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Catalyst and preparation method thereof as well as method for preparing methylacrolein with catalyst

A technology of methacrolein and catalyst is applied in the preparation of carbon-based compounds, chemical instruments and methods, preparation of organic compounds, etc., to achieve high selectivity.

Active Publication Date: 2011-10-12
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that in the current patent reports, in the reaction of isobutene to MAL, the selectivity is mostly between 85% and 90%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Under the condition of 50°C, put 400g of ammonium heptamolybdate and 20g of ammonium metavanadate into 500ml of deionized water, and dissolve them completely to obtain solution A. 300g of bismuth nitrate, 100g of cobalt nitrate, 280g of iron nitrate, 20g of cesium carbonate, and 20g of copper nitrate were dropped into 425g of dilute nitric acid (15wt%) aqueous solution, and solution B was obtained after complete dissolution. Keep the solution temperature at 65°C, add B to A while stirring, and then adjust pH=3 with ammonia water. After adjustment, stir and mature for 5-6 hours, evaporate to dryness at 110°C, grind and roast at 450°C for 4 hours. The active catalyst is obtained, and the catalyst particles of 30-60 meshes are obtained by pressing into tablets.

[0038] 5g of the molded catalyst was loaded into the fixed bed reactor, and the flow rate was 100ml min -1 In an air atmosphere, the temperature ranges from room temperature to 5°C min -1 The heating rate is hea...

Embodiment 2

[0040] Under the condition of 50°C, 400g of ammonium heptamolybdate and 21g of niobium oxalate were put into 500ml of deionized water, and solution A was obtained after completely dissolving. 150g of bismuth nitrate, 230g of cobalt nitrate, 140g of iron nitrate, 17g of cesium carbonate, and 5g of copper nitrate were dropped into 425g of dilute nitric acid (15wt%) aqueous solution and completely dissolved to obtain solution B. Keep the solution temperature at 65°C, add B to A while stirring, and then adjust pH=3 with ammonia water. After adjustment, stir and mature for 5-6 hours, evaporate to dryness at 110°C, grind and roast at 450°C for 4 hours. The active catalyst is obtained, and the catalyst particles of 30-60 meshes are obtained by pressing into tablets.

[0041] Using the same reaction process as in Example 1, the conversion rate of isobutylene was 95%, the selectivity of methacrolein was 85%, and the selectivity of methacrylic acid was 0.4%.

Embodiment 3

[0043] Under the condition of 50°C, put 400g of ammonium heptamolybdate and 20g of ammonium metavanadate into 500ml of deionized water, and dissolve them completely to obtain solution A. 300g of bismuth nitrate, 100g of cobalt nitrate, 2800g of iron nitrate, 23g of cesium carbonate, and 25g of copper nitrate were dropped into 425g of dilute nitric acid (15wt%) aqueous solution, and solution B was obtained after complete dissolution. Keep the solution temperature at 65°C, add B to A while stirring, and then adjust pH=3 with ammonia water. After adjustment, stir and mature for 5-6 hours, evaporate to dryness at 110°C, grind and roast at 450°C for 4 hours. The active catalyst is obtained, and the catalyst particles of 30-60 meshes are obtained by pressing into tablets.

[0044] Using the same reaction process as in Example 1, the conversion rate of isobutylene was 97%, the selectivity of methacrolein was 90%, and the selectivity of methacrylic acid was 0.3%.

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PUM

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Abstract

The invention discloses a catalyst for preparing methylacrolein, a preparation method thereof as well as a method for preparing methylacrolein by catalyzing tert butyl alcohol or isobutene with the catalyst. The catalyst comprises a composite metal oxide which is expressed by the following general formula: (Mo12BiaFebCocCudCseVfNbiWjPbk): n carriers. The catalyst disclosed by the invention has the characteristics of high activity, high methylacrolein selectivity, high yield and the like. Finally, the conversion rate of the tert butyl alcohol or isobutene can be bigger than 95%, the methylacrolein selectivity can be bigger than 90%, and the single period yield of the methylacrolein can exceed 90%. The catalyst has the advantages of simple preparation technology and low production cost and is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to a catalyst for preparing methacrolein and a preparation method thereof, and a method for preparing methacrolein (MAL) by catalytic reaction using the catalyst with tert-butanol or isobutene as a raw material and oxygen as an oxidant. Background technique [0002] Methyl methacrylate (MMA) is an important organic chemical raw material. The current industrial methods for preparing MMA include acetone cyanohydrin method, isobutylene oxidation method, and ethylene carbonylation method. The raw materials of the acetone cyanohydrin method are hydrocyanic acid and acetone. The raw material hydrocyanic acid of this method is highly toxic, and strong corrosive sulfuric acid is used in the reaction process. 47%. The ethylene carbonylation method is not yet available in China due to the shortage of domestic ethylene supply and the difficulty in transportation and storage of ethylene. The isobutene oxidation method uses tert-butanol or i...

Claims

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Application Information

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IPC IPC(8): B01J23/887C07C47/22C07C45/35C07C45/37
Inventor 万毅楼银川邵亮峰吴训锟刘林华卫琦
Owner WANHUA CHEM GRP CO LTD
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