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Catalyst used for synthesis of p-tolualdehyde

A technology of p-tolualdehyde and catalyst, applied in organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, organic chemistry, etc., can solve the problem of low selectivity of tolualdehyde

Active Publication Date: 2018-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is the problem of low selectivity to p-tolualdehyde, and a new catalyst for the synthesis of p-tolualdehyde is provided, which has the characteristics of high selectivity to p-tolualdehyde

Method used

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  • Catalyst used for synthesis of p-tolualdehyde
  • Catalyst used for synthesis of p-tolualdehyde
  • Catalyst used for synthesis of p-tolualdehyde

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Experimental program
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Embodiment 1

[0040] Catalyst preparation: under nitrogen atmosphere, AlCl 3 (40.0 g, 0.3 mol) was slowly added to N,N-dimethyl imidazole chloride (26.2 g, 0.15 mol), stirred and reacted at 40° C. for 4 h to obtain the catalyst. Elemental analysis: theoretically calculated value C, 15.04; H, 2.27; N, 7.02. Experimental values ​​C, 15.07; H, 2.28; N, 7.01.

[0041] Carbonylation reaction: Add the above catalyst (79.9g, 0.2mol) and toluene (9.2g, 0.1mol) into a 250ml autoclave; replace the air in the kettle with CO gas; raise the temperature to 50°C, keep the reaction pressure at 4.0MPa, and stir at 800rpm , Reacted for 5h to obtain a product mixture containing p-tolualdehyde.

[0042] For the convenience of comparison and illustration, the composition parameters in the catalyst active components and the corresponding selectivity to p-tolualdehyde are listed in Table 1.

Embodiment 2

[0044] Catalyst preparation: under nitrogen atmosphere, RuCl3 (62.2g, 0.3mol) was slowly added into N,N-dimethyl imidazole chloride (26.2g, 0.15mol), stirred and reacted at 40°C for 4h to obtain the catalyst. Elemental analysis: theoretically calculated value C, 10.97; H, 1.66; N, 5.12. Experimental values ​​C, 10.95; H, 1.65; N, 5.13.

[0045] Carbonylation reaction: Add the above catalyst (109.5g, 0.2mol) and toluene (9.2g, 0.1mol) into a 250ml autoclave; replace the air in the kettle with CO gas; raise the temperature to 50°C, keep the reaction pressure at 4.0MPa, and stir at 800rpm , Reacted for 5h to obtain a product mixture containing p-tolualdehyde.

[0046] For the convenience of comparison and illustration, the composition parameters in the catalyst active components and the corresponding selectivity to p-tolualdehyde are listed in Table 1.

Embodiment 3

[0048] Catalyst preparation: under nitrogen atmosphere, PdCl 2 (53.2g, 0.3mol) was slowly added into N,N-dimethyl imidazole chloride (26.2g, 0.15mol), stirred and reacted at 40°C for 4h to obtain the catalyst. Elemental analysis: theoretically calculated value C, 12.33; H, 1.86; N, 5.75. Experimental values ​​C, 12.29; H, 1.86; N, 5.77.

[0049] Carbonylation reaction: Add the above catalyst (97.5g, 0.2mol) and toluene (9.2g, 0.1mol) into a 250ml autoclave; replace the air in the kettle with CO gas; raise the temperature to 50°C, keep the reaction pressure at 4.0MPa, and stir at 800rpm , Reacted for 5h to obtain a product mixture containing p-tolualdehyde.

[0050] For the convenience of comparison and illustration, the composition parameters in the catalyst active components and the corresponding selectivity to p-tolualdehyde are listed in Table 1.

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Abstract

The invention relates to a catalyst used for synthesis of p-tolualdehyde. The problem that p-tolualdehyde is low in selectivity in the prior art is mainly solved. The catalyst comprises an active component which is a compound shown in the following formula (in the description). In the formula, R1 and R2 are independently selected from C1-C10 alkyl, M is selected from at least one of Al or palladium-series metal, X and Y are independently selected from chlorine or bromine, a is the absolute value of the valence of M, and N is more than 1 and less than 5. The technical problem is solved. The catalyst can be used for industrial production of p-tolualdehyde.

Description

technical field [0001] The invention relates to a catalyst for the selective carbonylation of toluene and CO to synthesize p-tolualdehyde, a preparation method and a synthesis method of p-tolualdehyde. Background technique [0002] p-Tolualdehyde, namely 4-methylbenzaldehyde (p-Tolualdehyde, PTAL for short), is a colorless or pale yellow transparent liquid with a gentle floral and almond aroma, and is irritating to eyes and skin. P-tolualdehyde can be highly selectively oxidized to synthesize terephthalic acid, and it is also an important intermediate in organic synthesis, which is widely used in fine chemical and pharmaceutical fields. [0003] The synthesis methods of PTAL mainly include direct high temperature oxidation, indirect electrosynthesis and carbonylation. [0004] The direct high-temperature oxidation method uses p-xylene as a raw material to prepare PTAL through photobromination, alkaline hydrolysis, and oxidation of hydrogen peroxide / hydrobromic acid mixture....

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J31/30C07C45/50C07C47/542
CPCB01J31/0244B01J31/26B01J31/30C07C45/50C07C47/542
Inventor 王艳红肖忠斌杨运信查晓钟
Owner CHINA PETROLEUM & CHEM CORP
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