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Catalyst for prepn. of m-dimethyl amino benzoic acid

A technology of m-dimethylaminobenzene and catalyst, which is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of unstable catalyst reaction activity and product yield. And the purity is not ideal and other problems, to achieve good economic benefits, improve reaction stability, reduce production costs.

Inactive Publication Date: 2003-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings that the service life of the m-dimethylaminobenzoic acid catalyst or the unstable reactivity of the catalyst and the obtained product yield and purity are not ideal enough in the previous documents, and provide a preparation method The catalyst of dimethylaminobenzoic acid, the catalyst has the characteristics of good and stable catalytic activity and long service life, and the yield and purity of the prepared m-dimethylaminobenzoic acid product are improved compared with the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0024] Catalysts were prepared under the same conditions as in Example 1, except that the types and weight percentages of the catalyst components were changed to prepare catalysts B, C, D, and E respectively. The catalyst composition is shown in Table 1.

[0025] Example

[0026] Catalysts A, B, C, D, and E prepared in Examples 1 to 2 are used in m-nitrobenzoic acid reduction-alkylation under different reaction conditions to prepare m-dimethylaminobenzoic acid, wherein the m-nitrobenzoic acid is fixed Benzoic acid amount 0.1 mole, catalyst consumption, acetic acid amount are based on 0.1 mole (16.7 grams) m-nitrobenzoic acid, and other reaction process conditions are listed in Table 2, and concrete reaction process is as follows:

[0027] With 0.1 mole (16.7 grams) m-nitrobenzoic acid (chemically pure), methyl alcohol (chemically pure), acetic acid (chemically pure) and catalyzer, add in the autoclave, feed the air in the nitrogen displacement reactor 2 times, then F...

Embodiment 1

[0030] Catalyst A life test prepared in Example 1.

[0031]Catalyst A is used for the reaction of preparing m-dimethylaminobenzoic acid, wherein 0.1 mole of m-nitrobenzoic acid is fixed, and acetic acid and catalyst consumption are based on 0.1 mole (16.7 grams) m-nitrobenzoic acid, and the amount of acetic acid is 1%, specifically The reaction process is the same as in Example 3, and other different process conditions and product yields are shown in Table 4. After the first reaction finishes, the catalyst is filtered out for the next reaction; or for intermittent and continuous reactions, catalyst A is preserved in methanol solution In , the catalyst was filtered out when it was used again, and it was directly put into the reactor for use without regeneration treatment. Catalyst A was recycled 50 times in total.

[0032] Catalyst heavy

[0033] It can be seen from the reaction results in Table 4 that after the catalyst A was recycled 50 times, it still showed good r...

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PUM

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Abstract

The composition of catalyst for preparing m-dimethylaminobenzoic acid includes (wt%) 55-80% of active carbon carrier, 1-10% and one selected from Pd, Pt and Ph or their mixture anjd 15-40% of one selected from Fe, Co, Ni, Cu and Zn or their mixture. Said catalyst features good and stable catalytic activity and long service life, at the same time the yield and purity of said m-dimethylaminobenzoicacid product are raised, and said product can be used in industrial production.

Description

technical field [0001] The invention relates to a catalyst for preparing m-dimethylaminobenzoic acid. Background technique [0002] m-Dimethylaminobenzoic acid is an important organic intermediate, which can be used in the synthesis of pesticides and pharmaceutical intermediates, intermediates in the synthesis of liquid crystal materials, dyes, pigments, pigments and photosensitive materials, such as synthetic heat-sensitive dye anti-counterfeiting marks, color-changing coatings , pressure-sensitive dye carbonless copy paper, etc., these materials play an extremely important role in the field of information materials. Because m-dimethylaminobenzoic acid has a wide range of uses, its preparation and production have received widespread attention and attention. In the prior art, there are many methods for synthesizing m-dimethylaminobenzoic acid, and the catalysts used are also different, such as the synthesis process using m-bromoaniline or m-ni...

Claims

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Application Information

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IPC IPC(8): B01J23/74B01J23/89
Inventor 乔建江张卫东陈永福张磊
Owner CHINA PETROLEUM & CHEM CORP