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Process for preparing benzaldehyde and benzoic acid by methylbenzene gas-solid phase catalytic oxidation and micro reactor

A catalytic oxidation and micro-channel reactor technology, applied in the field of petrochemical product synthesis, can solve problems such as the increase in selectivity of benzaldehyde, and achieve the effects of improving the utilization rate of raw materials, high safety, and improving selectivity

Inactive Publication Date: 2007-04-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Huang Yuzeng et al. (Molecular Catalysis, 1996, 10:289) found that V 2 o 5 / TiO 2 The activity of the system was inhibited after introducing Sb, but the selectivity of benzaldehyde was improved

Method used

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  • Process for preparing benzaldehyde and benzoic acid by methylbenzene gas-solid phase catalytic oxidation and micro reactor
  • Process for preparing benzaldehyde and benzoic acid by methylbenzene gas-solid phase catalytic oxidation and micro reactor
  • Process for preparing benzaldehyde and benzoic acid by methylbenzene gas-solid phase catalytic oxidation and micro reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] 1, embodiment a and comparative example b, c, d, e

[0038] Table 1 illustrates the advantages of the method described in the present invention compared to other methods.

[0039] example

Embodiment a

[0040] Embodiment a: Catalyst is the V / TiO that has added Ag promoter 2 Catalyst, the reaction is carried out in the microreactor shown in Figure 1, the catalyst is not diluted, and pure oxygen is used as the oxidant.

Embodiment 1--7

[0047] The selected V / TiO with silver as auxiliary agent in the present invention 2 The catalyst has higher reactivity and product selectivity at the same time, and is the most economical and efficient.

[0048] Table 2 has listed operating conditions and reaction performance and characteristics of the present invention. The catalyst is the particularly preferred AgV / TiO 2 , V 2 o 5 The supported amount was 5.0 wt%, and the Ag / V atomic ratio was 0.5.

[0049] Example

temperature

o 2 / toluene

Airspeed

X

BAc

BA

℃

h -1

％

1

2

3

4

5

6

7

360

360

360

360

330

380

360

3.6

3.6

1.68

8.03

3.86

3.86

3.86

15870

47589

31000

31000

31000

31000

31000

27.0

14.4

11.7

23.7

7.7

36.2

19.3

44.4

36.8

38.1

29.1

28.3

25.7

37.3

29.2

41.9...

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PUM

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Abstract

The present invention discloses gas-solid phase catalysis process of toluene to prepare benzaladehyde (BA) and benzoic acid (BAc) and the micro rector therefor. The micro rector includes upper cover, heating rod, sealing graphite diaphragm, reaction plate, lower cover, inlet and outlet. Under the gas-solid phase catalysis of the Ag modified granular V / TiO2 catalyst filled inside the micro channel, toluene is oxidized selectively with pure oxygen as the oxidant to prepare BA and BAc in lowered mass transfer and heat transfer resistance, no formation of hot point, reduced deep oxidation and raised oxidation product selectivity. The present invention has high safety, capacity of operating within explosion range, high conversion rate, high material utilizing rate and other advantages.

Description

technical field [0001] The invention belongs to the field of synthesis of petrochemical products, and relates to the use of micro-reaction and catalytic technology. A method for selectively catalytically oxidizing toluene into benzaldehyde and benzoic acid by filling silver-modified titanium dioxide-supported vanadium-based catalysts in a microchannel reactor manufactured by microprocessing technology. Background technique [0002] Benzaldehyde (BA) and benzoic acid (BAc) are important chemical product intermediates, which are widely used in food, medicine, chemical industry and other fields. Currently, they are mainly produced by liquid-phase catalytic oxidation of toluene. Liquid-phase oxidation has many by-products, difficult separation, serious corrosion, complex process and other problems. The gas-phase oxidation of toluene to prepare benzaldehyde and benzoic acid has the advantages of single raw material and easy separation of products, but it has not been industriali...

Claims

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Application Information

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IPC IPC(8): C07C27/12C07C47/54C07C57/30B01J8/06B01J23/648B01J21/06
Inventor 陈光文葛皓袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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