Method for preparing methylacrolein and co-producing methacrylonitrile by oxidizing isobutene

A technology of methacrolein and methacrylonitrile, applied in the direction of hydrocarbon ammoxidation preparation, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of methacrylonitrile strength, achieve co-production, solve strong Response heat problem, effect of improving selectivity

Pending Publication Date: 2022-06-07
北京水木滨华科技有限公司
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  • Application Information

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Problems solved by technology

How to solve the problem of strong heat of reaction in the preparation of methacrylonitrile by the direct ammoxidation of isobutylene in the prior art has become a technical problem to be solved urgently

Method used

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  • Method for preparing methylacrolein and co-producing methacrylonitrile by oxidizing isobutene
  • Method for preparing methylacrolein and co-producing methacrylonitrile by oxidizing isobutene
  • Method for preparing methylacrolein and co-producing methacrylonitrile by oxidizing isobutene

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preparation example Construction

[0061] The preparation process of the catalyst used in the following embodiment is as follows:

[0062] 31.8g ammonium heptamolybdate was added to 60mL deionized water, and then 20mL of ammonia water was added, at this time the solution was clarified, 18.16g 30wt% silica sol was added under mechanical stirring, and the above mixture was placed in an 80 ° C water bath pot. 1.51g of potassium nitrate solution with a mass fraction of 10%, 17.44g of nickel nitrate hexahydrate, 7.7g of magnesium nitrate hexahydrate, 15.17g of iron nitrate hexahydrate, 1.82g of bismuth pentahydrate, 4.47g of zinc nitrate hexahydrate, 10.88g of copper trihydrate nitrate dissolved in 30g of deionized water and then added 1g of citric acid, stirred to dissolve, and slowly added to the ammonium heptamolybdate solution. After that, continue stirring for 2 hours, transfer the mixture to a 110 °C oven and dry overnight. The dried catalyst is ground, placed in a muffle furnace, in an air atmosphere, at a heatin...

Embodiment 1-4

[0065] The 10g catalyst was loaded into a reaction tube with an inner diameter of 16mm in a fixed-bed reactor, and isobutene, air, and water were introduced into the reaction tube, isobutene: air: water = 5: 47: 0.01 (unit mL / min), the reaction conditions were 370-430 °C, atmospheric pressure, and methacrylaldehyde was prepared.

Embodiment 5-8

[0067] Example 1, 2, 3, 4 prepared to obtain methacryl, to the reaction tube and then into the ammonia, methacrylal: ammonia: air: water = 5: 6: 47: 0.01 (unit mL / min), the reaction conditions are 370-430 °C, atmospheric pressure, preparation of methacrylonitrile.

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Abstract

The invention discloses a method for preparing methylacrolein and co-producing methacrylonitrile through oxidation of isobutene. Comprising the following steps: 1) mixing isobutene and an oxidizing agent, mixing with a catalyst, and reacting to prepare methylacrolein; and 2) mixing methylacrolein, ammonia, an oxidizing agent and a catalyst, and reacting to prepare the methacrylonitrile. Wherein the catalysts in the step 1) and the step 2) are the same. By controlling the same catalyst and reaction conditions, methylacrolein or methacrylonitrile can be selectively obtained on the same reactor; or further, isobutene can be oxidized into methylacrolein through a mode of connecting reaction tubes in series, and then methylacrolein is subjected to ammoxidation to obtain methacrylonitrile. The problem of strong reaction heat caused by direct ammoxidation of isobutene into methacrylonitrile can be effectively solved, the selectivity of methacrylonitrile is improved, and co-production of methylacrolein and methacrylonitrile can be realized.

Description

Technical field [0001] The present invention belongs to the field of methacryl and methacrylonitrile preparation, specifically relates to an isobutene oxidation of the preparation of methacrylaldehyde, and a method of co-production of methacrylonitrile. Background [0002] The catalysts for the production of methacryl and methacrylonitrile in isobutylene are mainly Mo catalysts, of which methacrylal is mainly used as an intermediate of methyl methacrylate. The important intermediate in the preparation of methacrylonitrile of isobutene is also methacrylaldehyde, and there is a strong heat of reaction in the preparation of methacrylonitrile by direct ammonia oxidation of isobutene in the prior art. How to solve the problem of direct ammonia oxidation of isobutene in the existing technology to prepare methacrylonitrile strong reaction heat has become an urgent technical problem to be solved. Contents of the Invention [0003] The present invention provides a method for the oxidatio...

Claims

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Application Information

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IPC IPC(8): C07C45/35C07C47/22C07C253/26C07C255/08B01J23/887
CPCB01J23/8876B01J23/002C07C45/35C07C253/26B01J2523/00C07C47/22C07C255/08B01J2523/13B01J2523/22B01J2523/27B01J2523/54B01J2523/56B01J2523/68B01J2523/842B01J2523/847B01J2523/3737B01J2523/845B01J2523/25B01J2523/3712B01J2523/17Y02P20/52
Inventor 杨盼盼戚伟杰宋立明郑虓
Owner 北京水木滨华科技有限公司
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