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Catalyst for production of methacrylic acid and method for producing methacrylic acid using same

A technology of methacrylic acid and methacrolein, applied in the direction of catalyst activation/preparation, heterogeneous catalyst chemical elements, organic chemical methods, etc., can solve the problems of high hygroscopicity, catalyst performance degradation, and improve activity, etc., to achieve moisture absorption excellent effect

Active Publication Date: 2014-07-23
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is known to produce methacrylic acid by gas-phase catalytic oxidation of at least one selected from the group consisting of methacrolein, isobutyraldehyde and isobutyric acid using a molecular oxygen-containing gas in the presence of an oxidation catalyst composition The heteropolyacid-based catalyst used at the time has high hygroscopicity. Once the catalyst absorbs moisture, it is difficult to increase the activity again, although it also depends on the degree of moisture absorption. The performance of the catalyst is reduced, and when producing methacrylic acid, a satisfactory conversion rate and methacrylic acid selectivity cannot be obtained.
However, these known techniques can be said to be useful as a method for preventing moisture absorption of the catalyst for the production of methacrylic acid, but there is a problem that any process from the production of the catalyst to the use of the catalyst becomes cumbersome.
[0007] However, catalysts manufactured using such conventional catalyst raw material mixing methods and pH adjustment methods are not necessarily sufficient as industrial catalysts in terms of life, and further improvement in catalyst performance is desired.

Method used

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  • Catalyst for production of methacrylic acid and method for producing methacrylic acid using same
  • Catalyst for production of methacrylic acid and method for producing methacrylic acid using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] 1) Preparation of catalyst

[0070] 800 g of molybdenum trioxide, 40.43 g of vanadium pentoxide, and 73.67 g of 85% by mass orthophosphoric acid were added to 5680 ml of pure water, and heated and stirred at 92° C. for 3 hours to obtain a reddish-brown transparent solution. Next, the solution was cooled to 15-20° C., 307.9 g of a 9.1 mass % cesium hydroxide aqueous solution and 689.0 g of a 14.3 mass % ammonium acetate aqueous solution were slowly added while stirring, and aged at 15-20° C. for 1 hour to obtain Yellow paste. Next, 709.9 g of 6.3 mass % copper acetate aqueous solution was further slowly added to this slurry, and it aged at 15-20 degreeC for 30 minutes further. Next, this slurry was spray-dried to obtain granules. The composition of the obtained particles is Mo 10 V 0.8 P 1.15 Cu 0.4 Cs 0.3 (NH 4 ) 2.3 . 320 g of the pellets were calcined at 310° C. for 5 hours under air circulation to obtain precalcined pellets. The mass was reduced by about 4...

Embodiment 2

[0077] A coated catalyst was prepared in the same manner as in Example 1 except that the precalcination temperature was set to 290° C. in Example 1. The composition of the obtained catalyst is Mo 10 V 0.8 P 1.15 Cu 0.4 Cs 0.3 (NH 4 ) 2.3 Sb 1.0 . The methacrolein oxidation reaction and the moisture absorption measurement were carried out in the same manner as in Example 1 except that the coated catalyst was used. The results are shown in Table 1 and Table 2.

Embodiment 3

[0079] A coated catalyst was prepared in the same manner as in Example 1, except that 320 g of precalcined particles, 11.35 g of antimony trioxide, and 45 g of a strength improving agent (ceramic fiber) were uniformly mixed in Example 1. The composition of the obtained catalyst is Mo 10 V 0.8 P 1.15 Cu 0.4 Cs 0.3 (NH 4 ) 2.3 Sb 0.5 . In addition, at this time, α=1.1. The methacrolein oxidation reaction and the moisture absorption measurement were carried out in the same manner as in Example 1 except that the coated catalyst was used. The results are shown in Table 1 and Table 2.

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Abstract

Provided is a heteropolyacid catalyst for the production of a methacrylic acid, which has more excellent performance, service life and moisture absorption during storage. A catalyst for the production of a methacrylic acid, which is obtained by substituting protons in MoaPbVcCudYeZfOg (wherein Y represents cesium or the like, Z represents iron or the like, and a-g respectively represent atomic ratios of the constituent elements relative to 10 Mo atoms) so that A, B and C satisfy the following conditions: alpha = A + (B C) and 0.5 <= alpha <= 1.4, where A is the atomic ratio of alkali metal atoms relative to 10 Mo atoms, B is the atomic ratio of copper atoms relative to 10 Mo atoms and C is the valence of the copper atoms.

Description

technical field [0001] The present invention relates to the gas-phase catalytic oxidation of at least one selected from the group consisting of methacrolein, isobutyraldehyde and isobutyric acid using a gas containing molecular oxygen in the presence of an oxidation catalyst composition to produce methyl A heteropolyacid-based catalyst used in acrylic acid and a method for producing methacrylic acid using the same. Background technique [0002] Conventionally, catalysts composed of heteropolyacids or their salts have been known to be effective as catalysts used in the production of methacrylic acid by gas-phase catalytic oxidation of methacrolein or the like. and production methods, there are many reports (for example, about the micropores of the catalyst, it is described in Patent Document 1, about the molding method in catalyst production, it is described in Patent Document 2, and about the calcining method in catalyst production, it is described in Patent Document 3). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199C07C51/235C07C57/055C07B61/00
CPCB01J27/199C07C51/235C07C51/252B01J23/002B01J23/8877B01J2523/00C07C57/04B01J2523/15B01J2523/17B01J2523/44B01J2523/55B01J2523/68B01J2523/842B01J27/24B01J37/0215B01J37/08C07C51/16
Inventor 饭岛孝幸仓上龙彦西村英二江尻知幸酒井秀臣
Owner NIPPON KAYAKU CO LTD
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