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Catalyst for preparing unsaturated acid from unsaturated aldehyde by oxidization and preparation method of catalyst

A technology for aldehyde oxidation production and acid catalyst, which is applied in catalyst activation/preparation, organic compound preparation, metal/metal oxide/metal hydroxide catalyst, etc. Problems such as low catalyst activity, to achieve uniform and easy preparation, improve reaction performance, and promote the effect of dissolution

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the catalysts used in the prior art are used in the oxidation of unsaturated aldehydes to unsaturated acids, which have the problems of low catalyst activity, unsaturated acid selectivity and insufficient yield. A new Catalysts for the oxidation of unsaturated aldehydes to unsaturated acids

Method used

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  • Catalyst for preparing unsaturated acid from unsaturated aldehyde by oxidization and preparation method of catalyst
  • Catalyst for preparing unsaturated acid from unsaturated aldehyde by oxidization and preparation method of catalyst
  • Catalyst for preparing unsaturated acid from unsaturated aldehyde by oxidization and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The catalyst was prepared according to the same process as in the comparative example, except that 20.5 grams of oxalic acid was added to the material C.

Embodiment 2～11

[0049] The catalyst was prepared according to the steps of Example 1, except that the preparation conditions of the catalyst were changed, and the type and amount of the reducing agent were added. The specific results are listed in Table 1. The results of the catalyst used in the oxidation of acrolein to acrylic acid are listed in Table 2. The catalyst used in The results of the oxidation of methacrolein to methacrylic acid are listed in Table 3.

[0050]

[0051] Table 2 Catalysts used in the oxidation reaction results of acrolein

[0052] Catalyst number

Acrylic acid yield (%)

Acrylic acid selectivity (%)

Acrolein conversion rate (%)

Comparative example 1

92.6

94.7

97.8

Example 1

96.4

98.9

97.5

Example 2

97.3

98.7

98.6

Example 3

97.7

98.5

99.2

Example 4

94.7

96.1

98.5

Example 5

93.9

97.0

96.8

Example 6

96.4

...

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Abstract

The invention relates to a catalyst for preparing an unsaturated acid from an unsaturated aldehyde by oxidization and a preparation method of the catalyst. The invention mainly solves the problems of low reaction yield and low selectivity of unsaturated acid in the catalyst in the prior art. The technical scheme is as follows: at least one of SiO2, Al2O3 and TiO2 is selected as a carrier; and the catalyst contains the active component illustrated by the general formula Mo12VaCubXcYdZeOx, wherein X is selected from at least one of W, Cr and Nb, Y is selected from at least one of Fe, Bi, Sb, Ce, La, Zr and Th, and Z is selected from at least one of alkali metals or alkaline earth metals. By using the technical scheme of the invention, the problems are solved. The catalyst can be used for industrially producing acrylic acid or methacrylic acid from acrolein or methacrolein by oxidization.

Description

technical field [0001] The invention relates to a catalyst for preparing unsaturated acid by oxidation of unsaturated aldehyde and its preparation method, in particular to a catalyst for preparation of acrylic acid or methacrylic acid by oxidation of acrolein or methacrolein and its preparation method. Background technique [0002] The selective oxidation of olefins to prepare α, β unsaturated aldehydes and unsaturated acids is an important chemical process. The production of unsaturated carboxylic acids from unsaturated aldehydes uses a catalyst containing Mo and V as active components. The improvement of the catalyst is mainly carried out from the aspects of the activity, selectivity and stability of the catalyst, such as adding transition metals to the active component to improve the activity and increase the yield of the product; adding rare earth elements to improve the oxidation-reduction ability and improve the stability of the catalyst ; Add Fe, Co, Ni and other elem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J23/887B01J37/16C07C51/235C07C57/055
Inventor 杨斌缪晓春郑育元汪国军吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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