Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 the harsh operating conditions of the prior art on the one hand, The defects of serious corrosion of equipment and polluted environment, and satisfactory styrene conversion rate and effective utilization rate of oxidant can also be obtained, thus completing the present invention

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for oxidizing styrene
  • Method for oxidizing styrene
  • Method for oxidizing styrene

Examples

Experimental program
Comparison scheme
Effect test

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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C47/228C07C45/40C07D303/04C07D301/03
Inventor 林民史春风朱斌汝迎春
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com