Method for oxidizing styrene

A technology of styrene and oxidants, applied in organic chemistry, ozone decomposition preparation, etc., can solve problems such as harsh operating conditions, environmental pollution, equipment corrosion, etc., achieve high selectivity, increase selectivity, and overcome complex production processes.

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

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Problems solved by technology

[0005] In order to overcome the above-mentioned problems that the method for oxidizing styrene in the prior art exists, the inventor of the present invention has carried out in-depth research and found that: adopting ozone to oxidize styrene as an oxidizing agent can overcome t

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  • Method for oxidizing styrene
  • Method for oxidizing styrene
  • Method for oxidizing styrene

Examples

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Embodiment 1

[0037] 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, styrene, 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 styrene is 23%; the effective utilization rate of ozone is 35%; the selectivity of phenylacetaldehyde is 56% and the selectivity of styrene oxide is 8%.

Embodiment 2

[0039] 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, styrene, ozone and solvent methanol were reacted in a molar ratio of 1:1:5. The results of the reaction for 2 hours are as follows: the conversion rate of styrene is 19%; the effective utilization rate of ozone is 42%; the selectivity of phenylacetaldehyde is 59% and the selectivity of styrene oxide is 16%.

Embodiment 3

[0041] 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, styrene, ozone and solvent acetonitrile 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 styrene is 37%; the effective utilization rate of ozone is 33%; the selectivity of phenylacetaldehyde is 47% and the selectivity of styrene oxide is 8%.

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Abstract

The invention discloses a method for oxidizing styrene. According to the method, the styrene comes into contact with an oxidant under the condition of oxidation reaction. The method is characterized in that the oxidant is an ozone-containing gas. According to the method, the phenylacetaldehyde selectivity is high, and the selectivity of styrene oxide is greatly improved in the presence of a titanium-containing catalyst.

Description

technical field [0001] The present invention relates to a method for oxidizing styrene, and more particularly relates to a method for oxidizing styrene with ozone as an oxidizing agent. Background technique [0002] Phenylacetaldehyde, also known as 1-oxo-2-phenylethane, is a colorless to pale yellow viscous oily liquid. It is easy to polymerize and thicken when placed at room temperature. Soluble in ethanol, ether, most fixed oils and propylene glycol, slightly soluble in water, insoluble in glycerin and mineral oil. It has strong hyacinth aroma, almond and cherry aroma at low concentration. Phenylacetaldehyde also has the elegant aroma of narcissus, and is one of the important spices used in blending various floral essences. At present, there are many ways to prepare phenylacetaldehyde: for example, the catalytic reduction of phenylacetic acid, the catalytic oxidation of β-phenylethanol, and the method of using styrene, styrene oxide, cinnamic acid and its esters as raw...

Claims

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Application Information

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IPC IPC(8): C07C47/228C07C45/40C07D303/04C07D301/03
Inventor 林民史春风朱斌汝迎春
Owner CHINA PETROLEUM & CHEM CORP
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