series catalyst is very mature at present, and the process of preparing acrylonitrile by ammoxidation of propylene has been widely used in industry. In the past, the improvement of catalysts was mainly carried out from the aspects of catalyst activity and stability through the design of catalyst formulations, such as adding transition metals to active components to improve activity and increase product yield; adding rare earth elements to improve redox ability; adding Add elements such as Na and P to improve the wear resistance of the catalyst; add elements such as Fe, Co an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J23/889C07C253/26C07C255/08
CPCY02P20/52
Inventor 吴粮华姜家乐张顺海
Owner CHINA PETROLEUM & CHEM CORP