Catalyst for methacrylic acid production, coated catalyst, and process for producing the same

A technology of methacrylic acid and coating catalyst, which is applied in catalyst activation/preparation, chemical elements of heterogeneous catalysts, chemical instruments and methods, etc. Problems such as coating inactive carriers with difficult catalytically active materials

Inactive Publication Date: 2003-12-10
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (1) It is difficult to obtain a catalyst with high mechanical strength, because the coating is easy to peel off or crack
[0012] (2) It is difficult to coat inactive supports with a large amount of catalytically active materials
[0013] (3) The inclusion of inactive materials makes it difficult to obtain highly active catalysts
[0014] Due to the diversity of catalytically active materials, there is no general technique to solve such problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0084] (1) Preparation of catalyst

[0085] 300g of molybdenum trioxide, 11.37g of vanadium pentoxide, 3.31g of copper oxide, 8.32g of copper acetate monohydrate, 28.32g of 85% phosphorous acid and 24.64g of arsenic acid are dispersed or dissolved in 1900ml of pure water, and then stirred at 95-100 It was heated to reflux at °C for about 6 hours to obtain a reddish-brown transparent solution.

[0086] Antimony trioxide (1.52 g) was added to the above solution, and then heated to reflux at 95-100° C. for about 3 hours to obtain a dark blue solution.

[0087] Then, the solution was dried by a spray dryer to obtain catalyst particles. Catalyst particles (319g) were mixed with 44.7g of ceramic fibers to obtain powder, which was then gradually sprayed onto 300g of spherical porous alumina carriers in a rotating drum under the condition of dripping 90% aqueous ethanol solution, to use catalyst Particle coated spherical supports. Little loss of powder was observed during the proce...

Embodiment A2

[0097] 300g of molybdenum trioxide, 24.64g of vanadium pentoxide, 8.32g of copper acetate monohydrate, 26.42g of 85% phosphorous acid and 9.22g of rubidium nitrate are dispersed or dissolved in 1900ml of pure water, then stirred and heated to reflux at 95-100°C for about 9 hours to obtain a reddish-brown clear solution.

[0098] Then, the solution was dried by a spray dryer to obtain catalyst particles.

[0099] Subsequent steps were the same as in Example A1 to obtain a coated catalyst. The coated catalyst has Mo 10 V 1.3 P 1.1 Cu 0.2 Rb 0.3 active ingredient composition.

[0100] The coated catalyst thus obtained was used in the same reaction as in Example A1. The conversion of methacrolein was 74.2%, and the selectivity of methacrylic acid was 79.0%. Comparative example 2

Embodiment A3

[0106] The coated catalyst was prepared using the same procedure as in Example A1, except that 3.59 g of cerium oxide was used instead of antimony trioxide.

[0107] The resulting coated catalyst has Mo 10 V 0.6 P 1.2 Cu 0.4 As 0.5 Ce 0.1 active ingredient composition.

[0108] The coated catalyst thus obtained was used in the same reaction as in Example A1. The conversion rate of methacrolein was 85.2%, and the selectivity of methacrylic acid was 84.0%.

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Abstract

A catalyst for producing methacrylic acid from methacrolein through vapor-phase catalytic oxidation which comprises as essential active ingredients molybdenum, vanadium, phosphorus, and copper, characterized by being one obtained using copper acetate as all or part of the copper material necessary for the catalyst preparation. By using the catalyst, methacrolein can be reacted at a high conversion and methacrylic acid can be produced with high selectivity. The catalyst is usable also in reactions under high-load conditions.

Description

technical field [0001] The present invention relates to a catalyst for producing methacrylic acid through gas-phase catalytic oxidation of methacrolein, said catalyst having long service life, high activity and high selectivity; and a method for producing the catalyst. Background technique [0002] For the production of methacrylic acid by gas-phase catalytic oxidation of methacrolein, many catalysts have been proposed, most of which contain molybdenum and phosphorus as main components and have a structure of a heteropolyacid and / or a salt thereof. However, they have low reactivity, low selectivity for the target material and short lifetime compared to molybdenum-vanadium catalysts proposed for the production of acrylic acid by oxidation of acrolein, which is known to be similar to the gas-phase catalytic oxidation of methacrolein. Although some of the proposed catalysts have been commercialized, there is still a need to improve catalytic stability. [0003] The inventors o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199B01J37/00B01J37/02C07C51/25
CPCB01J37/0223B01J37/0236B01J37/0018B01J27/199C07C51/252B01J23/002B01J2523/00B01J37/0045C07C57/04B01J2523/17B01J2523/51B01J2523/52B01J2523/55B01J2523/68B01J2523/69B01J2523/15B01J2523/3712B01J2523/53B01J2523/842B01J2523/32B01J2523/13B01J2523/27B01J2523/31B01J2523/21B01J2523/43B01J2523/845B01J2523/14B01J2523/305B01J2523/42B01J2523/54
Inventor 濑尾纯将须藤渥椙秀树
Owner NIPPON KAYAKU CO LTD
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