Toluene oxidation method

A toluene and oxidant technology, which is applied in the fields of ozone oxidation to prepare carboxylic acid, hydrocarbon oxidation to prepare oxygenated compounds, organic chemistry, etc., can solve the problems of equipment corrosion, environmental pollution, harsh operating conditions, etc. Improve the effect of simple and easy-to-control process

Active Publication Date: 2013-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the above-mentioned problems in the prior art toluene oxidation method, the inventors of the present invention have carried out in-depth research and found that: using ozone as an oxidant to oxidize toluene can overcome the harsh operating conditions and serious equipment corrosion in the prior art on the one hand. And pollute the defect of environment, and can also obtain the selectivity of satisfactory benzaldehyde and benzoic acid, thus completed the present invention

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Examples

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Embodiment 1

[0039] At a temperature of 60° C. and a pressure of 0.5 MPa, with ozone (15% by volume, the rest being oxygen) as an oxidant, toluene, ozone and solvent acetone were reacted in a molar ratio of 1:1:1. The results of the reaction for 2 hours are as follows: the conversion rate of toluene is 21%; the effective utilization rate of ozone is 36%; the selectivity of benzaldehyde is 44%; the selectivity of benzoic acid is 23%.

Embodiment 2

[0040] Embodiment 2 (no solvent)

[0041] At a temperature of 20° C. and a pressure of 1.5 MPa, with ozone (30% by volume, the rest being air) as an oxidant, toluene and ozone were reacted at a molar ratio of 1:5. The results of the reaction for 5 hours are as follows: the conversion rate of toluene is 12%; the effective utilization rate of ozone is 38%; the selectivity of benzaldehyde is 39%; the selectivity of benzoic acid is 20%.

Embodiment 3

[0043] At a temperature of 80° C. and a pressure of 0.2 MPa, with ozone (5% by volume, the rest being oxygen) as an oxidant, toluene, ozone and solvent butanone were reacted in a molar ratio of 1:2:10. The results of the reaction for 2 hours are as follows: the conversion rate of toluene is 42%; the effective utilization rate of ozone is 33%; the selectivity of benzaldehyde is 40%; the selectivity of benzoic acid is 25%.

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Abstract

The invention discloses a toluene oxidation method. The method comprises a step of letting toluene make contact with an oxidizing agent under an oxidation reaction condition, and the method is characterized in that the oxidizing agent is a gas containing ozone. According to the invention, the total selectivity of benzaldehyde and benzoic acid is high, and the selectivity of benzaldehyde is improved in the presence of a catalyst containing titanium.

Description

technical field [0001] The present invention relates to a method for oxidizing toluene, and more particularly relates to a method for oxidizing toluene with ozone as an oxidant. Background technique [0002] Benzaldehyde is an important chemical raw material, which is an organic compound formed after the hydrogen of benzene is replaced by an aldehyde group. Benzaldehyde is the simplest and most commonly used aromatic aldehyde in industry. It is a colorless liquid at room temperature with a characteristic almond smell and was once called bitter almond oil. Benzaldehyde is widely found in the plant kingdom, especially in Rosaceae plants, such as amygdalin in bitter almonds. Benzaldehyde occurs naturally in essential oils such as bitter almond oil, ageratum oil, hyacinth oil, and ylang ylang oil. Benzaldehyde is also an important raw material for medicine, dyes, spices and resin industries. It is mainly used in the manufacture of lauric aldehyde, lauric acid, magenta, etc. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/16C07C47/54C07C45/40C07C63/06C07C51/34
Inventor 林民史春风朱斌
Owner CHINA PETROLEUM & CHEM CORP
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