Catalyst for selective oxidation of methacrolein to methacrylic acid, preparation method and use thereof

A technology of methacrylic acid and methacrolein, which is used in catalyst activation/preparation, organic compound preparation, physical/chemical process catalysts, etc., can solve the problems of high separation cost, many by-products, and high production cost, and can improve Preparation efficiency, high activity, and the effect of improving activity

A technology of methacrylic acid and methacrolein, which is used in catalyst activation/preparation, organic compound preparation, physical/chemical process catalysts, etc., can solve the problems of high separation cost, many by-products, and high production cost, and can improve Preparation efficiency, high activity, and the effect of improving activity

CN109731592BActive Publication Date: 2020-12-01INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Catalyst for selective oxidation of methacrolein to methacrylic acid, preparation method and use thereof
  • Catalyst for selective oxidation of methacrolein to methacrylic acid, preparation method and use thereof
  • Catalyst for selective oxidation of methacrolein to methacrylic acid, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The preparation method of catalyst comprises the following steps:

[0060] (1) Add 2643.5g of molybdenum oxide and 167.1g of vanadium oxide into 31kg of deionized water, dilute 233g of phosphoric acid (concentration is 85%) into phosphoric acid with a concentration of 15%, and slowly add the phosphoric acid solution to the solution containing molybdenum oxide In the solution of vanadium oxide and vanadium oxide, after the phosphoric acid is added, the temperature is raised to 100°C, and the stirring reaction is continued for 6 hours to obtain the first solution;

[0061] (2) Add 12.5 g of ammonium carbonate to the first solution, stir and react at 25° C. for 1 h to obtain the second solution, and then spray dry to obtain the first solid;

[0062] (3) Mix the first solid, 333.2g cesium nitrate, 4.9g sodium nitrate, 42.5g copper nitrate, 28.7g bismuth nitrate, 23.3g zirconia and 29.3g ammonium carbonate to obtain the second solid;

[0063] (4) adding the second solid int...

Embodiment 2

[0065] The difference between this embodiment and embodiment 1 is that the roasting atmosphere of step (4) is replaced by the mixed gas of air and nitrogen by air, and the concentration of oxygen in the described mixed gas is 13%, and other conditions are compared with embodiment 1 completely. same.

Embodiment 3

[0067] The difference between this embodiment and embodiment 1 is that the roasting atmosphere of step (4) is replaced by the mixed gas of air and nitrogen by air, and the concentration of oxygen in the described mixed gas is 5%, and other conditions are compared with embodiment 1 completely. same.

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Abstract

The invention discloses a catalyst for selectively oxidizing methacrylaldehyde to prepare methacrylic acid and preparation and application methods thereof. The catalyst for selectively oxidizing the methacrylaldehyde to prepare the methacrylic acid is composed of PaMobVcXxYyZz1HhOg1-Zz2Og2, wherein X is a combination of at least two from sodium, potassium, rubidium and cesium, Y is a mixture of one or at least two from calcium, magnesium, chromium, manganese, iron, cobalt, copper, nickel, zinc, aluminum, silicon, germanium, antimony, bismuth, lanthanum or cerium, and Z comprises titanium and / or zirconium. Compared with traditional phosphovanadomolybdate catalysts. The catalyst for selectively oxidizing the methacrylaldehyde to prepare the methacrylic acid can be higher in activity when applied to selectively oxidizing the methacrylaldehyde to prepare the methacrylic acid, and during the catalytic process, when the methacrylaldehyde converting rate is 90%, and the selectivity to the methacrylic acid can reach up to 93%, so that the catalyst for selectively oxidizing the methacrylaldehyde to prepare the methacrylic acid can meet the demands of practical industrial production.

Description

technical field [0001] The invention relates to the field of catalytic materials, in particular to a catalyst for preparing methacrylic acid through the selective oxidation of methacrolein, a preparation method and application thereof. Background technique [0002] In 1982, Japan Catalyst Chemical Corporation and Mitsubishi Rayon Corporation realized the industrialization of methyl methacrylate synthesis technology using isobutylene or tert-butanol as raw materials through two-step catalytic oxidation and one-step esterification. Among them, the oxidation of methacrolein to methacrylic acid is a key reaction of this process route, and the catalyst generally uses phosphomolybdic acid or phosphomolybdovanadate heteropolyacidate. [0003] CN1750878A discloses a catalyst for the gas-phase catalytic oxidation of methacrolein, isobutyraldehyde or isobutyric acid to prepare methacrylic acid and its preparation method and use. The catalyst uses heteropolyacid containing heteropolyac...

Claims

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Application Information

Patent Timeline
01 Dec 2020
Publication
CN109731592B
IPC
B01J27/188; B01J31/18; B01J37/08; C07C51/235; C07C57/055
Inventors
王蕾; 刘路